124-524: Bakau is a town on the Atlantic coast of Gambia , west of Gambia's capital city of Banjul . It is known for its botanical gardens , its crocodile pool Bakau Kachikally and for the beaches at Cape Point . Bakau is the first major suburb outside Banjul and the most developed town in the Gambia. Close to Bakau and Banjul is Gambia's largest city, Serekunda . Legend has it that Bakau grew up around
248-492: A World Heritage Site for their geological value, four of them are considered of "Outstanding Universal Value" based on their cultural and natural criteria: Þingvellir , Iceland; Landscape of the Pico Island Vineyard Culture , Portugal; Gough and Inaccessible Islands , United Kingdom; and Brazilian Atlantic Islands: Fernando de Noronha and Atol das Rocas Reserves, Brazil. Continental shelves in
372-506: A Navy Sonic Depth Finder to draw a continuous map across the bed of the Atlantic. This involved little guesswork because the idea of sonar is straightforward with pulses being sent from the vessel, which bounce off the ocean floor, then return to the vessel. The deep ocean floor is thought to be fairly flat with occasional deeps, abyssal plains , trenches , seamounts , basins , plateaus , canyons , and some guyots . Various shelves along
496-721: A branch of the Gulf Stream which flows northward from the Grand Banks ; and the Subpolar Front , an extension of the North Atlantic Current, a wide, vaguely defined region separating the subtropical gyre from the subpolar gyre. This system of currents transports warm water into the North Atlantic, without which temperatures in the North Atlantic and Europe would plunge dramatically. North of
620-558: A letter to the Vatican dated 1 November 1493, the historian Peter Martyr described Columbus as the discoverer of a Novi Orbis (" New Globe "). The pope issued four bulls (the first three of which are collectively known as the Bulls of Donation ), to determine how Spain and Portugal would colonize and divide the spoils of the new lands. Inter caetera , issued 4 May 1493, divided the world outside Europe between Spain and Portugal along
744-461: A much smaller village within the old village called Bakau Wasulung Kunda, indicating the migrant origins of its inhabitants. As people began to move out of Banjul , government allocated residential areas quickly sprang around the old village, acquiring new names in the process. What were farms of the local population became well planned suburbs filled with bungalows, such as Fajara , New Town, Cape Point, Mile7 and Farrowkono (formerly used as gardens by
868-444: A mutiny by sailors who wanted to abandon the search and return to Spain. On the next day, they saw several artefacts floating up the sea, which caused them to believe that land was nearby. Columbus changed the fleet's course to due west, and sailed through the night, with many sailors looking for land. At around 10:00 pm on 11 October, Columbus thought he saw a light "like a little wax candle rising and falling". Four hours later, land
992-506: A north–south meridian 100 leagues west of either the Azores or Cape Verde Islands in the mid-Atlantic, thus granting Spain all the land discovered by Columbus. The 1494 Treaty of Tordesillas , ratified in the next decade by Pope Julius II , moved the dividing line to 370 leagues west of the Azores or Cape Verde. The stated purpose of the second voyage was to convert the indigenous Americans to Christianity. Before Columbus left Spain, he
1116-514: A plan to travel to the Indies (then construed roughly as all of southern and eastern Asia) by sailing directly west across what was believed to be the singular "Ocean Sea," the Atlantic Ocean . By about 1481, Florentine cosmographer Paolo dal Pozzo Toscanelli sent Columbus a map depicting such a route, with no intermediary landmass other than the mythical island of Antillia . In 1484 on
1240-593: A presence in North America for hundreds of years, but contacts between their North American settlements and Europe had all but ceased by the early 15th century. Until the mid-15th century, Europe enjoyed a safe land passage to China and India —sources of valued goods such as silk , spices , and opiates —under the hegemony of the Mongol Empire (the Pax Mongolica , or Mongol Peace). With
1364-503: A sensation: Hispaniola is a miracle. Mountains and hills, plains and pastures, are both fertile and beautiful ... the harbors are unbelievably good and there are many wide rivers of which the majority contain gold. ... There are many spices, and great mines of gold and other metals... Upon Columbus's return, most people initially accepted that he had reached the East Indies, including the sovereigns and Pope Alexander VI , though in
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#17327649323661488-707: A ship named Pinta probably identical to that from the first expedition. In addition, the expedition saw the construction of the first ship in the Americas, the Santa Cruz or India . On 3 November 1493, Christopher Columbus landed on a rugged shore on an island that he named Dominica . On the same day, he landed at Marie-Galante , which he named Santa María la Galante . After sailing past Les Saintes ( Todos los Santos ), he arrived at Guadeloupe ( Santa María de Guadalupe ), which he explored between 4 November and 10 November 1493. The exact course of his voyage through
1612-641: A shorter route to the Orient , Columbus and his crew took three medium-sized ships, the largest of which was a carrack (Spanish: nao ), the Santa María , which was owned and captained by Juan de la Cosa , and under Columbus's direct command. The other two were smaller caravels ; the name of one is lost, but it is known by the Castilian nickname Pinta ("painted one"). The other, the Santa Clara ,
1736-491: A still safer place to land, so the Niña moved once again. At this spot, Columbus took aboard several islanders with food. When told of the vow to Our Lady, the islanders directed the crew to a small shrine nearby. Columbus sent half of the crew to the island to fulfil their vow, but he and the rest stayed on the Niña , planning to send the other half later. While the shore party were in prayer, they were taken prisoner by order of
1860-577: A travel distance of 2,400 nautical miles was about four times too low (which was accurate). In 1486, Columbus was granted an audience with the Catholic Monarchs, and he presented his plans to Isabella. She referred these to a committee, which determined that Columbus had grossly underestimated the distance to Asia. Pronouncing the idea impractical, they advised the monarchs not to support the proposed venture. To keep Columbus from taking his ideas elsewhere, and perhaps to keep their options open,
