104-734: In oceanography , a mediterranean sea ( / ˌ m ɛ d ɪ t ə ˈ r eɪ n i ə n / MED -ih-tə- RAY -nee-ən ) is a mostly enclosed sea that has limited exchange of water with outer oceans and whose water circulation is dominated by salinity and temperature differences rather than by winds or tides. The eponymous Mediterranean Sea , for example, is almost completely enclosed by Asia , Europe , and Africa . There are two types of mediterranean sea. Oceanography Oceanography (from Ancient Greek ὠκεανός ( ōkeanós ) ' ocean ' and γραφή ( graphḗ ) ' writing '), also known as oceanology , sea science , ocean science , and marine science ,
208-647: A World Heritage Site in Tenerife . Mount Teide is the highest peak in Spain and the 3rd tallest volcano in the world , measured from its base on the ocean floor. The islands have warm summers and winters warm enough for the climate to be technically tropical at sea level. The amount of precipitation and the level of maritime moderation vary depending on location and elevation. The archipelago includes green areas as well as semi-desert. The islands' high mountains are ideal for astronomical observation, because they lie above
312-444: A biosphere reserve by UNESCO . Geologically it is one of the oldest of the archipelago. The insular capital is San Sebastian de La Gomera . Garajonay National Park is located on the island. Lanzarote is the easternmost island and one of the oldest of the archipelago, and it has shown evidence of recent volcanic activity. It has a surface of 845.94 km (326.62 sq mi), and a population of 149,183 inhabitants, including
416-681: A 2024 study by the University of Las Palmas de Gran Canaria, there is archaeological evidence that the Romans were the first to colonise the islands, during the period from the 1st century BCE to the 1st century CE. There was no overlap with the occupation by the people who were inhabiting the islands at the time of the Spanish conquest, who had first arrived sometime between the 1st and 3rd centuries CE. As José Farrujia describes, 'The indigenous Canarians lived mainly in natural caves, usually near
520-427: A acertar: mas partiam os nossos mareantes muy ensinados e prouidos de estromentos e regras de astrologia e geometria que sam as cousas que os cosmographos ham dadar apercebidas (...) e leuaua cartas muy particularmente rumadas e na ja as de que os antigos vsauam" (were not done by chance: but our seafarers departed well taught and provided with instruments and rules of astrology (astronomy) and geometry which were matters
624-577: A large degree of autonomy. In fact, the islands do not enjoy any special degree of autonomy, as each one of the Spanish regions is considered an autonomous community , with equal status to the European ones. Under the Law of the Sea , the only islands not granted territorial waters or an exclusive economic zone (EEZ) are those that are not fit for human habitation, or do not have an economic life of their own, which
728-563: A paper on reefs and the formation of atolls as a result of the second voyage of HMS Beagle in 1831–1836. Robert FitzRoy published a four-volume report of Beagle ' s three voyages. In 1841–1842 Edward Forbes undertook dredging in the Aegean Sea that founded marine ecology. The first superintendent of the United States Naval Observatory (1842–1861), Matthew Fontaine Maury devoted his time to
832-427: A site occupied from 1,600 years ago up until the 1960s, round stone houses, complex burial sites, and associated artefacts have been found. Across the islands are thousands of Libyco-Berber alphabet inscriptions scattered and they have been extensively documented by many linguists. The social structure of indigenous Canarians encompassed "a system of matrilineal descent in most of the islands, in which inheritance
936-442: A volcanic ridge on La Palma, in 2021 . The Teide volcano on Tenerife is the highest mountain in Spain, and the third tallest volcano on Earth on a volcanic ocean island. All the islands except La Gomera have been active in the last million years. Four of them, Lanzarote, Tenerife, La Palma and El Hierro, have historical records of eruptions since European discovery. The islands rise from Jurassic oceanic crust associated with
1040-625: A voyage around the Cape of Good Hope in 1777, he mapped "the banks and currents at the Lagullas " . He was also the first to understand the nature of the intermittent current near the Isles of Scilly , (now known as Rennell's Current). The tides and currents of the ocean are distinct. Tides are the rise and fall of sea levels created by the combination of the gravitational forces of the Moon along with
1144-424: A wide range of disciplines to deepen their understanding of the world’s oceans, incorporating insights from astronomy , biology , chemistry , geography , geology , hydrology , meteorology and physics . Humans first acquired knowledge of the waves and currents of the seas and oceans in pre-historic times. Observations on tides were recorded by Aristotle and Strabo in 384–322 BC. Early exploration of
SECTION 10
#17327653669231248-501: Is La Graciosa , which administratively is dependent on Lanzarote. The archipelago includes many smaller islands and islets, including Alegranza , Isla de Lobos , Montaña Clara , Roque del Oeste , and Roque del Este . It includes a number of rocks, including Garachico and Anaga . In ancient times, the island chain was often referred to as "the Fortunate Isles". The Canary Islands are the southernmost region of Spain , and
1352-513: Is 1,560 km (600 sq mi). Roque Nublo 1,813 metres (5,948 feet) and Pico de las Nieves ("Peak of Snow") 1,949 metres (6,394 feet) are located in the center of the island. On the south of the island are the Maspalomas Dunes (Gran Canaria). La Gomera (informally known as 'Isla Colombina') has an area of 369.76 km (142.77 sq mi) and is the second least populous island with 21,136 inhabitants. It has been declared
