Upwelling associated with ENSO events

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Presentation transcript:

Upwelling associated with ENSO events Colleen McHugh

Peruvian Upwelling Easterly trade winds Sea surface is higher and warmer near Indonesia (relative to Peru) Southerly winds off the coast of Peru  Ekman transport to the left of motionupwelling

Peruvian Upwelling

ENSO Easterly trade winds will weaken in Northern Hemisphere spring and occasionally reverse direction Ocean temperatures warm in central and eastern Pacific Thermocline flattens, preventing upwelling from occurring Has major oceanic and atmospheric impacts

How ENSO affects upwelling in Peru Thermocline deepens Nutrients from deeper waters don’t reach the surface Plankton and fish that rely on these nutrients will either die or migrate Major effects on fisheries and Peruvian economy

La Nina and upwelling Trade winds strengthen Leads to cooler waters and more upwelling

Resources http://earthobservatory.nasa.gov/Features/ElNino/elnino.php http://education.nationalgeographic.com/education/encyclopedia/el-nino/?ar_a=1 http://earthobservatory.nasa.gov/Features/LaNina/ http://ww2010.atmos.uiuc.edu/(Gl)/guides/mtr/eln/upw.rxml http://www.ncdc.noaa.gov/teleconnections/enso/enso-tech.php

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