Topic 12 El Niño. GEOL 2503 Introduction to Oceanography. El Ni o. A disruption of the ocean-atmosphere system in the tropical Pacific Has important consequences for weather around the globe Frequently occurs around Christmas. Normal conditions. Strong trrade winds-.
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Topic 12El Niño
Introduction to Oceanography
Strong trrade winds-
El Niño—large pool of warm surface water in western Pacific
La Niña—so much upwelling of cold water in eastern Pacific that it spreads to west, cooling sea surface temperatures
El Niño condition: departures from normal
El Niño and La Niña and the Asian monsoons. When surface temperatures in the eastern equatorial Pacific are warmer than usual (an El Niño event), heavy rains hit East Africa and droughts beset India, Indonesia, and Australia. When ocean conditions flip-flop (a La Niña), so do rainfall patterns across Asia. From http://www.whoi.edu/oceanus/v2/article/images.do?id=53506
ENSO—note the movement of the low pressure center
Pressure differences between Tahiti and Darwin, Australia
Coupled Ocean-Atmosphere Circulation
Non El Niño
To view this animation and others, visit the TAO/TRITON data display page at www.pmel.noaa.gove/tao/jsdisplay/ani/html.
Deploying a CTD array