1456-651: Is due to the change in the regime of winds and currents: the North Atlantic gyre and the Equatorial counter current will push south along the northwest bulge of Africa, while the uncertain winds where the Northeast trades meet the Southeast trades (the doldrums) leave a sailing ship to the mercy of the currents. Together, prevalent current and wind make northwards progress very difficult or impossible. It
1560-717: Is likely to affect marine organisms with calcareous shells, such as oysters, clams, sea urchins and corals, and the carbonate compensation depth will rise closer to the sea surface. Affected planktonic organisms will include pteropods , coccolithophorids and foraminifera , all important in the food chain . In tropical regions, corals are likely to be severely affected as they become less able to build their calcium carbonate skeletons, in turn adversely impacting other reef dwellers. The current rate of ocean chemistry change seems to be unprecedented in Earth's geological history, making it unclear how well marine ecosystems will adapt to
1664-496: Is mostly concentrated in the two capital islands: around 43% on the island of Tenerife and 40% on the island of Gran Canaria. The Canary Islands, especially Tenerife, Gran Canaria, Fuerteventura, and Lanzarote, are a major tourist destination, with over 16 million visitors in 2023. This is due to their beaches, subtropical climate , and important natural attractions, especially Maspalomas in Gran Canaria and Mount Teide ,
1768-722: Is not the case of the Canary Islands. There are some pro-independence political parties, like the National Congress of the Canaries (CNC) and the Popular Front of the Canary Islands . Their popular support is almost insignificant, with no presence in either the autonomous parliament or the cabildos insulares . In a 2012 study by the Centro de Investigaciones Sociológicas , when asked about national identity,
1872-464: Is now western Morocco in the early first century AD . That same naval force was subsequently sent on an exploration of the Canary Islands, using Mogador as their mission base. The names given by Romans to the individual islands were Ninguaria or Nivaria (Tenerife), Canaria (Gran Canaria), Pluvialia or Invale (Lanzarote), Ombrion (La Palma), Planasia (Fuerteventura), Iunonia or Junonia (El Hierro) and Capraria (La Gomera). From
1976-549: Is remembered in the navigation context for the determination of the loxodromic curve: the shortest course between two points on the surface of a sphere represented onto a two-dimensional map. When he published his "Treatise of the Sphere" (1537), mostly a commentated translation of earlier work by others, he included a treatise on geometrical and astronomic methods of navigation. There he states clearly that Portuguese navigations were not an adventurous endeavour: "nam se fezeram indo
2080-584: Is retained in their depiction on the islands' coat-of-arms. Other theories speculate that the name comes from the Nukkari Berber tribe living in the Moroccan Atlas, named in Roman sources as Canarii , though Pliny again mentions the relation of this term with dogs. The name of the islands is not derived from the canary bird ; rather, the birds are named after the islands. From west to east,
2184-471: Is the highest peak of Spain and a World Heritage Site . Tenerife is the site of the worst air disaster in the history of aviation, in which 583 people were killed in the collision of two Boeing 747s on 27 March 1977. Graciosa Island or commonly La Graciosa is a volcanic island in the Canary Islands of Spain, located 2 km (1.2 mi) north of the island of Lanzarote across the Strait of El Río. It
SECTION 20
#17327653669232288-517: Is the oldest of the islands being more eroded. Its highest point is the Peak of the Bramble, at a height of 807 metres (2,648 feet). Its capital is Puerto del Rosario . Gran Canaria has 846,717 inhabitants. The capital, Las Palmas de Gran Canaria , with 377,203 inhabitants, is the most populous city and shares the status of capital of the Canaries with Santa Cruz de Tenerife. Gran Canaria's surface area
2392-444: Is the scientific study of the ocean , including its physics , chemistry , biology , and geology . It is an Earth science , which covers a wide range of topics, including ocean currents , waves , and geophysical fluid dynamics ; fluxes of various chemical substances and physical properties within the ocean and across its boundaries; ecosystem dynamics; and plate tectonics and seabed geology. Oceanographers draw upon
2496-712: Is the second largest in the archipelago and located 100 km (62 mi) from the African coast. The islands form the Macaronesia ecoregion with the Azores , Cape Verde , Madeira , and the Savage Isles . The Canary Islands is the largest and most populated archipelago of the Macaronesia region. The archipelago has seven large and several smaller islands, all of which are volcanic in origin. According to
2600-705: The Challenger expedition . Challenger , leased from the Royal Navy, was modified for scientific work and equipped with separate laboratories for natural history and chemistry . Under the scientific supervision of Thomson, Challenger travelled nearly 70,000 nautical miles (130,000 km) surveying and exploring. On her journey circumnavigating the globe, 492 deep sea soundings, 133 bottom dredges, 151 open water trawls and 263 serial water temperature observations were taken. Around 4,700 new species of marine life were discovered. The result