1984-416: A weak Intertropical Convergence Zone , South Atlantic tropical cyclones are rare. The Atlantic Ocean is underlain mostly by dense mafic oceanic crust made up of basalt and gabbro and overlain by fine clay, silt and siliceous ooze on the abyssal plain. The continental margins and continental shelf mark lower density, but greater thickness felsic continental rock that is often much older than that of
2108-621: Is a complex of four water masses, two that form by deep convection in the open ocean – classical and upper Labrador sea water – and two that form from the inflow of dense water across the Greenland-Iceland-Scotland sill – Denmark Strait and Iceland-Scotland overflow water. Along its path across Earth the composition of the NADW is affected by other water masses, especially Antarctic bottom water and Mediterranean overflow water. The NADW
2232-401: Is also another major business activity and there is a fishing port by the town beach, together with a wharf where a market attracts many visitors. One of the few ice plants in the country is located there. Gardening is also another major business activity in which the local women are mostly engaged on for livelihood. The town has many shops, selling different types of products and services along
2356-467: Is fed by a flow of warm shallow water into the northern North Atlantic which is responsible for the anomalous warm climate in Europe. Changes in the formation of NADW have been linked to global climate changes in the past. Since human-made substances were introduced into the environment, the path of the NADW can be traced throughout its course by measuring tritium and radiocarbon from nuclear weapon tests in
2480-498: Is found off the eastern coast of Canada. Surface water temperatures, which vary with latitude, current systems, and season and reflect the latitudinal distribution of solar energy, range from below −2 °C (28 °F) to over 30 °C (86 °F). Maximum temperatures occur north of the equator, and minimum values are found in the polar regions. In the middle latitudes, the area of maximum temperature variations, values may vary by 7–8 °C (13–14 °F). From October to June
2604-575: Is interrupted by larger transform faults at two places: the Romanche Trench near the Equator and the Gibbs fracture zone at 53°N . The MAR is a barrier for bottom water, but at these two transform faults deep water currents can pass from one side to the other. The MAR rises 2–3 km (1.2–1.9 mi) above the surrounding ocean floor and its rift valley is the divergent boundary between
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#17327649323662728-801: Is intersected by two perpendicular ridges: the Azores–Gibraltar Transform Fault , the boundary between the Nubian and Eurasian plates , intersects the MAR at the Azores triple junction , on either side of the Azores microplate, near the 40°N . A much vaguer, nameless boundary, between the North American and South American plates, intersects the MAR near or just north of the Fifteen-Twenty fracture zone , approximately at 16°N . In
2852-461: Is located here. The national broadcaster, Radio Gambia , is located in Bakau at its Mile 7 studios. UN country headquarters is also located here with different foreign embassies. There is also a large military camp, a police barracks and a fire brigade. 13°29′N 16°41′W / 13.483°N 16.683°W / 13.483; -16.683 Atlantic Ocean The Atlantic Ocean
2976-729: Is now northern and central Brazil. The formation of the Central American Isthmus closed the Central American Seaway at the end of the Pliocene 2.8 Ma ago. The formation of the isthmus resulted in the migration and extinction of many land-living animals, known as the Great American Interchange , but the closure of the seaway resulted in a "Great American Schism" as it affected ocean currents, salinity, and temperatures in both
3100-794: Is now the Carpathian region, that were similar to the Sargasso Sea. It is possible that the population in the Sargasso Sea migrated to the Atlantic as the Tethys closed at the end of the Miocene around 17 Ma. The origin of the Sargasso fauna and flora remained enigmatic for centuries. The fossils found in the Carpathians in the mid-20th century often called the "quasi-Sargasso assemblage", finally showed that this assemblage originated in
3224-690: Is the second-largest of the world's five oceanic divisions , with an area of about 85,133,000 km (32,870,000 sq mi). It covers approximately 17% of Earth's surface and about 24% of its water surface area. During the Age of Discovery , it was known for separating the New World of the Americas ( North America and South America ) from the Old World of Afro-Eurasia ( Africa , Asia , and Europe ). Through its separation of Afro-Eurasia from
3348-472: The Age of Discovery , the Atlantic was also known to English cartographers as the Great Western Ocean . The pond is a term often used by British and American speakers in reference to the northern Atlantic Ocean, as a form of meiosis , or ironic understatement. It is used mostly when referring to events or circumstances "on this side of the pond" or "on the other side of the pond" or "across
3472-564: The Carpathian Basin from where it migrated over Sicily to the central Atlantic where it evolved into modern species of the Sargasso Sea. The location of the spawning ground for European eels remained unknown for decades . In the early 19th century it was discovered that the southern Sargasso Sea is the spawning ground for both the European and American eel and that the former migrate more than 5,000 km (3,100 mi) and
3596-687: The Fall of Constantinople to the Turkish Ottoman Empire in 1453, European countries sought to compete with the Silk Road dominated by the gunpowder empires through expanded use of ocean voyages to scope out and establish new trade routes. Portugal was the main European power interested in pursuing trade routes overseas, with the neighboring kingdom of Castile —the predecessor to Spain —having been somewhat slower to begin exploring
3720-543: The Greater Antilles , first sighting the eastern coast of the island of Puerto Rico , known to its native Taino people as Borinquen , on the afternoon of 17 November 1493. The fleet sailed along the island’s southern coast for a whole day, before making landfall on its northwestern coast at the Bay of Añasco , between the towns of Mayagüez and Aguadilla , early on 19 November 1493. Upon landing, Columbus christened
3844-474: The Icelandic Low produces frequent storms. Icebergs are common from early February to the end of July across the shipping lanes near the Grand Banks of Newfoundland . The ice season is longer in the polar regions, but there is little shipping in those areas. Hurricanes are a hazard in the western parts of the North Atlantic during the summer and autumn. Due to a consistently strong wind shear and
