upwelling along the straight from the increase in subsurface ocean currents, generated by the surface flow caused by the level of divergence.
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Introduction Introduction to the role of the formation of distribution of surface flow due to the level of divergence, the increase in vertical subsurface flow of water. On the contrary, due to the level of surface flow convergence, the vertical decline in water flow from the sea, called down stream. Increased flow and decreased flow collectively referred to as lifting flow, is an important part of ocean circulation. Which together constitute the marine and level of mobility (total) circulation. The formation of the occurrence of lifting flow is closely related with the wind. In the northern hemisphere, when the wind along the coast (on the left side of the wind direction) parallel to the longer time to Chuigua when the transfer bias to the ground under the force of the wind that formed the wind drift surface water off the coast, it caused rising sea bottom near the shore, forming a rising flow away from the shore down stream is formed, which flows from the lower shore, to compensate for the loss of coastal waters. In the Southern Hemisphere,
nike air force one low, there are corresponding to happen. The role of the typhoon,
air force one low, the typhoon center divergence surface seawater, so the lower rising sea levels, the formation of a rising flow; the edge of the typhoon to form in the drop stream. Upwelling velocity is very small, only 10-4 ~ 10-2 cm / sec, generally only from the surface and cross section contours of the distribution of water temperature, to be judged qualitatively, or under the law of conservation of mass, velocity of the radiation from the horizontal bulk value estimate. Geochemistry in the marine section (GEOSECS) in, once the carbon -14 increased the velocity of observation. The results showed that the rate of upwelling vary, for example, off the coast of California in North America increased flow velocity of only 20 meters per month, coastal Zhejiang Province,
nike air force 1 high, China increased the monthly rate of flow of 87.6 meters, while in South America, the strong upwelling West Bank Sea, upwelling speeds up to 200 meters / month. Distribution of many of the ocean waters, the upwelling are more obvious, when the monsoon Chuigua along a coastline, it will cause a large increase in flow. The world's strongest upwelling, Somalia and the Arabian Peninsula in the east of the coastal zone; China, Taiwan and Hainan Island and the East China Sea, some offshore waters, but also upwelling occurred. The leeward side of the island, stretching from Cape leeward side of the ocean, reefs around the northern hemisphere and counterclockwise flow of strong rotation, as well as the boundary of water masses, will have a local upwelling; ocean sea surface divergence, but also Most of the upwelling area. For example, in ocean waters near the equator, the role of the wind drift,
nike air force one high, the North Equatorial Current and the equatorial counter current level of divergence between, sub-layer of water rose to the sea, forming a rising flow; in Equatorial Countercurrent and South Equatorial Current in the Northern Hemisphere portion of the generated between the level of convergence, the surface water down to the sub-layer formed down stream. In addition, part of the South Equatorial Current and the southern parts of the northern hemisphere between the time it rose to the surface layer of water formed by the upwelling. The role of upwelling water to a large number of deep water nutrients (phosphate, nitrate, etc.) to the surface, providing a wealth of food, thus, upwelling waters significantly more than the famous fishing grounds. JH Ryther according to estimates in 1969, the area of upwelling sea area of only 0.1% of the world's oceans,
nike air force 1, but the world's marine fish catches accounted for half of total production. In order to study ocean productivity, in the International Decade of Ocean Exploration (1971 ~ 1980) Plan, once the focus of increased flow as one of the items. Peru's strong upwelling along the coast, making this the world famous fishing waters, while breeding a group of seabirds to fish for a living. Every few years, due to atmospheric circulation variability and other reasons,
air force 1 shoes, low-latitude warm water southward invasion, resulting in reduced where upwelling, sea surface temperature higher than normal 2 ~ 3 ° C, individual time and temperature can be high 5 ~ 6 ° C . As water temperature increases abnormally, much less plankton in sea water, using it as bait fish to a large number of dead fish-eating seabirds are starving to death en masse, and this is the rise and fall with the increase in the flow of Egyptian El Niño phenomenon. More Atlas Atlas entry Open Category: Nature, ocean, ecology, fisheries science, marine science and technology
Hybrid Mode
