Upward water motion bringing subsurface water toward the surface. For example, wind-driven surface divergence near the equator can be supplied by upwelling of colder water from near the thermocline. A deeper thermocline can reduce the cooling produced by a given rate of upwelling.
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Upwelling is an oceanographic process that occurs when deep, cold, nutrient-rich water rises to the surface. This phenomenon typically occurs in coastal areas or along ocean currents where winds push surface water away, allowing deeper water to replace it. Upwelling is significant for several reasons: 1. **Nutrient Supply**: The nutrient-rich waters that rise during upwelling are crucial for supporting marine life, particularly phytoplankton, which forms the basis of the marine food web.