2704-738: The Australian Institute of Marine Science (AIMS), established in 1972 soon became a key player in marine tropical research. In 1921 the International Hydrographic Bureau , called since 1970 the International Hydrographic Organization , was established to develop hydrographic and nautical charting standards. Canary Islands The Canary Islands ( / k ə ˈ n ɛər i / , Spanish : Canarias , Spanish: [kaˈnaɾjas] ), also known informally as
2808-564: The Canary hotspot . The Canary Islands is the only place in Spain where volcanic eruptions have been recorded during the Modern Era , with some volcanoes still active (El Hierro, 2011). Volcanic islands such as those in the Canary chain often have steep ocean cliffs caused by catastrophic debris avalanches and landslides . The island chain's most recent eruption occurred at Cumbre Vieja ,
2912-560: The Civil Guard are based in the territory. Before the arrival of humans, the Canaries were inhabited by prehistoric animals including the giant lizard ( Gallotia goliath ), the Tenerife and Gran Canaria giant rats , and giant tortoises, Geochelone burchardi and Geochelone vulcanica . Although the original settlement of what are now called the Canary Islands is not entirely clear, linguistic, genetic, and archaeological analyses indicate that indigenous peoples were living on
3016-779: The Ishiguro Storm Surge Computer ) generally now replaced by numerical methods (e.g. SLOSH .) An oceanographic buoy array was established in the Pacific to allow prediction of El Niño events. 1990 saw the start of the World Ocean Circulation Experiment (WOCE) which continued until 2002. Geosat seafloor mapping data became available in 1995. Study of the oceans is critical to understanding shifts in Earth's energy balance along with related global and regional changes in climate ,
3120-1169: The Mediterranean Science Commission . Marine research institutes were already in existence, starting with the Stazione Zoologica Anton Dohrn in Naples, Italy (1872), the Biological Station of Roscoff, France (1876), the Arago Laboratory in Banyuls-sur-mer, France (1882), the Laboratory of the Marine Biological Association in Plymouth, UK (1884), the Norwegian Institute for Marine Research in Bergen, Norway (1900),
3224-689: The Phoenicians , the Greeks , and the Carthaginians . King Juba II , Caesar Augustus 's Numidian protégé, is credited with discovering the islands for the Western world. According to Pliny the Elder , Juba found the islands uninhabited, but found "a small temple of stone" and "some traces of buildings". Juba dispatched a naval contingent to re-open the dye production facility at Mogador in what
Mediterranean seas - Misplaced Pages Continue
3328-625: The Roques de Anaga , Garachico and Fasnia in Tenerife, and Salmor and Bonanza in El Hierro. El Hierro, the westernmost island, covers 268.71 km (103.75 sq mi). It is the second smallest of the major islands, and the least populous with 10,798 inhabitants. The whole island was declared a Reserve of the Biosphere in 2000. Its capital is Valverde . Also known as Ferro, it was once
3432-541: The Spanish Senate . Of these, 11 seats are directly elected, 3 for Gran Canaria, 3 for Tenerife, and 1 each for Lanzarote (including La Graciosa), Fuerteventura, La Palma, La Gomera and El Hierro. The other 3 are appointed by the regional legislature. The Autonomous Community of the Canary Islands has two provinces ( provincias ), Las Palmas and Santa Cruz de Tenerife , whose capitals, Las Palmas de Gran Canaria and Santa Cruz de Tenerife , are capitals of
3536-560: The biosphere and biogeochemistry . The atmosphere and ocean are linked because of evaporation and precipitation as well as thermal flux (and solar insolation ). Recent studies have advanced knowledge on ocean acidification , ocean heat content , ocean currents , sea level rise , the oceanic carbon cycle , the water cycle , Arctic sea ice decline , coral bleaching , marine heatwaves , extreme weather , coastal erosion and many other phenomena in regards to ongoing climate change and climate feedbacks . In general, understanding
3640-480: The dragon tree , Dracaena draco are endemic, as noted by Sabin Berthelot and Philip Barker Webb in their work, L'Histoire Naturelle des Îles Canaries (1835–50). The climate is warm subtropical / tropical and generally arid , moderated by the sea and in summer by the trade winds . There are a number of microclimates and the classifications range mainly from semi-desert to desert . The majority of
3744-559: The temperature inversion layer. As a result, the archipelago has two professional astronomical observatories: the Teide Observatory on Tenerife, and Roque de los Muchachos Observatory on La Palma. In 1927, the Province of Canary Islands was split into two provinces. In 1982, the autonomous community of the Canary Islands was established. The cities of Santa Cruz de Tenerife and Las Palmas de Gran Canaria are, jointly,
3848-721: The 14th century onward, numerous visits were made by sailors from Majorca , Portugal , and Genoa . Lancelotto Malocello settled on Lanzarote in 1312. The Majorcans established a mission with a bishop in the islands that lasted from 1350 to 1400. In 1402, the Castilian colonisation of the islands began with the expedition of the French explorers Jean de Béthencourt and Gadifer de la Salle , nobles and vassals of Henry III of Castile , to Lanzarote. From there, they went on to conquer Fuerteventura (1405) and El Hierro. These invasions were "brutal cultural and military clashes between
3952-481: The 29 days Cabral took from Cape Verde up to landing in Monte Pascoal , Brazil. The Danish expedition to Arabia 1761–67 can be said to be the world's first oceanographic expedition, as the ship Grønland had on board a group of scientists, including naturalist Peter Forsskål , who was assigned an explicit task by the king, Frederik V , to study and describe the marine life in the open sea, including finding
