May 13, 2019 — The following was released by NOAA Fisheries:
Great volumes of nutrient-rich water welling up from the deep ocean fuel the West Coast’s great diversity of marine life. Now scientists using satellite images, research buoys, ocean models, and other ocean monitoring tools have brought the upwelling into much sharper focus, measuring even the velocity of the water and the amount of nutrients that it delivers.
Scientists described new “upwelling indices,” which represent a breakthrough in understanding the biological engine that drives the West Coast marine ecosystem.
“Upwelling is vital to marine life along the West Coast, but the tools we were using to monitor it hadn’t changed much in almost 50 years,” said Michael Jacox, a research scientist at NOAA Fisheries’ Southwest Fisheries Science Center who developed the new indices. “Now we’re bringing state-of-the-art tools and the latest science to bear to help us understand how upwelling supports and shapes the California Current Ecosystem.”
Given the ecological importance of upwelling, scientists and managers are eager for indices that allow them to monitor its variability and understand its impacts on coastal ocean ecosystems.
Jacox, of the Southwest Fisheries Science Center and NOAA’s Earth System Research Laboratory, and other researchers from NOAA Fisheries, and the University of California at Santa Cruz, recently published the new upwelling measurements new upwelling measurements in the Journal of Geophysical Research: Oceans and the indices are also available online. Maps based on the indices reveal through color-coding where upwelling is most pronounced, such as off Cape Mendocino in California.
Upwelling occurs along certain coastlines around the world where winds and the Earth’s rotation sweep surface waters offshore, drawing deep, cold, and salty water full of nutrients up to the surface. These nutrients fuel growth of phytoplankton that form the base of the marine food web, and ultimately nourish the West Coast’s ocean ecosystem from sardines to sperm whales.