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3968-587: The Italian mile (about 1,480 meters). Alfraganus had calculated the length of a degree to be 56⅔ Arabic miles (66.2 nautical miles). Columbus therefore estimated the size of the Earth to be about 75% of Eratosthenes's calculation, and the distance from the Canary Islands to Japan as 2,400 nautical miles (about 23% of the real figure). There was a further element of key importance in the voyages of Columbus,
4092-535: The Lesser Antilles is debated, but it seems likely that he turned north, sighting and naming many islands including Santa María de Montserrat ( Montserrat ), Santa María la Antigua ( Antigua ), Santa María la Redonda ( Redonda ), and Santa Cruz ( Saint Croix , on 14 November). He also sighted and named the island chain of Santa Úrsula y las Once Mil Vírgenes (the Virgin Islands ), and named
4216-410: The Niña ' s lateen sails were re-rigged to standard square sails. Final provisions were secured, and on 6 September the ships departed San Sebastián de La Gomera for what turned out to be a five-week-long westward voyage across the Atlantic. As described in the abstract of his journal made by Bartolomé de las Casas , on the outward bound voyage Columbus recorded two sets of distances: one
4340-684: The North American and Eurasian plates in the North Atlantic and the South American and African plates in the South Atlantic. The MAR produces basaltic volcanoes in Eyjafjallajökull , Iceland, and pillow lava on the ocean floor. The depth of water at the apex of the ridge is less than 2,700 m (1,500 fathoms ; 8,900 ft ) in most places, while the bottom of the ridge is three times as deep. The MAR
4464-616: The North Atlantic Drift is thought to have at least some influence on climate. For example, the Gulf Stream helps moderate winter temperatures along the coastline of southeastern North America, keeping it warmer in winter along the coast than inland areas. The Gulf Stream also keeps extreme temperatures from occurring on the Florida Peninsula. In the higher latitudes, the North Atlantic Drift, warms
4588-514: The North Atlantic oscillation , occurs. On average, the Atlantic is the saltiest major ocean; surface water salinity in the open ocean ranges from 33 to 37 parts per thousand (3.3–3.7%) by mass and varies with latitude and season. Evaporation, precipitation, river inflow and sea ice melting influence surface salinity values. Although the lowest salinity values are just north of the equator (because of heavy tropical rainfall), in general,
4712-608: The North Star . It was once believed that Columbus had discovered magnetic declination , but it was later shown that the phenomenon was already known, both in Europe and in China. After 29 days out of sight of land, on October 7 1492, the crew spotted "[i]mmense flocks of birds", some of which his sailors trapped and determined to be "field" birds (probably Eskimo curlews and American golden plovers ). Columbus changed course to follow their flight. On October 10, Columbus quelled
4836-555: The Scotia Sea , and other tributary water bodies. Including these marginal seas the coast line of the Atlantic measures 111,866 km (69,510 mi) compared to 135,663 km (84,297 mi) for the Pacific. Including its marginal seas, the Atlantic covers an area of 106,460,000 km (41,100,000 sq mi) or 23.5% of the global ocean and has a volume of 310,410,900 km (74,471,500 cu mi) or 23.3% of
4960-619: The Titan in Greek mythology , who supported the heavens and who later appeared as a frontispiece in medieval maps and also lent his name to modern atlases . On the other hand, to early Greek sailors and in ancient Greek mythological literature such as the Iliad and the Odyssey , this all-encompassing ocean was instead known as Oceanus , the gigantic river that encircled the world; in contrast to
5084-666: The United Kingdom . From the 16th to 19th centuries, the Atlantic Ocean was the center of both an eponymous slave trade and the Columbian exchange while occasionally hosting naval battles. Such naval battles, as well as growing trade from regional American powers like the United States and Brazil , both increased in degree during the early 20th century, and while no major military conflicts have taken place in
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5208-638: The meridional overturning circulation (MOC), the northward heat transport of which is threatened by anthropogenic climate change. Large variations in the subpolar gyre on a decade-century scale, associated with the North Atlantic oscillation , are especially pronounced in Labrador Sea Water , the upper layers of the MOC. The South Atlantic is dominated by the anti-cyclonic southern subtropical gyre. The South Atlantic Central Water originates in this gyre, while Antarctic Intermediate Water originates in
5332-458: The thermocline of the subtropical gyre. The Sargasso Sea in the western North Atlantic can be defined as the area where two species of Sargassum ( S. fluitans and natans ) float, an area 4,000 km (2,500 mi) wide and encircled by the Gulf Stream , North Atlantic Drift , and North Equatorial Current . This population of seaweed probably originated from Tertiary ancestors on
5456-408: The trade winds . He planned to first sail to the Canary Islands before continuing west by utilizing the northeast trade wind. Part of the return to Spain would require travelling against the wind using an arduous sailing technique called beating , during which almost no progress can be made. To effectively make the return voyage, Columbus would need to follow the curving trade winds northeastward to
5580-578: The 1870s, the Challenger expedition discovered parts of what is now known as the Mid-Atlantic Ridge, or: An elevated ridge rising to an average height of about 1,900 fathoms [3,500 m; 11,400 ft] below the surface traverses the basins of the North and South Atlantic in a meridianal direction from Cape Farewell, probably its far south at least as Gough Island, following roughly
5704-618: The 1953 definition it extends south to Antarctica, while in later maps it is bounded at the 60° parallel by the Southern Ocean. The Atlantic has irregular coasts indented by numerous bays, gulfs and seas. These include the Baltic Sea , Black Sea , Caribbean Sea , Davis Strait , Denmark Strait , part of the Drake Passage , Gulf of Mexico , Labrador Sea , Mediterranean Sea , North Sea , Norwegian Sea , almost all of