4056-400: The African coast, the influence of the current diminishes, and the islands become increasingly arid. Fuerteventura and Lanzarote , the islands which are closest to the African mainland, are effectively desert or semi-desert. Gran Canaria is known as a "continent in miniature" for its diverse landscapes like Maspalomas and Roque Nublo . The north of Tenerife lies under the influence of
4160-655: The Azores), bringing what is now Brazil into the Portuguese area of domination. The knowledge gathered from open sea exploration allowed for the well-documented extended periods of sail without sight of land, not by accident but as pre-determined planned route; for example, 30 days for Bartolomeu Dias culminating on Mossel Bay , the three months Gama spent in the South Atlantic to use the Brazil current (southward), or
4264-717: The Canaries , are a Spanish region, autonomous community and archipelago in the Atlantic Ocean . At their closest point to the African mainland, they are 100 kilometres (62 miles) west of Morocco . They are the southernmost of the autonomous communities of Spain . The islands have a population of 2.2 million people and are the most populous special territory of the European Union . The seven main islands are from largest to smallest in area, Tenerife , Fuerteventura , Gran Canaria , Lanzarote , La Palma , La Gomera , and El Hierro . The only other populated island
Mediterranean seas - Misplaced Pages Continue
4368-481: The Canary Island's territorial waters as being Moroccan coast and Morocco has authorised gas and oil exploration in what the Canary Islands states to be Canarian territorial waters and Western Sahara waters. Morocco's official position is that international laws regarding territorial limits do not authorise Spain to claim seabed boundaries based on the territory of the Canaries, since the Canary Islands enjoy
4472-536: The Canary Islands are El Hierro , La Palma , La Gomera , Tenerife , Gran Canaria , Fuerteventura , Lanzarote , and La Graciosa . North of Lanzarote are the islets of Montaña Clara , Alegranza , Roque del Este and Roque del Oeste , belonging to the Chinijo Archipelago . Northeast of Fuerteventura is the islet of Lobos . There are a series of small adjacent rocks in the Canary Islands:
4576-561: The Canary Islands at least 2,000 years ago, possibly 3,000, and that they shared a common origin with the Berbers on the nearby North African coast. Reaching the islands may have taken place using several small boats, landing on the easternmost islands Lanzarote and Fuerteventura. These groups came to be known collectively as the Guanches , although Guanches had been the name for only the indigenous inhabitants of Tenerife. According to
4680-520: The Canary Islands have a hot desert climate ( BWh ) and a hot semi-desert climate ( BSh ) within the Köppen system, caused partly due to the cool Canary Current . A subtropical humid climate, which is very influenced by the ocean, is in the middle of the islands of La Gomera , Tenerife and La Palma , where laurisilva cloud forests grow. The seven major islands, one minor island, and several small islets were originally volcanic islands, formed by
4784-656: The Gulf Stream's cause. Franklin and Timothy Folger printed the first map of the Gulf Stream in 1769–1770. Information on the currents of the Pacific Ocean was gathered by explorers of the late 18th century, including James Cook and Louis Antoine de Bougainville . James Rennell wrote the first scientific textbooks on oceanography, detailing the current flows of the Atlantic and Indian oceans. During
4888-857: The Laboratory für internationale Meeresforschung, Kiel, Germany (1902). On the other side of the Atlantic, the Scripps Institution of Oceanography was founded in 1903, followed by the Woods Hole Oceanographic Institution in 1930, the Virginia Institute of Marine Science in 1938, the Lamont–Doherty Earth Observatory at Columbia University in 1949, and later the School of Oceanography at University of Washington . In Australia ,
4992-457: The Sun (the Sun just in a much lesser extent) and are also caused by the Earth and Moon orbiting each other. An ocean current is a continuous, directed movement of seawater generated by a number of forces acting upon the water, including wind, the Coriolis effect , breaking waves , cabbeling , and temperature and salinity differences . Sir James Clark Ross took the first modern sounding in deep sea in 1840, and Charles Darwin published
5096-453: The Teide National Park was declared one of the 12 Treasures of Spain . The regional executive body, the Parliament of the Canary Islands , is presided over by Fernando Clavijo Batlle ( Canarian Coalition ), the current President of the Canary Islands . The members of the regional legislature, the Parliament of the Canary Islands , has 70 elected legislators. The last regional election took place in May 2023. The islands have 14 seats in
5200-400: The adjacent islets of the Chinijo Archipelago. The capital is Arrecife , with 56,834 inhabitants. The Chinijo Archipelago includes the islands La Graciosa , Alegranza , Montaña Clara , Roque del Este and Roque del Oeste . It has a surface of 40.8 km (15.8 sq mi), and only La Graciosa is populated, with 658 inhabitants. With 29 km (11 sq mi), La Graciosa is
5304-411: The autonomous community. Each of the seven major islands are ruled by an island council named a Cabildo Insular . Each island is subdivided into smaller municipalities ( municipios ). Las Palmas is divided into 34 municipalities , and Santa Cruz de Tenerife is divided into 54 municipalities . The international boundary of the Canaries is disputed in Morocco-Spain relations . In 2022 the UN declared
SECTION 50
