Diurnal warming in the tropical Pacific and its interannual variability

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Oceanography: General: Marginal And Semi-Enclosed Seas, Oceanography: Physical: Air/Sea Interactions (0312, 3339), Oceanography: Physical: Upper Ocean And Mixed Layer Processes

Scientific paper

Analyses of satellite-derived diurnal sea surface warming of the equatorial Pacific basin from 1996 through 2000 indicate that there is, in addition to seasonal changes, an east-west dipole. For roughly half the year, the western (eastern) Pacific experiences enhanced (decreased) diurnal warming: the opposite is true for the other six months. La Niña conditions in 1998 through 1999 affected the strength (but not the overall sign) of the dipole. Simple analyses using a comprehensive turbulent model indicate it is important to account for diurnal warming since the SST change over a day depends on the upper ocean changes due to diurnal warming. Since the tropical Pacific SST and east-west SST gradient is of interest to ENSO processes, ocean models that do not incorporate diurnal warming may overestimate mixing-induced cooling and the east-west SST gradient.

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