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73-830: The Yellow Sea , also known as the North Sea , is a marginal sea of the Western Pacific Ocean located between mainland China and the Korean Peninsula , and can be considered the northwestern part of the East China Sea . It is one of four seas named after color terms (the others being the Black Sea , the Red Sea and the White Sea ), and its name is descriptive of the golden-yellow color of

146-452: A slope (called orographic lift ), adiabatically cooling it as it rises and causing the moisture in it to condense. This often causes freezing fog on mountaintops, where the cloud ceiling would not otherwise be low enough. Valley fog forms in mountain valleys , often during winter. It is essentially a radiation fog confined by local topography and can last for several days in calm conditions. In California's Central Valley , valley fog

219-466: A convective phenomenon, resulting in fog that can be very dense and deep and looks fluffy from above. Arctic sea smoke is similar to sea smoke but occurs when the air is very cold. Instead of condensing into water droplets, columns of freezing, rising, and condensing water vapor is formed. The water vapor produces the sea smoke fog and is usually misty and smoke-like. Garúa fog near the coast of Chile and Peru occurs when typical fog produced by

292-470: A day. Their amplitude varies between about 0.9 and 3 meters (3.0 and 9.8 ft) at the coast of China. Tides are higher at the Korean Peninsula, typically ranging between 4 and 8 meters (13 and 26 ft) and reaching the maximum in spring. The tidal system rotates in a counterclockwise direction. The speed of the tidal current is generally less than 1.6 km/h (0.99 mph) in the middle of

365-481: A maximum of 152 m (499 ft). The sea is a flooded section of continental shelf that formed after the last glacial period (some 10,000 years ago) as sea levels rose 120 m (390 ft) to their current levels. The depth gradually increases from north to south. The sea bottom and shores are dominated by sand and silt brought by the rivers through the Bohai Sea ( Liao River , Yellow River , Hai He ) and

438-509: A pipeline exploded at the north-east port of Dalian , causing a wide-scale fire and spreading about 1,500 tonnes of oil over the sea area of 430 km (170 sq mi). The port had been closed and fishing suspended until the end of August. Eight hundred fishing boats and 40 specialized vessels were mobilized to relieve the environmental damage. The Yellow Sea is considered among the most degraded marine areas on earth. Loss of natural coastal habitats due to land reclamation has resulted in

511-452: A principal source of water, particularly in otherwise desert climes, as along many African coastal areas. Some coastal communities use fog nets to extract moisture from the atmosphere where groundwater pumping and rainwater collection are insufficient. Fog can be of different type according to climatic conditions. Artificial fog is man-made fog that is usually created by vaporizing a water- and glycol - or glycerine -based fluid. The fluid

584-534: A short wavelength. To transmit a high frequency wave, air must move back and forth very quickly. Short-wavelength high-pitched sound waves are reflected and refracted by many separated water droplets, partially cancelling and dissipating their energy (a process called " damping "). In contrast, low pitched notes, with a low frequency and a long wavelength, move the air less rapidly and less often, and lose less energy to interactions with small water droplets. Low-pitched notes are less affected by fog and travel further, which

657-466: A snowpack can continue to generate advection fog at elevated velocities up to 80 km/h (50 mph) or more – this fog will be in a turbulent, rapidly moving, and comparatively shallow layer, observed as a few centimetres/inches in depth over flat farm fields, flat urban terrain and the like, and/or form more complex forms where the terrain is different such as rotating areas in the lee of hills or large buildings and so on. Fog formed by advection along

730-654: A warm cyclone current, forming part of the Kuroshio Current , which diverges near the western part of Japan and flows northward into the Yellow Sea at a speed of less than 0.8 km/h (0.50 mph). Southward currents prevail near the sea coast, especially in the winter monsoon period. The water temperature is close to freezing in the northern part in winter, so drift ice patches and continuous ice fields form and hinder navigation between November and March. The water temperature and salinity are homogeneous across