#17327653669235408-424: The bird Serinus canaria (canary) and the Phoenix canariensis palm. Four of Spain's thirteen national parks are located in the Canary Islands, more than any other autonomous community. Two of these have been declared UNESCO World Heritage Sites and the other two are part of Biosphere Reserves . The parks are: Teide National Park is the oldest and largest national park in the Canary Islands and one of
5512-406: The capitals of the islands. Those cities are also, respectively, the capitals of the provinces of Santa Cruz de Tenerife and Las Palmas . Las Palmas de Gran Canaria has been the largest city in the Canaries since 1768, except for a brief period in the 1910s. Between the 1833 territorial division of Spain and 1927, Santa Cruz de Tenerife was the sole capital of the Canary Islands. In 1927, it
5616-496: The cause of mareel , or milky seas. For this purpose, the expedition was equipped with nets and scrapers, specifically designed to collect samples from the open waters and the bottom at great depth. Although Juan Ponce de León in 1513 first identified the Gulf Stream , and the current was well known to mariners, Benjamin Franklin made the first scientific study of it and gave it its name. Franklin measured water temperatures during several Atlantic crossings and correctly explained
5720-573: The centre for oceanographic research well into the 20th century. Murray was the first to study marine trenches and in particular the Mid-Atlantic Ridge , and map the sedimentary deposits in the oceans. He tried to map out the world's ocean currents based on salinity and temperature observations, and was the first to correctly understand the nature of coral reef development. In the late 19th century, other Western nations also sent out scientific expeditions (as did private individuals and institutions). The first purpose-built oceanographic ship, Albatros ,
5824-412: The coast, 300 to 500 metres (1,000 to 1,600 ft) above sea level. These caves were sometimes isolated but more commonly formed settlements, with burial caves nearby'. Archaeological work has uncovered a rich culture visible through artefacts of ceramics , human figures, fishing, hunting and farming tools, plant fibre clothing and vessels, as well as cave paintings. At Lomo de los Gatos on Gran Canaria,
5928-460: The context of the physical, chemical and geological characteristics of their ocean environment. Chemical oceanography is the study of the chemistry of the ocean. Whereas chemical oceanography is primarily occupied with the study and understanding of seawater properties and its changes, ocean chemistry focuses primarily on the geochemical cycles . The following is a central topic investigated by chemical oceanography. Ocean acidification describes
6032-448: The cosmographers would provide (...) and they took charts with exact routes and no longer those used by the ancient). His credibility rests on being personally involved in the instruction of pilots and senior seafarers from 1527 onwards by Royal appointment, along with his recognized competence as mathematician and astronomer. The main problem in navigating back from the south of the Canary Islands (or south of Boujdour ) by sail alone,
6136-434: The currents and winds of the Atlantic, is demonstrated by the understanding of the seasonal variations, with expeditions setting sail at different times of the year taking different routes to take account of seasonal predominate winds. This happens from as early as late 15th century and early 16th: Bartolomeu Dias followed the African coast on his way south in August 1487, while Vasco da Gama would take an open sea route from
6240-404: The decade long period between Bartolomeu Dias finding the southern tip of Africa, and Gama's departure; additionally, there are indications of further travels by Bartolomeu Dias in the area. The most significant consequence of this systematic knowledge was the negotiation of the Treaty of Tordesillas in 1494, moving the line of demarcation 270 leagues to the west (from 100 to 370 leagues west of
6344-406: The decrease in ocean pH that is caused by anthropogenic carbon dioxide (CO 2 ) emissions into the atmosphere . Seawater is slightly alkaline and had a preindustrial pH of about 8.2. More recently, anthropogenic activities have steadily increased the carbon dioxide content of the atmosphere; about 30–40% of the added CO 2 is absorbed by the oceans, forming carbonic acid and lowering
SECTION 60
#17327653669236448-567: The extra heat stored in the ocean from changes in Earth's energy balance . The increase in the ocean heat play an important role in sea level rise , because of thermal expansion . Ocean warming accounts for 90% of the energy accumulation associated with global warming since 1971. Paleoceanography is the study of the history of the oceans in the geologic past with regard to circulation, chemistry, biology, geology and patterns of sedimentation and biological productivity. Paleoceanographic studies using environment models and different proxies enable
6552-433: The first all-woman oceanographic expedition. Until that time, gender policies restricted women oceanographers from participating in voyages to a significant extent. From the 1970s, there has been much emphasis on the application of large scale computers to oceanography to allow numerical predictions of ocean conditions and as a part of overall environmental change prediction. Early techniques included analog computers (such as
6656-422: The first woman to have earned a PhD (at Scripps) in the United States, completed a major work on diatoms that remained the standard taxonomy in the field until well after her death in 1999. In 1940, Cupp was let go from her position at Scripps. Sverdrup specifically commended Cupp as a conscientious and industrious worker and commented that his decision was no reflection on her ability as a scientist. Sverdrup used
