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An Observational Study on the Latitudes Where Wave Forcing Drives Brewer–Dobson Upwelling

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  • 1 NASA Goddard Institute for Space Studies, and Center for Climate Systems Research, Columbia University, New York, New York
  • | 2 School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York
  • | 3 Atmospheric Sciences Division, Brookhaven National Laboratory, Upton, New York
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Abstract

The 40-yr ECMWF Re-Analysis (ERA-40) data are analyzed to demonstrate that wave forcing at lower latitudes plays a crucial role in driving the tropical upwelling portion of the Brewer–Dobson circulation. It is shown that subtropical wave forcing is correlated with tropical upwelling on both intraseasonal and interannual time scales when transient waves are taken into account, and that tropical wave forcing exerts its influence on tropical upwelling via its body force on the zonal mean flow.

Corresponding author address: Tiehan Zhou, NASA Goddard Institute for Space Studies, and Center for Climate Systems Research, Columbia University, New York, NY 10025. E-mail: tz2131@columbia.edu

Abstract

The 40-yr ECMWF Re-Analysis (ERA-40) data are analyzed to demonstrate that wave forcing at lower latitudes plays a crucial role in driving the tropical upwelling portion of the Brewer–Dobson circulation. It is shown that subtropical wave forcing is correlated with tropical upwelling on both intraseasonal and interannual time scales when transient waves are taken into account, and that tropical wave forcing exerts its influence on tropical upwelling via its body force on the zonal mean flow.

Corresponding author address: Tiehan Zhou, NASA Goddard Institute for Space Studies, and Center for Climate Systems Research, Columbia University, New York, NY 10025. E-mail: tz2131@columbia.edu
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