Upwelling is an oceanographic phenomenon that involves wind-driven motion of dense, cooler, and usually nutrient-rich water towards the ocean surface, replacing the warmer, usually nutrient-depleted surface water. The nutrient-rich upwelled water stimulates the growth and reproduction of primary producers such as phytoplankton.

Summer upwelling in the South China Sea and its role in regional climate variations
Evidence for upwelling of corrosive "acidified"water onto the continental shelf.
Wind-Driven Upwelling in the Southern Ocean and the Deglacial Rise in Atmospheric CO2
Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2.
Upwelling-driven nearshore hypoxia signals ecosystem and oceanographic changes in the northeast Pacific
Global climate change and intensification of coastal ocean upwelling.
Silicate regulation of new production in the equatorial Pacific upwelling
Iron-limited diatom growth and Si:N uptake ratios in a coastal upwelling regime
From the Cover: Massive nitrogen loss from the Benguela upwelling system through anaerobic ammonium oxidation
Authigenic apatite formation and burial in sediments from non-upwelling, continental margin environments