Seasonal migration of ITCZ precipitation across the equator: Why can't GCMs simulate it?

Details Seasonal migration of ITCZ precipitation across the equator: Why can't GCMs simulate it? Seasonal migration of ITCZ precipitation across the equator: Why can't GCMs simulate it?

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30oas12w&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 15, pp. ASC 12-1, CiteID 1824, DOI 10.1029/2003GL017198

Physics

14

Meteorology And Atmospheric Dynamics: General Circulation, Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Meteorology And Atmospheric Dynamics: Precipitation (1854), Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

The secondary meridional circulation induced by convective momentum transport (CMT) within the ascending branch of the Hadley circulation is a missing dynamical mechanism that can cause common failure of general circulation models (GCMs) in simulating seasonal migration of the intertropical convergence zone (ITCZ) precipitation maximum across the equator. This failure is manifested by the model bias that the precipitation peak remains north of the equator during November-March. The CMT-induced secondary circulation, characterized by strong downward motion along the equatorial belt and upward motion south and north of the belt, tends to modify the meridional distribution of precipitation with the strongest impacts during boreal winter and spring. A 20-year GCM simulation with the CMT parameterization successfully reproduces the observed seasonal migration of the ITCZ precipitation across the equator with the peaks near 8°N during boreal summer and near 8°S during boreal winter.

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