Coupling of convective momentum transport with convective heating in global climate simulations

Xiaoqing Wu*, Liping Deng, Xiaoliang Song, Guang Jun Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The effects of convective momentum transport (CMT) on global climate simulations are examined in this study. Comparison between two sets of 20-yr (1979-98) integration using the NCAR Community Climate Model version 3 (CCM3) illustrates that the inclusion of CMT in the convection scheme systematically modifies the climate mean state over the equatorial region. The convective momentum tendencies slow down the equatorward flow at higher latitudes near the surface and weaken the equatorial convergence and convection. This reduces the convective heating and drying around the equator and produces an improved meridional distribution within the upward branch of the Hadley circulation. The major heating peak during the boreal winter is moved to south of the equator at about 10°S, which is closer to the heat budget residuals of the ECMWF reanalysis data. The responses of meridional wind to the reduced heating result in the secondary meridional circulation within the intertropical convergence zone.

Original languageEnglish (US)
Pages (from-to)1334-1349
Number of pages16
JournalJournal of the Atmospheric Sciences
Volume64
Issue number4
DOIs
StatePublished - Apr 1 2007

ASJC Scopus subject areas

  • Atmospheric Science

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