Abstract
The East Asian westerly jet (EAJ) plays a crucial role in affecting the East Asian summer rainfall (EASR). Therefore, evaluations of EAJ simulations are vital for improving the understanding and pr...
Highlights
The East Asian westerly jet (EAJ) in the upper troposphere is an important component of the East Asian summer (June–July–August) monsoon
The results show that almost all CMIP6 models simulate the observed summer U200 reasonably well, except for several models (e.g. CNRM-CM6-1, CNRM-ESM2-1, and IPSL-CM6A-LR) that decelerate the zonal wind speed along the EAJ
The results suggest that the CMIP6 models generally capture the basic spatial features of the climatological U200
Summary
The East Asian westerly jet (EAJ) in the upper troposphere is an important component of the East Asian summer (June–July–August) monsoon. Evaluations of the current EAJ simulations by coupled atmosphere-ocean general circulation models (AOGCMs) are vital to improve the understanding and projecting climate change in East Asia. Several studies have evaluated the ability of models to represent the observed EAJ climatology, location, intensity, and interannual variability. By analyzing the output of the Community Climate Model Version 3, Zhang and Guo (2005) found a large bias in the simulated intensity and location of the EAJ, which caused unreasonable maximum precipitation to be simulated over East Asia. The output data provide an opportunity to estimate the abilities of these new AOGCMs to simulate the EAJ, which is the motivation for the present study. We evaluate the abilities of the CMIP6 models to simulate the summer EAJ and attempt to determine whether they exhibit improvements in comparison with the CMIP5 models.
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