803-545: A year, at the beginning of May and in the middle of June. It had long been celebrated in a local festival called "Jindo Sea Parting Festival", but was largely unknown to the outside world until 1975, when the French ambassador Pierre Randi described the phenomenon in a French newspaper. The sea is rich in seaweed (predominantly kelp , Laminaria japonica ), cephalopods , crustaceans , shellfish , clams , and especially in blue-green algae which bloom in summer and contribute to

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876-436: Is a stable cloud deck which tends to form when a cool, stable air mass is trapped underneath a warm air mass. Fog normally occurs at a relative humidity near 100%. This occurs from either added moisture in the air, or falling ambient air temperature. However, fog can form at lower humidities and can sometimes fail to form with relative humidity at 100%. At 100% relative humidity, the air cannot hold additional moisture, thus

949-605: Is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth 's surface. Fog can be considered a type of low-lying cloud usually resembling stratus and is heavily influenced by nearby bodies of water, topography, and wind conditions. In turn, fog affects many human activities, such as shipping, travel, and warfare. Fog appears when water vapor (water in its gaseous form) condenses. During condensation , molecules of water vapor combine to make tiny water droplets that hang in

1022-553: Is any kind of fog where the droplets have frozen into extremely tiny crystals of ice in midair. Generally, this requires temperatures at or below −35 °C (−31 °F), making it common only in and near the Arctic and Antarctic regions. It is most often seen in urban areas where it is created by the freezing of water vapor present in automobile exhaust and combustion products from heating and power generation. Urban ice fog can become extremely dense and will persist day and night until

1095-519: Is common as a warm front passes over an area with significant snow-pack. It is most common at sea when moist air encounters cooler waters, including areas of cold water upwelling , such as along the California coast . A strong enough temperature difference over water or bare ground can also cause advection fog. Although strong winds often mix the air and can disperse, fragment, or prevent many kinds of fog, markedly warmer and humid air blowing over

1168-422: Is created by cold air passing over warmer water or moist land. It may cause freezing fog or sometimes hoar frost . This situation can also lead to the formation of steam devils , which look like their dust counterparts . Lake-effect fog is of this type, sometimes in combination with other causes like radiation fog. It tends to differ from most advective fog formed over land in that it is (like lake-effect snow )

1241-409: Is dense enough to be illuminated by light that passes through gaps in a structure or tree, but thin enough to let a large quantity of that light pass through to illuminate points further on. As a result, object shadows appear as "beams" oriented in a direction parallel to the light source. These voluminous shadows are created the same way as crepuscular rays , which are the shadows of clouds. In fog, it

1314-586: Is derived from the Shoshone word paγi̵nappi̵h , which means "cloud". In The Old Farmer's Almanac , in the calendar for December, the phrase "Beware the Pogonip" regularly appears. In his anthology Smoke Bellew , Jack London describes a pogonip which surrounded the main characters, killing one of them. The phenomenon is common in the inland areas of the Pacific Northwest, with temperatures in

1387-406: Is fog that obscures less than 60% of the sky and does not extend to the base of any overhead clouds. However, the term is usually a synonym for shallow radiation fog; in some cases the depth of the fog is on the order of tens of centimetres over certain kinds of terrain with the absence of wind. Advection fog occurs when moist air passes over a cool surface by advection (wind) and is cooled. It

1460-415: Is injected into a heated metal block which evaporates quickly. The resulting pressure forces the vapor out of a vent. Upon coming into contact with cool outside air, the vapor condenses in microscopic droplets and appears as fog. Such fog machines are primarily used for entertainment applications . The presence of fog has often played a key role in historical events, such as strategic battles. One example

1533-447: Is not of the "frostless" or "frost-free" type. The term "freezing fog" may also refer to fog where water vapor is super-cooled , filling the air with small ice crystals similar to very light snow. It seems to make the fog "tangible", as if one could "grab a handful". In the western United States , freezing fog may be referred to as pogonip . It occurs commonly during cold winter spells, usually in deep mountain valleys. The word pogonip

