Change of surface flow field
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- Chinese name
- Up-down flow
- Discipline
- Geography
- Interpretation
- Upflow
- Cause
- Change of surface flow field
Due to the horizontal divergence of the surface flow field, the sea water below the surface flows vertically, which is called Upflow 。 Due to the horizontal convergence of the surface flow field, the flow of sea water falling vertically from the sea surface is called Downflow 。 Together Up-down flow 。 by Ocean circulation An important part of. Its occurrence is closely related to wind. In the Northern Hemisphere, when the wind blows for a long time in a direction parallel to the coast (on the left side of the wind direction) coriolis force Under the action of the wind, the wind drift formed by the wind makes the surface seawater leave the coast, causing the lower seawater near the shore to rise, forming an upwelling; At the place far from the coast, a downflow is formed, which flows from the lower layer to the nearshore to make up for the loss of nearshore seawater. In the southern hemisphere, the corresponding situation also occurred. The speed of upwelling varies from place to place. There are obvious upwelling in the sea areas of all oceans. When the monsoon blows along a shoreline, it will cause large upwelling. The strongest upwelling in the world is in the coastal zone east of Somalia and the Arabian Peninsula. Upwelling brings a large amount of seawater nutrients (phosphates, nitrates, etc.) to the surface in the deep water area, providing a rich diet. Therefore, most of the sea areas with significant upwelling are famous fishing grounds. 