6760-441: The indigenous population and the Castilians" lasting over a century due to formidable resistance by indigenous Canarians. Professor Mohamed Adhikari has defined the conquest of the islands as a genocide of the Guanches . Béthencourt received the title King of the Canary Islands, but still recognised King Henry III as his overlord. It was not a simple military enterprise, given the aboriginal resistance on some islands. Neither
6864-400: The instructor billet vacated by Cupp to employ Marston Sargent, a biologist studying marine algae, which was not a new research program at Scripps. Financial pressures did not prevent Sverdrup from retaining the services of two other young post-doctoral students, Walter Munk and Roger Revelle . Cupp's partner, Dorothy Rosenbury, found her a position teaching high school, where she remained for
6968-400: The island erupted . It is the second-highest island of the Canaries, with the Roque de los Muchachos at 2,423 metres (7,949 feet) as its highest point. Santa Cruz de La Palma , known to those on the island as simply "Santa Cruz", is its capital. Tenerife is, with its area of 2,034 km (785 sq mi), the most extensive island of the Canary Islands. With 904,713 inhabitants, it is
7072-424: The island of Lanzarote. It is the smallest and least populated of the main islands, with about 700 people. Tenerife is the largest and most populous island of the archipelago. Gran Canaria , with 865,070 inhabitants, is both the Canary Islands' second most populous island, and the third most populous one in Spain after Tenerife (966,354 inhabitants) and Majorca (896,038 inhabitants). The island of Fuerteventura
7176-424: The largest and most populous archipelago of Macaronesia . Because of their location, the Canary Islands have historically been considered a link between the four continents of Africa , North America , South America , and Europe . In 2023, the Canary Islands had a population of 2,236,013, with a density of 299 inhabitants per km , making it the seventh most populous autonomous community of Spain. The population
7280-408: The largest island of the Chinijo Archipelago and the smallest inhabited island of the Canaries. La Palma, with 81,863 inhabitants covering an area of 708.32 km (273.48 sq mi), is in its entirety a biosphere reserve. For long it showed no signs of volcanic activity, even though the volcano Teneguía entered into eruption last in 1971. On 19 September 2021, the volcanic Cumbre Vieja on
7384-429: The latitude of Sierra Leone , spending three months in the open sea of the South Atlantic to profit from the southwards deflection of the southwesterly on the Brazilian side (and the Brazilian current going southward - Gama departed in July 1497); and Pedro Álvares Cabral (departing March 1500) took an even larger arch to the west, from the latitude of Cape Verde, thus avoiding the summer monsoon (which would have blocked
7488-478: The main factors determining ocean currents. The thermohaline circulation (THC) ( thermo- referring to temperature and -haline referring to salt content ) connects the ocean basins and is primarily dependent on the density of sea water . It is becoming more common to refer to this system as the 'meridional overturning circulation' because it more accurately accounts for other driving factors beyond temperature and salinity. Oceanic heat content (OHC) refers to
7592-549: The majority of respondents from the Canary Islands (53.8%) considered themselves Spanish and Canarian in equal measures, followed by 24% who consider themselves more Canarian than Spanish. 6.1% of the respondents considered themselves only Canarian, and 7% considered themselves only Spanish. The defense of the territory is the responsibility of the Spanish Armed Forces . Components of the Army , Navy , Air Force and
7696-417: The moist Atlantic winds and is well vegetated. The south of the island around the tourist resorts of Playa de las Américas and Los Cristianos is arid. The island rises to almost 4,000 m (13,000 ft) above sea level. At altitude, in the cool relatively wet climate, forests of the endemic pine Pinus canariensis thrive. Many of the plant species in the Canary Islands, like the Canary Island pine and
7800-457: The most populated island of the archipelago and Spain. Two of the islands' principal cities are located on it: the capital, Santa Cruz de Tenerife and San Cristóbal de La Laguna , a World Heritage Site. San Cristóbal de La Laguna , the second city of the island, is home to the oldest university in the Canary Islands, the University of La Laguna . Teide , with its 3,715 metres (12,188 feet)
7904-520: The northern latitudes where the westerly winds will bring the seafarers towards the western coasts of Europe. The secrecy involving the Portuguese navigations, with the death penalty for the leaking of maps and routes, concentrated all sensitive records in the Royal Archives, completely destroyed by the Lisbon earthquake of 1775 . However, the systematic nature of the Portuguese campaign, mapping
8008-535: The ocean's physical attributes including temperature-salinity structure, mixing, surface waves , internal waves, surface tides , internal tides , and currents . The following are central topics investigated by physical oceanography. Since the early ocean expeditions in oceanography, a major interest was the study of ocean currents and temperature measurements. The tides , the Coriolis effect , changes in direction and strength of wind , salinity, and temperature are