5828-485: The 1960s and CFCs . The clockwise warm-water North Atlantic Gyre occupies the northern Atlantic, and the counter-clockwise warm-water South Atlantic Gyre appears in the southern Atlantic. In the North Atlantic, surface circulation is dominated by three inter-connected currents: the Gulf Stream which flows north-east from the North American coast at Cape Hatteras ; the North Atlantic Current ,
5952-592: The Americas, in the Bay of Rincón at the eastern end of the Samaná Peninsula in northeast Hispaniola. There he encountered the Ciguayos , the only natives who offered violent resistance during this first voyage. The Ciguayos refused to trade the number of bows and arrows that Columbus desired; in the ensuing clash one Ciguayo was stabbed in the buttocks and another wounded with an arrow in his chest. Because of
6076-471: The Americas, the Atlantic Ocean has played a central role in the development of human society, globalization, and the histories of many nations. While the Norse were the first known humans to cross the Atlantic, it was the expedition of Christopher Columbus in 1492 that proved to be the most consequential. Columbus' expedition ushered in an age of exploration and colonization of the Americas by European powers , most notably Portugal , Spain , France , and
6200-419: The Atlantic and Pacific. Marine organisms on both sides of the isthmus became isolated and either diverged or went extinct. Expedition of Christopher Columbus Between 1492 and 1504, the Italian navigator and explorer Christopher Columbus led four transatlantic maritime expeditions in the name of the Catholic Monarchs of Spain to the Caribbean and to Central and South America. These voyages led to
6324-407: The Atlantic are wide off Newfoundland, southernmost South America, and northeastern Europe. In the western Atlantic carbonate platforms dominate large areas, for example, the Blake Plateau and Bermuda Rise . The Atlantic is surrounded by passive margins except at a few locations where active margins form deep trenches : the Puerto Rico Trench (8,376 m or 27,480 ft maximum depth) in
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#17327649323666448-409: The Atlantic because of the land area it had to reconquer from the Moors during the Reconquista . This remained unchanged until the late 15th century, following the dynastic union by marriage of Queen Isabella I of Castile and King Ferdinand II of Aragon (together known as the Catholic Monarchs of Spain ) in 1469, and the completion of the Reconquista in 1492, when the joint rulers conquered
6572-468: The Atlantic include the Challenger expedition and the German Meteor expedition ; as of 2001 , Columbia University 's Lamont–Doherty Earth Observatory and the United States Navy Hydrographic Office conduct research on the ocean. The MAR divides the Atlantic longitudinally into two halves, in each of which a series of basins are delimited by secondary, transverse ridges. The MAR reaches above 2,000 m (6,600 ft) along most of its length, but
6696-403: The Atlantic north of the equator. The coldest zones are in high latitudes, with the coldest regions corresponding to the areas covered by sea ice. Ocean currents influence the climate by transporting warm and cold waters to other regions. The winds that are cooled or warmed when blowing over these currents influence adjacent land areas. The Gulf Stream and its northern extension towards Europe,
6820-407: The Atlantic recently, the ocean remains a core component of trade around the world. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and the Americas to the west. As one component of the interconnected World Ocean , it is connected in the north to the Arctic Ocean , to the Pacific Ocean in the southwest, the Indian Ocean in
6944-408: The Atlantic sea ' , etym . ' Sea of Atlas ' ) and in The Histories of Herodotus around 450 BC (Hdt. 1.202.4): Atlantis thalassa (Ancient Greek: Ἀτλαντὶς θάλασσα , ' Sea of Atlas ' or ' the Atlantic sea ' ) where the name refers to "the sea beyond the pillars of Heracles " which is said to be part of the sea that surrounds all land. In these uses, the name refers to Atlas ,
7068-409: The Bahamas, while coarse river outwash sands and silt are common in shallow shelf areas like the Georges Bank . Coarse sand, boulders, and rocks were transported into some areas, such as off the coast of Nova Scotia or the Gulf of Maine during the Pleistocene ice ages. The break-up of Pangaea began in the central Atlantic, between North America and Northwest Africa, where rift basins opened during
7192-480: The Catholic Monarchs gave him an allowance, totaling about 14,000 maravedís for the year, or about the annual salary of a sailor. In 1488 Columbus again appealed to the court of Portugal, receiving a new invitation for an audience with John II. This again proved unsuccessful, in part because not long afterwards Bartolomeu Dias returned to Portugal following a successful rounding of the southern tip of Africa. With an eastern sea route now under its control, Portugal
7316-438: The Ciguayos' use of arrows, Columbus named the inlet the Bay of Arrows (or Gulf of Arrows). Four natives who boarded the Niña at Samaná Peninsula told Columbus of what was possibly the Isla de Carib, which was supposed to be populated by cannibalistic Caribs , as well as Matinino, an island populated only by women, which Columbus associated with an island in the Indian Ocean described by Marco Polo . On 16 January 1493,
7440-404: The European shores of the former Tethys Ocean and has, if so, maintained itself by vegetative growth , floating in the ocean for millions of years. Other species endemic to the Sargasso Sea include the sargassum fish , a predator with algae-like appendages which hovers motionless among the Sargassum . Fossils of similar fishes have been found in fossil bays of the former Tethys Ocean, in what
7564-405: The Late Triassic and Early Jurassic. This period also saw the first stages of the uplift of the Atlas Mountains. The exact timing is controversial with estimates ranging from 200 to 170 Ma. The opening of the Atlantic Ocean coincided with the initial break-up of the supercontinent Pangaea , both of which were initiated by the eruption of the Central Atlantic Magmatic Province (CAMP), one of
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#17327649323667688-456: The Moorish kingdom of Granada , which had been providing Castile with African goods through tribute . The fledgling Spanish Empire decided to fund Columbus's expedition in hopes of finding new trade routes and circumventing the lock Portugal had secured on Africa and the Indian Ocean with the 1481 papal bull Aeterni regis . In response to the need for a new route to Asia, by the 1480s, Christopher and his brother Bartholomew had developed
