El Niño and La Niña-Equatorial Pacific thermocline depth and sea surface temperature anomalies, 1986-98

Details El Niño and La Niña-Equatorial Pacific thermocline depth and sea surface temperature anomalies, 1986-98 El Niño and La Niña-Equatorial Pacific thermocline depth and sea surface temperature anomalies, 1986-98

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1051h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 6, p. 1051-1054

Physics

15

Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Oceanography: General: Equatorial Oceanography, Oceanography: Physical: El Nino, Oceanography: Physical: Upper Ocean Processes

Scientific paper

Simple models of the El Niño-Southern Oscillation (ENSO) phenomenon have provided many of our basic ideas about ENSO mechanisms. There models exhibit a range of correlation patterns between thermocline depth anomaly (Z20A) and sea surface temperature anomaly (SSTA). We use 13 years of Pacific equatorial waveguide observations to explore the relationships between Z20A and SSTA. We find significant correlation in the eastern Pacific, and in the east-central Pacific when the east-central Pacific is normal or cooler than normal. We find no correlation in the western, west-central and east-central (when warmer than normal) Pacific. It is inappropriate to attribute SSTA changes to Z20A changes. Coupled ENSO models should be reexamined in light of these observed Z20A/SSTA relationships. Analysis of ocean general circulation models suggests that progress in understanding ENSO may depend as much on understanding SSTA/wind/near-surface current relationships and processes, as upon thermocline change processes.

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