8112-412: The oceans was primarily for cartography and mainly limited to its surfaces and of the animals that fishermen brought up in nets, though depth soundings by lead line were taken. The Portuguese campaign of Atlantic navigation is the earliest example of a systematic scientific large project, sustained over many decades, studying the currents and winds of the Atlantic. The work of Pedro Nunes (1502–1578)
8216-519: The oldest in Spain. Located in the geographic centre of the island of Tenerife, it is the most visited national park in Spain. In 2010, it became the most visited national park in Europe and second worldwide. The park's highlight is the Teide volcano. Standing at an altitude of 3,715 metres (12,188 ft), it is the highest elevation in Spain and the third largest volcano on Earth from its base. In 2007,
8320-595: The opening of the Atlantic. Underwater magmatism began during the Cretaceous, and continued to the present day. The current islands reached the ocean's surface during the Miocene . The islands were once considered as a distinct physiographic section of the Atlas Mountains province, which is part of the larger African Alpine System division, but are now recognized as being related to a magmatic hot spot. In
8424-402: The pH (now below 8.1 ) through ocean acidification. The pH is expected to reach 7.7 by the year 2100. An important element for the skeletons of marine animals is calcium , but calcium carbonate becomes more soluble with pressure, so carbonate shells and skeletons dissolve below the carbonate compensation depth . Calcium carbonate becomes more soluble at lower pH, so ocean acidification
8528-705: The polar regions and Africa , so too did the mysteries of the unexplored oceans. The seminal event in the founding of the modern science of oceanography was the 1872–1876 Challenger expedition . As the first true oceanographic cruise, this expedition laid the groundwork for an entire academic and research discipline. In response to a recommendation from the Royal Society , the British Government announced in 1871 an expedition to explore world's oceans and conduct appropriate scientific investigation. Charles Wyville Thomson and Sir John Murray launched
8632-550: The position of the islands with respect to the north-east trade winds , the climate can be mild and wet or very dry. Several native species form laurisilva forests. The individual islands in the Canary archipelago tend to have distinct microclimates . Those islands such as El Hierro , La Palma and La Gomera lying to the west of the archipelago have a climate which is influenced by the moist Canary Current . They are well vegetated even at low levels and have extensive tracts of sub-tropical laurisilva forest. Travelling east toward
8736-588: The prevailing northeasterly trade winds . The name Islas Canarias is likely derived from the Latin name Canariae Insulae , meaning "Islands of the Dogs", perhaps because monk seals or sea dogs were abundant, a name that was evidently generalized from the ancient name of one of these islands, Canaria – presumably Gran Canaria. According to the historian Pliny the Elder , the island Canaria contained "vast multitudes of dogs of very large size". The connection to dogs
8840-474: The rest of her career. (Russell, 2000) Sverdrup, Johnson and Fleming published The Oceans in 1942, which was a major landmark. The Sea (in three volumes, covering physical oceanography, seawater and geology) edited by M.N. Hill was published in 1962, while Rhodes Fairbridge 's Encyclopedia of Oceanography was published in 1966. The Great Global Rift, running along the Mid Atlantic Ridge,
8944-471: The return route from the western coast of Africa (sequentially called 'volta de Guiné' and 'volta da Mina'); and the references to the Sargasso Sea (also called at the time 'Mar da Baga'), to the west of the Azores , in 1436, reveals the western extent of the return route. This is necessary, under sail, to make use of the southeasterly and northeasterly winds away from the western coast of Africa, up to
9048-410: The route taken by Gama at the time he set sail). Furthermore, there were systematic expeditions pushing into the western Northern Atlantic (Teive, 1454; Vogado, 1462; Teles, 1474; Ulmo, 1486). The documents relating to the supplying of ships, and the ordering of sun declination tables for the southern Atlantic for as early as 1493–1496, all suggest a well-planned and systematic activity happening during
9152-570: The scientific community to assess the role of the oceanic processes in the global climate by the reconstruction of past climate at various intervals. Paleoceanographic research is also intimately tied to palaeoclimatology. The earliest international organizations of oceanography were founded at the turn of the 20th century, starting with the International Council for the Exploration of the Sea created in 1902, followed in 1919 by
9256-400: The shifting conditions of the near future. Of particular concern is the manner in which the combination of acidification with the expected additional stressors of higher ocean temperatures and lower oxygen levels will impact the seas. Geological oceanography is the study of the geology of the ocean floor including plate tectonics and paleoceanography . Physical oceanography studies
9360-486: The study of marine meteorology, navigation , and charting prevailing winds and currents. His 1855 textbook Physical Geography of the Sea was one of the first comprehensive oceanography studies. Many nations sent oceanographic observations to Maury at the Naval Observatory, where he and his colleagues evaluated the information and distributed the results worldwide. Knowledge of the oceans remained confined to
9464-530: The submersible DSV Alvin . In the 1950s, Auguste Piccard invented the bathyscaphe and used the bathyscaphe Trieste to investigate the ocean's depths. The United States nuclear submarine Nautilus made the first journey under the ice to the North Pole in 1958. In 1962 the FLIP (Floating Instrument Platform), a 355-foot (108 m) spar buoy, was first deployed. In 1968, Tanya Atwater led
