Seasonal cycle of sea surface temperature and mixed layer heat budget in the tropical Pacific Ocean Academic Article uri icon

abstract

  • Climatological data derived from the Comprehensive OceanAtmosphere Data Set (COADS) combined with the climatological temperature fields from XBT observations in the tropical Pacific Ocean are used to assess the importance of various oceanic and atmospheric processes in the seasonal variation of the mixed layer temperature. The analyses indicate that in most areas of the extraequatorial oceans, where the mixed layer is deep and oceanic mixing is weak, the seasonal change in SSTs can be attributed to the net local heating received by the mixed layer. However, in other parts of the equatorial oceans, oceanic processes are found to play an important role in determining the seasonal fluctuations of the SST. In particular, in the eastern equatorial Pacific Ocean where the mixed layer is shallow, the thermalinertia of the upper ocean is reduced significantly by the intense vertical mixing so that the response of the SST is nearly in phase with the surface heating. Using the KrausTurner type of entrainment parameterization, the analyses further demonstrate that the vertical heat flux induced by the mean entrainment velocity contributes significantly to the mixed layer heat budget. Copyright 1993 by the American Geophysical Union.

published proceedings

  • Geophysical Research Letters

author list (cited authors)

  • Chang, P.

citation count

  • 29

complete list of authors

  • Chang, Ping

publication date

  • October 1993