7812-468: The North Atlantic Gyre, the cyclonic North Atlantic Subpolar Gyre plays a key role in climate variability. It is governed by ocean currents from marginal seas and regional topography, rather than being steered by wind, both in the deep ocean and at sea level. The subpolar gyre forms an important part of the global thermohaline circulation . Its eastern portion includes eddying branches of the North Atlantic Current which transport warm, saline waters from
7936-418: The Portuguese Azores Islands , but others felt that they were considerably north of the islands. Columbus turned out to be right. On the night of 17 February, the Niña laid anchor at Santa Maria Island , but the cable broke on sharp rocks, forcing Columbus to stay offshore until morning when a safer location was found nearby. A few sailors took a boat to the island, where they were told by several islanders of
8060-399: The Sait Matty Road. Afrinat International Airlines had its head office in Bakau. Bakau is perhaps the most developed settlement in the Gambia, with excellent communication facilities. Only the major roads are paved and the rate of electricity connection is almost universal. There are several hotels and a few guest houses. The only national stadium, the multi-purpose Independence Stadium ,
8184-437: The South Atlantic, and the "Atmospheric Bridge", which evaporates subtropical Atlantic waters and exports it to the Pacific. The Atlantic Ocean consists of four major, upper water masses with distinct temperature and salinity. The Atlantic subarctic upper water in the northernmost North Atlantic is the source for subarctic intermediate water and North Atlantic intermediate water. North Atlantic central water can be divided into
8308-412: The atmosphere over the oceans, keeping the British Isles and northwestern Europe mild and cloudy, and not severely cold in winter, like other locations at the same high latitude. The cold water currents contribute to heavy fog off the coast of eastern Canada (the Grand Banks of Newfoundland area) and Africa's northwestern coast. In general, winds transport moisture and air over land areas. Every winter,
8432-421: The best they can. I believe that people from the mainland come here to take them as slaves . They ought to make good and skilled servants, for they repeat very quickly whatever we say to them. I think they can very easily be made Christians, for they seem to have no religion. If it pleases our Lord, I will take six of them to Your Highnesses when I depart, in order that they may learn our language. Columbus called
8556-433: The curvature of the Earth. Eratosthenes (who assumed three variables he had not proved: the distance of the sun, parallel light rays, and that the earth was spherical) had measured the diameter of the Earth with good precision in the 2nd century BC, and the means of calculating its diameter using an astrolabe was known to both scholars and navigators. Where Columbus differed from the generally accepted view of his time
8680-431: The east, the boundaries of the ocean proper are Europe: the Strait of Gibraltar (where it connects with the Mediterranean Sea – one of its marginal seas – and, in turn, the Black Sea , both of which also touch upon Asia) and Africa. In the southeast, the Atlantic merges into the Indian Ocean. The 20° East meridian , running south from Cape Agulhas to Antarctica defines its border. In
8804-544: The eastern and western North Atlantic central water since the western part is strongly affected by the Gulf Stream and therefore the upper layer is closer to underlying fresher subpolar intermediate water. The eastern water is saltier because of its proximity to Mediterranean water. North Atlantic central water flows into South Atlantic central water at 15°N . There are five intermediate waters: four low-salinity waters formed at subpolar latitudes and one high-salinity formed through evaporation. Arctic intermediate water flows from
8928-805: The enclosed seas well known to the Greeks: the Mediterranean and the Black Sea. In contrast, the term "Atlantic" originally referred specifically to the Atlas Mountains in Morocco and the sea off the Strait of Gibraltar and the West African coast. The term " Aethiopian Ocean ", derived from Ancient Ethiopia , was applied to the southern Atlantic as late as the mid-19th century. During
9052-528: The holy crocodile pool in Kachikally, the central district of Bakau. Bakau itself was a small village at the turn of the 19th century and grew in importance as it became a favourite place for private residences of colonial administrators, especially along the beautiful palm fringed beaches. Despite being a major town, the old village still exists and is run like any other in the Gambia, with an 'Alkali' (similar to 'Mayor') and divided into Kabilos . There exists
9176-426: The homeward journey was begun. While returning to Spain, the Niña and Pinta encountered the roughest storm of their journey, and on the night of 13 February, lost contact with each other. All hands on the Niña vowed, if they were spared, to make a pilgrimage to the nearest church of Our Lady wherever they first made land. On the morning of 15 February, land was spotted. Columbus believed they were approaching
9300-632: The indigenous Americans indios (Spanish for 'Indians') in the mistaken belief that he had reached the East Indies; the islands of the Caribbean are termed the West Indies because of this error. Columbus initially encountered the Lucayan , Taíno , and Arawak peoples. Noting their gold ear ornaments, Columbus took some of the Arawaks prisoners and insisted that they guide him to
9424-524: The island San Juan Bautista after Saint John the Baptist , preacher and prophet who baptized Jesus Christ , and remained anchored there for two days, 20 and 21 November 1493. Fleet member Diego Álvarez Chanca recounts that as they sailed along the southern coast of Puerto Rico , a Taino woman and boy, who had volunteered to join them on-board in Guadeloupe , after having been rescued together with
9548-475: The island of La Gomera in the Canaries , then undergoing conquest by Castile , Columbus heard from some inhabitants of El Hierro that there was supposed to be a group of islands to the west. A popular misconception that Columbus had difficulty obtaining support for his plan because Europeans thought the Earth was flat can be traced back to a 17th-century campaign of Protestants against Catholicism, and
9672-530: The island of Virgin Gorda . On Santa Cruz , the Europeans saw a canoe with a few Carib men and two women. They had two male captives, and had recently castrated them. The Europeans pursued them, and were met with arrows from both the men and women, fatally wounding at least one man, who perished about a week later. The Europeans either killed or captured all aboard the canoe, thereafter beheading them. Another
