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MJO Convection and Eastward Propagation in MJOTF/GASS Models
陈桂万
中国科学院大气物理研究所LASG
Convective heating and precipitation associated with the Madden-Julian Oscillation (MJO) affect global large-scale circulation. However, quantitative evaluation of the MJO convection/precipitation and eastward propagation in global general circulation models (GCMs) has been lacking until recently. In this study, we investigate model simulations of the eastward propagation of the MJO convection in 25 GCMs participated in the MJO Task Force (MJOTF) and the GEWEX Atmospheric System Study (GASS) (MJOTF/GASS) using the large-scale precipitation tracking (LPT) method by Chen and Kerns (2020). Individual large-scale precipitation tracking systems (LPTs) and MJO events subgrouping from LPTs were identified in observation and the models. In general, LPTs produced by the models are too stationary, too weak and too small compared with those in observation. Statistical signals of the MJO are closely related to the spatial scale and strength of LPTs in the models. This study highlights the importance of reproducing the large-scale precipitation characteristics in improving the MJO simulation.