The influence of the Galápagos Islands on tropical temperatures, currents and the generation of tropical instability waves

Details The influence of the Galápagos Islands on tropical temperatures, currents and the generation of tropical instability waves The influence of the Galápagos Islands on tropical temperatures, currents and the generation of tropical instability waves

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3115308e&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 15, CiteID L15308

Physics

7

Oceanography: General: Equatorial Oceanography, Oceanography: Physical: General Circulation, Oceanography: General: Numerical Modeling, Oceanography: General: Climate And Interannual Variability (3309), Oceanography: General: Upwelling And Convergences

Scientific paper

The Galápagos Islands provide a topographic barrier for the Southern Equatorial Current (SEC) and the Equatorial Undercurrent (EUC). An island wake effect can be diagnosed from the difference of an ocean general circulation model simulation which includes the Galápagos Islands and one which ignores their presence. Cold thermocline water upwells on the western side of the islands, and only during boreal winter season these cold waters can linger around the Islands at a depth of about 80 m and affect the far eastern equatorial Pacific surface waters. This effect is partly offset by the westward transport of cold surface waters by the SEC which creates a wake on the western side of the Islands. It is furthermore shown that changes in horizontal current shear, induced by the presence of the Galápagos Islands modify the generation of tropical instability waves and lead to a basin scale SST anomaly pattern.

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