不同季节黑潮延伸体区域海洋锋对大气的影响

The Seasonal Impacts of the Kuroshio Extension SST Front on the Atmosphere

本文依据最优插值海表面温度资料、欧洲中期数值预报中心的月平均再分析资料以及TRMM降水资料分析了不同季节黑潮延伸体区域海洋锋对大气的影响。研究表明:秋、冬、春季,在海洋锋最强位置南北两侧的大气中存在南侧上升北侧下沉的次级环流,并且上升支的强度明显强于下沉支,同时该次级环流随高度不断地向北倾斜,主要集中在对流层中低层。而在夏季,海洋锋附近大气总体表现为上升运动,并且该上升运动在高空更加显著,同时夏季在海洋锋区南侧区域对流降水的贡献最大。

The seasonal impacts of the Kuroshio Extension SST （sea surface temperature） front on the atmosphere are investigated, using the Optimal interpolation sea surface temperature, the monthly reanalysis of the precipitation from the European Center for Medium-Range Weather Forecasts, and the Tropical Rainfall Measuring Mission satellite precipitation data. The Results are as follows： in spring, autumn, and winter, a cross-frontal secondary circulation exists around the south （ascending） and north （descending） side of the strongest SST front, and the ascending is stronger than the descending; this cross-frontal secondary circulation appears mainly in middle and lower troposphere, and tilts north-ward gradually with height; while in summer, the overlying atmosphere around the SST front display ascending motion, and more prominent in the middle and upper troposphere; and the contribution of convective precipitation is most significant to the south of the SST front in summer.