The oceanographic process where deep, cold, nutrient-rich water rises to the surface, typically driven by winds or currents. This process brings essential nutrients from the depths to surface waters.
From the verb 'upwell,' combining 'up' and 'well' (meaning to rise or flow). The term became established in oceanography in the early 20th century as scientists studied ocean circulation patterns and their effects on marine productivity.
Upwelling zones are the ocean's natural fertilizer systems - these areas cover less than 1% of ocean surface but produce about 25% of global fish catch! When deep, nutrient-rich waters rise to the sunlit surface, they trigger massive plankton blooms that support entire marine food webs, from anchovies to whales.
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