9796-462: The island's captain, João de Castanheira, ostensibly out of fear that they were pirates. Castanheira commandeered their shore boat, which he took with several armed men to the Niña , planning to arrest Columbus. When Columbus defied him, Castanheira said he did not believe or care about Columbus' story, denounced the Spaniards, and went back to the island. After another two days, Castanheira released
9920-454: The latter 2,000 km (1,200 mi). Ocean currents such as the Gulf Stream transport eel larvae from the Sargasso Sea to foraging areas in North America, Europe, and northern Africa. Recent but disputed research suggests that eels possibly use Earth's magnetic field to navigate through the ocean both as larvae and as adults. The climate is influenced by the temperatures of the surface waters and water currents as well as winds. Because of
10044-666: The limits of the oceans and seas in 1953, but some of these definitions have been revised since then and some are not recognized by various authorities, institutions, and countries, for example the CIA World Factbook . Correspondingly, the extent and number of oceans and seas vary. The Atlantic Ocean is bounded on the west by North and South America. It connects to the Arctic Ocean through the Denmark Strait , Greenland Sea , Norwegian Sea and Barents Sea . To
10168-435: The locals) Tourism is the most important business activity in Bakau providing a lot of employment, as well as income for the municipal authority. At Cape Point there are a few hotels on a beach, arguably superior to the main Atlantic Ocean beach, which is home to most of the hotels in the country. In town there are a few guest houses. There is also a major market along the main road famous for its fruit and vegetables. Fishing
10292-501: The lowest values are in the high latitudes and along coasts where large rivers enter. Maximum salinity values occur at about 25° north and south , in subtropical regions with low rainfall and high evaporation. The high surface salinity in the Atlantic, on which the Atlantic thermohaline circulation is dependent, is maintained by two processes: the Agulhas Leakage/Rings , which brings salty Indian Ocean waters into
10416-514: The margins of the continents constitute about 11% of the bottom topography with few deep channels cut across the continental rise. The mean depth between 60°N and 60°S is 3,730 m (12,240 ft), or close to the average for the global ocean, with a modal depth between 4,000 and 5,000 m (13,000 and 16,000 ft). In the South Atlantic the Walvis Ridge and Rio Grande Rise form barriers to ocean currents. The Laurentian Abyss
10540-664: The maximum depth, the Milwaukee Deep in the Puerto Rico Trench , is 8,376 m (27,480 ft). Top large seas: The bathymetry of the Atlantic is dominated by a submarine mountain range called the Mid-Atlantic Ridge (MAR). It runs from 87°N or 300 km (190 mi) south of the North Pole to the subantarctic Bouvet Island at 54°S . Expeditions to explore the bathymertry of
10664-459: The middle latitudes of the North Atlantic, where he would be able to catch the " westerlies " that blow eastward to the coast of Western Europe. The navigational technique for travel in the Atlantic appears to have been exploited first by the Portuguese, who referred to it as the volta do mar ('turn of the sea'). Columbus's knowledge of the Atlantic wind patterns was, however, imperfect at
10788-603: The morning of October 12. Columbus called this island San Salvador; its indigenous name was Guanahani . The modern San Salvador Island in the Bahamas is considered to be the most likely candidate for this island. Columbus wrote of the natives he first encountered in his journal entry of 12 October 1492: Many of the men I have seen have scars on their bodies, and when I made signs to them to find out how this happened, they indicated that people from other nearby islands come to San Salvador to capture them; they defend themselves
10912-680: The most extensive and voluminous large igneous provinces in Earth's history associated with the Triassic–Jurassic extinction event , one of Earth's major extinction events . Theoliitic dikes , sills , and lava flows from the CAMP eruption at 200 Ma have been found in West Africa, eastern North America, and northern South America. The extent of the volcanism has been estimated to 4.5 × 10 km (1.7 × 10 sq mi) of which 2.5 × 10 km (9.7 × 10 sq mi) covered what
11036-510: The name " West Indies " being attached to the Bahamas and the islands of the Caribbean . At the time of Columbus's voyages, the Americas were inhabited by Indigenous Americans , and Columbus later participated in the beginning of the Spanish conquest of the Americas . Columbus died in 1506, and the next year, the New World was named "America" after Amerigo Vespucci , who realized that it
11160-487: The natives, a few Taíno he had kidnapped, flowers, and a hammock. He also brought the previously unknown tobacco plant, the pineapple fruit, and the turkey. He did not bring any of the precious East Indies spices such as black pepper, ginger or cloves. In his log, he wrote "there is also plenty of 'ají', which is their pepper, which is more valuable than black pepper, and all the people eat nothing else, it being very wholesome". Columbus brought captured Taínos to present to
11284-477: The newly claimed and colonized for the Crown; he would also receive ten percent of all the revenues from the new lands in perpetuity if he was successful. He had the right to nominate three people, from whom the sovereigns would choose one, for any office in the new lands. The terms were unusually generous but, as his son later wrote, the monarchs were not confident of his return. For his westward voyage to find
11408-571: The north to become the source for North Atlantic deep water, south of the Greenland-Scotland sill. These two intermediate waters have different salinity in the western and eastern basins. The wide range of salinities in the North Atlantic is caused by the asymmetry of the northern subtropical gyre and a large number of contributions from a wide range of sources: Labrador Sea, Norwegian-Greenland Sea, Mediterranean, and South Atlantic Intermediate Water. The North Atlantic deep water (NADW)
11532-425: The ocean's great capacity to store and release heat, maritime climates are more moderate and have less extreme seasonal variations than inland climates. Precipitation can be approximated from coastal weather data and air temperature from water temperatures. The oceans are the major source of atmospheric moisture that is obtained through evaporation. Climatic zones vary with latitude; the warmest zones stretch across