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1606-405: Is often referred to as tule fog . Sea fog (also known as haar or fret ) is heavily influenced by the presence of sea spray and microscopic airborne salt crystals. Clouds of all types require minute hygroscopic particles upon which water vapor can condense. Over the ocean surface, the most common particles are salt from salt spray produced by breaking waves. Except in areas of storminess,

1679-410: Is relatively low, at 30 ‰ in the north to 33–34‰ in the south, dropping to 26‰ or lower near the river deltas. In the southwest monsoon season (June to August) the increased rainfall and runoff further reduce the salinity of the upper sea layer. Water transparency increases from about 10 meters (33 ft) in the north up to 45 meters (148 ft) in the south. Tides are semidiurnal, i.e. rise twice

1752-437: Is solid objects that cast shadows. Sound typically travels fastest and farthest through solids, then liquids, then gases such as the atmosphere. Sound is affected during fog conditions due to the small distances between water droplets, and air temperature differences. Though fog is essentially liquid water, the many droplets are separated by small air gaps. High-pitched sounds have a high frequency, which in turn means they have

1825-520: Is sometimes also considered a marginal sea of the Atlantic. (coast-wise from north to south) (from east to west) While all other seas in the world are defined at least in part by land boundaries, there is only one sea which is defined only by ocean currents: Entities called "seas" which are not divisions of the World Ocean are not included in this list. Excluded are: Fog Fog

1898-662: Is the 1776 Battle of Long Island when American General George Washington and his command were able to evade imminent capture by the British Army, using fog to conceal their escape. Another example is D-Day (6 June 1944) during World War II , when the Allies landed on the beaches of Normandy, France during fog conditions. Both positive and negative results were reported from both sides during that battle, due to impaired visibility. Under "[ ^ "Federal Meteorological Handbook Number 1: Chapter 8 – Present Weather" (PDF). Office of

1971-413: Is why foghorns use a low-pitched tone. A fog can be caused by a temperature inversion where cold air is pooled at the surface which helped to create the fog, while warmer air sits above it. The inverted boundary between cold air and warm air reflects sound waves back toward the ground, allowing sound that would normally radiate out escaping into the upper atmosphere to instead bounce back and travel near

2044-559: The Seeland area, in late autumn and winter. Other notably foggy areas include coastal Chile (in the south); coastal Namibia ; Nord, Greenland ; and the Severnaya Zemlya islands. Redwood forests in California receive approximately 30–40% of their moisture from coastal fog by way of fog drip . Change in climate patterns could result in relative drought in these areas. Some animals, including insects, depend on wet fog as

2117-684: The silt -ridden water discharged from major rivers. The innermost bay of northwestern Yellow Sea is called the Bohai Sea (previously Gulf of Zhili / Beizhili ), into which flow some of the most important rivers of northern China , such as the Yellow River (through Shandong province and its capital Jinan ), the Hai River (through Beijing and Tianjin ) and the Liao River (through Liaoning province). The northeastern extension of

2190-542: The 10 to 30 °F (−12 to −1 °C) range. The Columbia Plateau experiences this phenomenon most years during temperature inversions , sometimes lasting for as long as three weeks. The fog typically begins forming around the area of the Columbia River and expands, sometimes covering the land to distances as far away as La Pine, Oregon , almost 150 miles (240 km) due south of the river and into south central Washington. Frozen fog (also known as ice fog )

2263-442: The California coastline is propelled onto land by one of several processes. A cold front can push the marine layer coast-ward, an occurrence most typical in the spring or late fall. During the summer months, a low-pressure trough produced by intense heating inland creates a strong pressure gradient, drawing in the dense marine layer. Also, during the summer, strong high pressure aloft over the desert southwest, usually in connection with

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2336-504: The Chinese, Korean and Japanese ships for centuries. Especially rich in fish are the bottom layers. About 200 fish species are exploited commercially, especially sea bream , croakers , lizard fishes , prawns , cutlassfish , horse mackerel , squid, eel , filefish , Pacific herring , chub mackerel , flounder and jellyfish. The intensity of fishing has been gradually increasing for China and Korea and decreasing for Japan. For example,

