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Based on the Coupled Model Inter-comparison Project (CMIP5) coordinated experiments simulated by the IAP Flexible Global Ocean-Atmosphere-Land System Model (FGOALS), the properties of the East Asian Westerly Jet (EAWJ) during the Meiyu season have been investigated with the using statistical analysis, kinetic and thermodynamic methods. FGOALS can well capture the land and sea patterns of the EAWJ during the Meiyu period, which is that patterns of the EAWJ mainly core divided by the borderline of 120°E. Comparison with the NCEP/NCAR reanalysis, the EAWJ simulated by the FGOALS model during the Meiyu period exists some biases, which are caused due to weaken of the simulated meridional temperature gradient at the middle and upper troposphere and decrease of the Tibetan Plateau heating, then lead to the corresponding south Asian high weaken. The position and intensity of the EAWJ in the early summer is closely associated with the spatial distribution and intensity of heavy precipitation in the middle and lower reaches of the Yangtze River. The position of the simulated EAWJ is obviously more northward and westward, and its intensity is greatly weaker, insulted that the Meiyu precipitation amount becomes less, especially in the lower reach of the Yangtze River.

Analysis of the FGOALS Simulation on East Asian Westerly Jet in CMIP5 during the Meiyu Season