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The Influences of Southeastern Pacific and Tropical North Atlantic SSTs on the Double-ITCZ Bias
Source: LASG    Viewed:  time(s)    Time: 2016-9-10
 Dr. Fengfei Song
Scripps Institution of Oceanography, UC San Diego, USA
16:00 pm,9 September,2016
No.303,Keyan Building


The double-intertropical convergence zone (ITCZ) is a long-standing bias in the climatology of coupled general circulation models (CGCMs). The southeastern Pacific (SEP) sea surface temperature (SST) warm bias and tropical North Atlantic (TNA) SST cold bias are also evident in many CGCMs. The role of SEP and TNA SSTs on the double-ITCZ is investigated by prescribing the observed SEP and TNA SSTs in the Community Earth System Model version 1 (CESM1). When the SEP SST is prescribed, both the double-ITCZ and dry equator problems are significantly improved, mainly due to the reduction of the spurious southern ITCZ. When the TNA SST is prescribed, the northern ITCZ is significantly improved, mainly in the boreal spring. When both TNA and SEP SSTs are prescribed, the double-ITCZ bias can be reduced by ~68%. The detailed physical processes are also investigated.

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