The same climatic drivers that enhance upwelling of nutrient-rich ocean waters and support of marine productivity can result in lower precipitation on land and slower tree-growth. Tree-ring chronologies helped to explain how upwelling was happening during the past 600 years. This was outlined in a recent study published in Science by an international team of scientists including David Frank of the Swiss Federal Research Institute WSL and the University of Bern's Oeschger Center.
The new study, led by Bryan Black at The University of Texas at Austin's Marine Science Institute which has appeared in the September 19th issue of the journal Science, links short-term reductions in growth and reproduction of marine animals off the California coast to increasing variability in the strength of coastal upwelling currents. The upwelling of cold, deep, nutrient-rich waters towards the sunlit ocean surface is a key process in the oceans that fuels phytoplankton blooms that ultimately support fish, seabirds, and marine mammals.
http://www.sciencedaily.com/releases/2014/11/141110083406.htm
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