9568-463: The summer of 2011, a series of low-magnitude earthquakes occurred beneath El Hierro. These had a linear trend of northeast–southwest. In October a submarine eruption occurred about 2 km ( 1 + 1 ⁄ 4 mi) south of Restinga. This eruption produced gases and pumice, but no explosive activity was reported. The following table shows the highest mountains in each of the islands: The official natural symbols associated with Canary Islands are
9672-400: The topmost few fathoms of the water and a small amount of the bottom, mainly in shallow areas. Almost nothing was known of the ocean depths. The British Royal Navy 's efforts to chart all of the world's coastlines in the mid-19th century reinforced the vague idea that most of the ocean was very deep, although little more was known. As exploration ignited both popular and scientific interest in
9776-431: The westernmost known land in the world. Ancient European geographers such as Ptolemy recognised the island as the prime meridian of longitude. That remained so until the 19th century, when it was displaced by the one passing through Greenwich . Fuerteventura, with a surface of 1,660 km (640 sq mi), is the second largest island of the archipelago. It has been declared a biosphere reserve by UNESCO . It
9880-434: The world ocean through further scientific study enables better stewardship and sustainable utilization of Earth's resources. The Intergovernmental Oceanographic Commission reports that 1.7% of the total national research expenditure of its members is focused on ocean science. The study of oceanography is divided into these five branches: Biological oceanography investigates the ecology and biology of marine organisms in
9984-736: Was built in 1882. In 1893, Fridtjof Nansen allowed his ship, Fram , to be frozen in the Arctic ice. This enabled him to obtain oceanographic, meteorological and astronomical data at a stationary spot over an extended period. In 1881 the geographer John Francon Williams published a seminal book, Geography of the Oceans . Between 1907 and 1911 Otto Krümmel published the Handbuch der Ozeanographie , which became influential in awakening public interest in oceanography. The four-month 1910 North Atlantic expedition headed by John Murray and Johan Hjort
10088-604: Was discovered by Maurice Ewing and Bruce Heezen in 1953 and mapped by Heezen and Marie Tharp using bathymetric data; in 1954 a mountain range under the Arctic Ocean was found by the Arctic Institute of the USSR. The theory of seafloor spreading was developed in 1960 by Harry Hammond Hess . The Ocean Drilling Program started in 1966. Deep-sea vents were discovered in 1977 by Jack Corliss and Robert Ballard in
10192-625: Was formed by the Canary hotspot. The island is part of the Chinijo Archipelago and the Chinijo Archipelago Natural Park (Parque Natural del Archipiélago Chinijo). It is administered by the municipality of Teguise. In 2018, La Graciosa was declared as the eighth Canary Island by the Spanish Senate , though it is not recognized as such by the Canarian administration. It is administratively dependent on
10296-402: Was it politically, since the particular interests of the nobility (determined to strengthen their economic and political power through the acquisition of the islands) conflicted with those of the states, particularly Castile, which were in the midst of territorial expansion and in a process of strengthening of the crown against the nobility. Historians distinguish two periods in the conquest of
10400-611: Was ordered by decree that the capital of the Canary Islands would be shared between two cities, and this arrangement persists to the present day. The third largest city in the Canary Islands is San Cristóbal de La Laguna , another World Heritage Site on Tenerife. During the Age of Sail , the islands were the main stopover for Spanish galleons during the Spanish colonisation of the Americas , which sailed that far south in order to catch
10504-446: Was passed on via the female line. Social status and wealth were hereditary and determined the individual's position in the social pyramid, which consisted of the king, the relatives of the king, the lower nobility, villeins, plebeians, and finally executioners, butchers, embalmers, and prisoners". Their religion was animist , centring on the sun and moon, as well as natural features such as mountains. The islands may have been visited by
10608-569: Was the Report Of The Scientific Results of the Exploring Voyage of H.M.S. Challenger during the years 1873–76 . Murray, who supervised the publication, described the report as "the greatest advance in the knowledge of our planet since the celebrated discoveries of the fifteenth and sixteenth centuries". He went on to found the academic discipline of oceanography at the University of Edinburgh , which remained
10712-521: Was the most ambitious research oceanographic and marine zoological project ever mounted until then, and led to the classic 1912 book The Depths of the Ocean . The first acoustic measurement of sea depth was made in 1914. Between 1925 and 1927 the "Meteor" expedition gathered 70,000 ocean depth measurements using an echo sounder, surveying the Mid-Atlantic Ridge. In 1934, Easter Ellen Cupp ,
10816-420: Was to overcome this problem and clear the passage to India around Africa as a viable maritime trade route, that a systematic plan of exploration was devised by the Portuguese. The return route from regions south of the Canaries became the ' volta do largo' or 'volta do mar '. The 'rediscovery' of the Azores islands in 1427 is merely a reflection of the heightened strategic importance of the islands, now sitting on
#922077