2409-694: The East Sea, South Sea, and West Sea (officially known as the Yellow Sea), respectively. Major islands of the sea include Anmado , Baengnyeongdo , Daebudo , Deokjeokdo , Gageodo , Ganghwado , Hauido , Heuksando , Hongdo , Jejudo , Jindo , Muuido , Sido , Silmido , Sindo , Wando , Yeongjongdo and Yeonpyeongdo (all in South Korea). The area has cold, dry winters with strong northernly monsoons blowing from late November to March. Average January temperatures are −10 °C (14 °F) in

2482-504: The Korea Bay ( Yalu River ). These deposits, together with sand storms are responsible for the yellowish colour of the water referenced in the sea's name. The sea annually receives so much sand and silt from rivers such as the Yellow River , that it actually turns into a golden-yellow colour. The seas surrounding Korea, which occupy a corner of Northeast Asia, border the "island nation" from the east, south, and west. Korea has named these

2555-622: The North and South Korean demarcation line. A buffer zone was also created in the Yellow Sea's Northern Limit Line (NLL). Marginal sea There are several terms used for bulges of ocean that result from indentations of land, which overlap in definition, and which are not consistently differentiated: Many features could be considered to be more than one of these, and all of these terms are used in place names inconsistently; especially bays, gulfs, and bights, which can be very large or very small. This list includes large areas of water no matter

2628-481: The Soviet Union with support from Japan have been major drivers of population decline. Species that reside in the area today include spotted seals , and cetaceans such as minke whales , killer whales , false killer whales , and finless porpoises , but nonetheless all the remnants of species listed could be in very small numbers. Historically, large whales were very abundant either for summering and wintering in

2701-496: The United Kingdom, a visibility of less than 5 km (3.1 mi) but greater than 999 m (3,278 ft) is considered to be mist if the relative humidity is 95% or greater; below 95%, haze is reported. Fog forms when the difference between air temperature and dew point is less than 2.5  °C (4.5  °F ). Fog begins to form when water vapor condenses into tiny water droplets that are suspended in

2774-492: The Yellow Sea Large Marine Ecosystem. Declines of biodiversity, fisheries and ecosystem services in the Yellow Sea are widespread. The tidal flats of the Yellow Sea are considered endangered. On 1 November 2018, officials from South Korea's Ministry of National Defense confirmed that "peace zones" had been established by the North and South Korean militaries in the Yellow Sea area that touches

2847-535: The Yellow Sea are Incheon , Gunsan and Mokpo , and that for North Korea is Nampho , the outport of Pyongyang . The Bohai Train Ferry provides a shortcut between the Liaodong Peninsula and Shandong . A major naval accident occurred on 24 November 1999 at Yantai , Shandong , China when the 9,000-ton Chinese ferry Dashun caught fire and capsized in rough seas. About 300 people were killed, making it

2920-769: The Yellow Sea is called the Korea Bay , into which flow the Yalu River , the Chongchon River and the Taedong River . The International Hydrographic Organization defines the limits of the Yellow Sea ("Hwang Hai") as follows: The Yellow Sea is separated from the Sea of Japan by the boundary from the southern end of Haenam Peninsula in Jeollanamdo to Jeju Island and divided into the East China Sea by

2993-452: The Yellow Sea. The southern part of the Yellow Sea, including the entire west coast of Korea , contains a 10 km-wide (6.2 mi) belt of intertidal mudflats , which has the total area of 2,850 km (1,100 sq mi) and is maintained by 4–10 m (13–33 ft). Those flats consist of highly productive sediments with a rich benthic fauna and are of great importance for migratory waders and shorebirds. Surveys show that

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3066-630: The Yellow and Bohai Seas. For example, a unique population of resident fin whales and gray whales were historically presented, or possibly hosted some North Pacific right whales and Humpback whales (3 whales including a cow calf pair was observed at Changhai County in 2015) year-round other than migrating individuals, and many other migratory species such as Baird's beaked whales . Even blue whales , Japanese sea lions , dugongs (in southern regions only), and leatherback turtles used to breed or migrate into Yellow and Bohai seas. Spotted seals are