11656-627: The outlines of the coasts of the Old and the New Worlds. The remainder of the ridge was discovered in the 1920s by the German Meteor expedition using echo-sounding equipment. The exploration of the MAR in the 1950s led to the general acceptance of seafloor spreading and plate tectonics . Most of the MAR runs under water but where it reaches the surfaces it has produced volcanic islands. While nine of these have collectively been nominated
11780-595: The pond", rather than to discuss the ocean itself. The term dates to 1640, first appearing in print in a pamphlet released during the reign of Charles I , and reproduced in 1869 in Nehemiah Wallington 's Historical Notices of Events Occurring Chiefly in The Reign of Charles I , where "great Pond" is used in reference to the Atlantic Ocean by Francis Windebank , Charles I's Secretary of State . The International Hydrographic Organization (IHO) defined
11904-414: The prisoners, having been unable to get confessions from them or to capture his real target, Columbus. Some claimed that Columbus was captured, but this is contradicted by Columbus's logbook. Leaving the island of Santa Maria in the Azores on 23 February, Columbus headed for Castilian Spain, but another storm forced him into Lisbon . He anchored next to a king's harbor patrol ship on 4 March 1493, where he
12028-450: The rudder of the Pinta broke. Martín Alonso Pinzón suspected the owners of the ship of sabotage, as they were afraid to go on the journey. The crew was able to secure the rudder with ropes until they could reach the Canary Islands, where they arrived on 9 August. The Pinta had its rudder replaced on the island of Gran Canaria , and by September 2 the ships rendezvoused at La Gomera, where
12152-438: The seafloor. The oldest oceanic crust in the Atlantic is up to 145 million years and is situated off the west coast of Africa and the east coast of North America, or on either side of the South Atlantic. In many places, the continental shelf and continental slope are covered in thick sedimentary layers. For instance, on the North American side of the ocean, large carbonate deposits formed in warm shallow waters such as Florida and
12276-527: The source of the gold. Columbus noted that their primitive weapons and military tactics made the natives susceptible to easy conquest. Columbus observed the people and their cultural lifestyle. He also explored the northeast coast of Cuba , landing on 28 October 1492, and the north-western coast of Hispaniola , present day Haiti , by December 5 1492. Here, the Santa Maria ran aground on Christmas Day , 25 December 1492, and had to be abandoned. Columbus
12400-536: The southeast, and the Southern Ocean in the south. Other definitions describe the Atlantic as extending southward to Antarctica . The Atlantic Ocean is divided in two parts, the northern and southern Atlantic, by the Equator . The oldest known mentions of an "Atlantic" sea come from Stesichorus around mid-sixth century BC (Sch. A. R. 1. 211): Atlantikôi pelágei (Ancient Greek: Ἀτλαντικῷ πελάγει , '
12524-463: The sovereigns, never having met the infamous Caribs. In Columbus's letter on the first voyage , addressed to the Spanish court, he insisted he had reached Asia, describing the island of Hispaniola as being off the coast of China. He emphasized the potential riches of the land, exaggerating the abundance of gold, and that the natives seemed ready to convert to Christianity. The letter was translated into multiple languages and widely distributed, creating
12648-551: The subtropics to the northeastern Atlantic. There this water is cooled during winter and forms return currents that merge along the eastern continental slope of Greenland where they form an intense (40–50 Sv ) current which flows around the continental margins of the Labrador Sea . A third of this water becomes part of the deep portion of the North Atlantic Deep Water (NADW). The NADW, in turn, feeds
12772-421: The surface is usually covered with sea ice in the Labrador Sea , Denmark Strait , and Baltic Sea. The Coriolis effect circulates North Atlantic water in a clockwise direction, whereas South Atlantic water circulates counter-clockwise. The south tides in the Atlantic Ocean are semi-diurnal; that is, two high tides occur every 24 lunar hours. In latitudes above 40° North some east–west oscillation, known as
12896-433: The time of his first voyage. By sailing directly due west from the Canary Islands during hurricane season , skirting the so-called horse latitudes of the mid-Atlantic, Columbus risked either being becalmed or running into a tropical cyclone , both of which, by chance, he avoided. Around 1484, King John II of Portugal submitted Columbus's proposal to his experts, who rejected it on the basis that Columbus's estimation of
13020-428: The total volume of the Earth's oceans. Excluding its marginal seas, the Atlantic covers 81,760,000 km (31,570,000 sq mi) and has a volume of 305,811,900 km (73,368,200 cu mi). The North Atlantic covers 41,490,000 km (16,020,000 sq mi) (11.5%) and the South Atlantic 40,270,000 km (15,550,000 sq mi) (11.1%). The average depth is 3,646 m (11,962 ft) and
13144-636: The upper layers of the circumpolar region, near the Drake Passage and the Falkland Islands. Both these currents receive some contribution from the Indian Ocean. On the African east coast, the small cyclonic Angola Gyre lies embedded in the large subtropical gyre. The southern subtropical gyre is partly masked by a wind-induced Ekman layer . The residence time of the gyre is 4.4–8.5 years. North Atlantic Deep Water flows southward below
13268-576: The voyage to be in violation of the 1479 Treaty of Alcáçovas . After spending more than a week in Portugal, Columbus set sail for Spain. He arrived back in Palos on 15 March 1493 and later met with Ferdinand and Isabella in Barcelona to report his findings. Columbus showed off what he had brought back from his voyage to the monarchs, including a few small samples of gold, pearls , gold jewelry from
13392-424: The western Atlantic and South Sandwich Trench (8,264 m or 27,113 ft) in the South Atlantic. There are numerous submarine canyons off northeastern North America, western Europe, and northwestern Africa. Some of these canyons extend along the continental rises and farther into the abyssal plains as deep-sea channels. In 1922, a historic moment in cartography and oceanography occurred. The USS Stewart used
13516-454: The widespread knowledge of the New World . This breakthrough inaugurated the period known as the Age of Discovery , which saw the colonization of the Americas , a related biological exchange , and trans-Atlantic trade . These events, the effects and consequences of which persist to the present, are often cited as the beginning of the modern era . Born in the Republic of Genoa , Columbus