3139-442: The air will become supersaturated if additional moisture is added. Fog commonly produces precipitation in the form of drizzle or very light snow. Drizzle occurs when the humidity attains 100% and the minute cloud droplets begin to coalesce into larger droplets. This can occur when the fog layer is lifted and cooled sufficiently, or when it is forcibly compressed from above by descending air. Drizzle becomes freezing drizzle when

3212-595: The air. Sea fog , which shows up near bodies of saline water , is formed as water vapor condenses on bits of salt. Fog is similar to, but less transparent than, mist . The term fog is typically distinguished from the more generic term cloud in that fog is low-lying, and the moisture in the fog is often generated locally (such as from a nearby body of water, like a lake or ocean, or from nearby moist ground or marshes ). By definition, fog reduces visibility to less than 1 km (0.62 mi), whereas mist causes lesser impairment of visibility. For aviation purposes in

3285-518: The air. Some examples of ways that water vapor is condensed include wind convergence into areas of upward motion; precipitation or virga falling from above; daytime heating evaporating water from the surface of oceans, water bodies, or wet land; transpiration from plants; cool or dry air moving over warmer water; and lifting air over mountains. Water vapor normally begins to condense on condensation nuclei such as dust, ice, and salt in order to form clouds. Fog, like its elevated cousin stratus ,

3358-454: The appearance of haze to almost zero visibility. Many lives are lost each year worldwide from accidents involving fog conditions on the highways, including multiple-vehicle collisions . The aviation travel industry is affected by the severity of fog conditions. Even though modern auto-landing computers can put an aircraft down without the aid of a pilot, personnel manning an airport control tower must be able to see if aircraft are sitting on

3431-499: The area is the single most important site for migratory birds on northward migration in the entire East Asian – Australasian Flyway , with more than 35 species occurring in internationally significant numbers. Two million birds, at minimum, pass through at the time, and about half that number use it on southward migration. About 300,000 migrating birds were transiting annually only through the Saemangeum tidal flat area. This estuary

3504-544: The boundary from the west end of Jeju Island to the Yangtze River estuary. The Yellow Sea, excluding the Bohai, extends by about 960 km (600 mi) from north to south and about 700 km (430 mi) from east to west; it has an area of approximately 380,000 km (150,000 sq mi) and a volume of about 17,000 km (4,100 cu mi). Its depth is only 44 m (144 ft) on average, with

3577-495: The classification of this ecosystem as endangered . In addition to land reclamation , the Yellow Sea ecosystem is facing several other serious environmental problems. Pollution is widespread and deterioration of pelagic and benthic habitat quality has occurred, and harmful algal blooms frequently occur. Invasion of introduced species are having a detrimental effect on the Yellow Sea environment. There are 25 intentionally introduced species and 9 unintentionally introduced species in

3650-514: The coastline as condensation competes with evaporation, a phenomenon that is typically noticeable by beachgoers in the afternoon. Another recently discovered source of condensation nuclei for coastal fog is kelp seaweed. Researchers have found that under stress (intense sunlight, strong evaporation, etc.), kelp releases particles of iodine which in turn become nuclei for condensation of water vapor, causing fog that diffuses direct sunlight. Sea smoke , also called steam fog or evaporation fog ,

3723-475: The depth. The southern waters are warmer at 6–8 °C (43–46 °F). In spring and summer, the upper layer is warmed up by the sun and diluted by the fresh water from rivers, while the deeper water remains cold and saline. This deep water stagnates and slowly moves south. Commercial bottom-dwelling fishes are found around this mass of water, especially at its southern part. Summer temperatures range between 22 and 28 °C (72 and 82 °F). The average salinity