13640-595: Was a navigator who sailed in search of a westward route to India , China , Japan and the Spice Islands thought to be the East Asian source of spices and other precious oriental goods obtainable only through arduous overland routes . Columbus was partly inspired by 13th-century Italian explorer Marco Polo in his ambition to explore Asia. His initial belief that he had reached "the Indies" has resulted in
13764-629: Was a unique landmass. The search for a westward route to Asia was completed in 1521, when the Magellan expedition sailed across the Pacific Ocean and reached Southeast Asia , before returning to Europe and completing the first circumnavigation of the world. Many Europeans of Columbus's day assumed that a single, uninterrupted ocean surrounded Europe, Asia and Africa, although Norse explorers had colonized areas of North America beginning with Greenland c. 986 . The Norse maintained
13888-732: Was directed by Ferdinand and Isabella to maintain friendly, even loving, relations with the natives. He set sail from Cádiz , Spain, on 25 September 1493. The fleet for the second voyage was much larger: two naos and 15 caravels. The two naos were the flagship Marigalante ("Gallant Mary") and the Gallega ; the caravels were the Fraila ('the nun'), San Juan , Colina ('the hill'), Gallarda ('the gallant'), Gutierre , Bonial , Rodriga , Triana , Vieja ('the old'), Prieta ('the brown'), Gorda ('the fat'), Cardera , and Quintera . The Niña returned for this expedition, which also included
14012-547: Was finally convinced by the king's clerk Luis de Santángel , who argued that Columbus would bring his ideas elsewhere, and offered to help arrange the funding. Isabella then sent a royal guard to fetch Columbus, who had travelled several kilometers toward Córdoba. In the April 1492 " Capitulations of Santa Fe ", Columbus was promised he would be given the title "Admiral of the Ocean Sea" and appointed viceroy and governor of
14136-405: Was in his incorrect assumption of a significantly smaller diameter for the Earth, claiming that Asia could be easily reached by sailing west across the Atlantic. Most scholars accepted Ptolemy 's correct assessment that the terrestrial landmass (for Europeans of the time, comprising Eurasia and Africa ) occupied 180 degrees of the terrestrial sphere, and dismissed Columbus's claim that the Earth
14260-410: Was in measurements he normally used, the other in the Portuguese maritime leagues used by his crew. Las Casas originally interpreted that he reported the shorter distances to his crew so they would not worry about sailing too far from Spain, but Oliver Dunn and James Kelley state that this was a misunderstanding. On 13 September 1492, Columbus observed that the needle of his compass no longer pointed to
14384-542: Was much smaller and that Asia was only a few thousand nautical miles to the west of Europe. Columbus believed the incorrect calculations of Marinus of Tyre , putting the landmass at 225 degrees, leaving only 135 degrees of water. Moreover, Columbus underestimated Alfraganus 's calculation of the length of a degree, reading the Arabic astronomer's writings as if, rather than using the Arabic mile (about 1,830 m), he had used
14508-560: Was nicknamed the Niña ("girl"), perhaps in reference to her owner, Juan Niño of Moguer. The Pinta and the Niña were piloted by the Pinzón brothers ( Martín Alonso and Vicente Yáñez , respectively). On the morning of 3 August 1492, Columbus departed from Palos de la Frontera , Huelva , going down the Rio Tinto and into the Atlantic. Three days into the journey, on 6 August 1492,
14632-491: Was no longer interested in trailblazing a western trade route to Asia crossing unknown seas. In May 1489, Isabella sent Columbus another 10,000 maravedis , and the same year the Catholic Monarchs furnished him with a letter ordering all cities and towns under their domain to provide him food and lodging at no cost. As Queen Isabella's forces neared victory over the Moorish Emirate of Granada for Castile, Columbus
14756-577: Was popularized in works such as Washington Irving 's 1828 biography of Columbus. In fact, the knowledge that the Earth is spherical was widespread, having been the general opinion of Ancient Greek science, and gaining support throughout the Middle Ages (for example, Bede mentions it in The Reckoning of Time ). The primitive maritime navigation of Columbus's time relied on both the stars and
14880-434: Was received by the native cacique (chieftain) Guacanagari , who gave him permission to leave some of his men behind. Columbus left 39 men, including the interpreter Luis de Torres , and founded the settlement of La Navidad . He kept sailing along the northern coast of Hispaniola with a single ship, until he encountered Pinzón and the Pinta on 6 January. On 13 January 1493, Columbus made his last stop of this voyage in
15004-431: Was sighted by a sailor named Rodrigo de Triana (also known as Juan Rodríguez Bermejo) aboard the Pinta . Triana immediately alerted the rest of the crew with a shout, and the ship's captain, Martín Alonso Pinzón, verified the land sighting and alerted Columbus by firing a lombard . Columbus would later assert that he had first seen land, thus earning the promised annual reward of 10,000 maravedís . They landed on
15128-467: Was summoned to the Spanish court for renewed discussions. He waited at King Ferdinand's camp until January 1492, when the monarchs conquered Granada. A council led by Isabella's confessor, Hernando de Talavera , found Columbus's proposal to reach the Indies implausible. Columbus had left for France when Ferdinand intervened, first sending Talavera and Bishop Diego Deza to appeal to the queen. Isabella
15252-450: Was thrown overboard, and when he was spotted crawling away holding his entrails, the Arawaks recommended he be recaptured so he would not alert his tribe; he was thrown overboard again, and then had to be shot down with arrows. Columbus's childhood friend Michele da Cuneo—according to his own account—took one of the women in the skirmish, whom Columbus let him keep as a slave; Cuneo subsequently beat and raped her. The fleet continued to
15376-483: Was told a fleet of 100 caravels had been lost in the storm. Astoundingly, both the Niña and the Pinta had been spared. Not finding King John II of Portugal in Lisbon, Columbus wrote to him and waited for a reply. The king agreed to meet Columbus at Vale do Paraíso, despite the poor relations between Portugal and Castile at the time. Upon learning of Columbus's discoveries, the Portuguese king informed him that he believed
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