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3796-399: The destruction of more than 60% of tidal wetlands around the Yellow Sea coastline in approximately 50 years. Rapid coastal development for agriculture , aquaculture and industrial development are considered the primary drivers of coastal destruction in the region. This degree of loss of area, widespread pollution, algal blooms and declines of invertebrate and vertebrate fauna have resulted in

3869-424: The dew point, forming fog. In perfect calm, the fog layer can be less than a meter thick, but turbulence can promote a thicker layer. Radiation fog occurs at night and usually does not last long after sunrise, but it can persist all day in the winter months especially in areas bounded by high ground. Radiation fog is most common in autumn and early winter. Examples of this phenomenon include tule fog . Ground fog

3942-411: The front passes. Hail fog sometimes occurs in the vicinity of significant hail accumulations due to decreased temperature and increased moisture leading to saturation in a very shallow layer near the surface. It most often occurs when there is a warm, humid layer atop the hail and when wind is light. This ground fog tends to be localized but can be extremely dense and abrupt. It may form shortly after

4015-404: The hail falls; when the hail has had time to cool the air and as it absorbs heat when melting and evaporating. Freezing fog occurs when liquid fog droplets freeze to surfaces, forming white soft or hard rime ice . This is very common on mountain tops which are exposed to low clouds. It is equivalent to freezing rain and essentially the same as the ice that forms inside a freezer which

4088-402: The most common areas of breaking waves are located near coastlines, hence the greatest densities of airborne salt particles are there. Condensation on salt particles has been observed to occur at humidities as low as 70%, thus fog can occur even in relatively dry air in suitable locations such as the California coast. Typically, such lower humidity fog is preceded by a transparent mistiness along

4161-426: The north and 3 °C (37 °F) in the south. Summers are wet and warm with frequent typhoons between June and October. Air temperatures range between 10 and 28 °C (50 and 82 °F). The average annual precipitation increases from about 500 mm (20 in) in the north to 1,000 mm (39 in) in the south. Fog is frequent along the coasts, especially in the upwelling cold-water areas. The sea has

4234-408: The only resident species of seal in the Yellow Sea. A sanctuary for these seals is situated at Baengnyeongdo , which is also known for its finless porpoises . Great white sharks have also been known to prey on seals in the area. The coasts of the Yellow Sea are very densely populated, at approximately 250 inhabitants per square kilometer (650/sq mi). The sea waters had been used for fishing by

4307-433: The pressure is high and conversely may expand upwards when the pressure above it is lowering. Fog can form multiple ways, depending on how the cooling occurred that caused the condensation. Radiation fog is formed by the cooling of land after sunset by infrared thermal radiation in calm conditions with a clear sky. The cooling ground then cools adjacent air by conduction , causing the air temperature to fall and reach

4380-411: The production volumes for China rose from 619,000 tonnes in 1985 to 1,984,400 tonnes in 1996. All species are overfished, however, and while the total catchments are rising, the fish population is continuously declining for most species. Navigation is another traditional activity in the Yellow Sea. The main Chinese ports are Dalian , Tianjin , Qingdao and Qinhuangdao . The major South Korean ports on

4453-678: The runway awaiting takeoff. Safe operations are difficult in thick fog, and civilian airports may forbid takeoffs and landings until conditions improve. A solution for landing returning military aircraft developed in World War II was called Fog Investigation and Dispersal Operation (FIDO). It involved burning enormous amounts of fuel alongside runways to evaporate fog, allowing returning fighter and bomber pilots sufficient visual cues to safely land their aircraft. The high energy demands of this method discourage its use for routine operations. Shadows are cast through fog in three dimensions. The fog

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4526-467: The same way as stratus cloud near a front when raindrops, falling from relatively warm air above a frontal surface, evaporate into cooler air close to the Earth's surface and cause it to become saturated. The water vapor cools and at the dewpoint it condenses and fog forms. This type of fog can be the result of a very low frontal stratus cloud subsiding to surface level in the absence of any lifting agent after

4599-415: The sea travels inland but suddenly meets an area of hot air. This causes the water particles of fog to shrink by evaporation, producing a "transparent mist". Garua fog is nearly invisible, yet it still forces drivers to use windshield wipers because of condensation onto cooler hard surfaces. Camanchaca is a similar dense fog. Depending on the concentration of the droplets, visibility in fog can range from

4672-520: The sea, but may increase to more than 5.6 km/h (3.5 mph) near the coasts. The fastest tides reaching 20 km/h (12 mph) occur in the Myeongnyang Strait between Jindo Island and the Korean Peninsula. The tide-related sea level variations result in a land pass 2.9 km (1.8 mi) long and 10–40 meters (33–131 ft) wide opening for approximately an hour between Jindo and Modo islands. The event occurs about twice

4745-506: The summer monsoon , produces a south to southeasterly flow which can drive the offshore marine layer up the coastline; a phenomenon known as a "southerly surge", typically following a coastal heat spell. However, if the monsoonal flow is sufficiently turbulent, it might instead break up the marine layer and any fog it may contain. Moderate turbulence will typically transform a fog bank, lifting it and breaking it up into shallow convective clouds called stratocumulus . Frontal fog forms in much

4818-425: The surface. A temperature inversion increases the distance that lower frequency sounds can travel, by reflecting the sound between the ground and the inversion layer. Particularly foggy places include Hamilton, New Zealand and Grand Banks off the coast of Newfoundland (the meeting place of the cold Labrador Current from the north and the much warmer Gulf Stream from the south). Some very foggy land areas in

4891-506: The temperature at the surface drops below the freezing point. The thickness of a fog layer is largely determined by the altitude of the inversion boundary, which in coastal or oceanic locales is also the top of the marine layer , above which the air mass is warmer and drier. The inversion boundary varies its altitude primarily in response to the weight of the air above it, which is measured in terms of atmospheric pressure. The marine layer, and any fog-bank it may contain, will be "squashed" when

4964-425: The temperature rises. It can be associated with the diamond dust form of precipitation, in which very small crystals of ice form and slowly fall. This often occurs during blue sky conditions, which can cause many types of halos and other results of refraction of sunlight by the airborne crystals. Ice fog often leads to the visual phenomenon of light pillars . Up-slope fog or hill fog forms when winds blow air up

5037-470: The term used in the name. The largest terrestrial seas, in decreasing order of area, are: Seas may be considered marginal between ocean and land, or between oceans in which case they may be treated as marginal parts of either. There is no single ultimate authority on the matter. (clockwise from 180°) In addition to the marginal seas listed in the three subsections below, the Arctic Ocean itself

5110-414: The water color (see image above). For example, the seaweed production in the area was as high as 1.5 million tonnes in 1979 for China alone. The abundance of all these plant and animal species increases toward the south and indicates a high sea productivity, accounting for the diversity of fish species and high fish yield from the sea. Several species of goby new to science have been discovered recently in

5183-609: The world include Argentia (Newfoundland) and Point Reyes (California), each with over 200 foggy days per year. Even in generally warmer southern Europe, thick fog and localized fog are often found in lowlands and valleys, such as the lower part of the Po Valley and the Arno and Tiber valleys in Italy; Ebro Valley in northeastern Spain; as well as on the Swiss plateau , especially in

5256-558: The worst maritime incident in China. Oil exploration has been successful in the Chinese and North Korean portions of the sea, with the proven and estimated reserves of about 9 and 20 billion tonnes, respectively. However, the study and exploration of the sea is somewhat hindered by insufficient sharing of information between the involved countries. China initiated collaborations with foreign oil companies in 1979, but this initiative declined later. A major oil spill occurred on 16 July 2010 when

5329-504: Was however dammed by South Korea in 1991–2006 that resulted in drying off the land. Land reclamation also took 65% of the intertidal area (of China, North Korea and South Korea) between the 1950s and 2002, and as of 2005 there were plans to reclaim a further 45%. Populations of oceanic megafauna , such as marine mammals , sea turtles , and larger fish, have decreased in modern times, not only due to pollution but also due to hunting. Japanese industrial whaling and illegal mass operations by

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