福建省前汛期旱涝年前冬季500 hPa高度场特征及其与东亚冬季风的关系

Relationship between EAWM and drought/flood of former rain season in Fujian and its feature at 500hPa high

通过对1961～2001年福建前汛期降水与东亚前冬季冬季风强弱与副高强度间的相关性等统计分析表明：前冬季冬季风强（弱）年，前汛期西太平洋副高偏弱（强），福建降水偏多（少），此外，本文利用ECMWF再分析资料，对比分析了旱涝年份前冬季500hPa环流形势差异．其结果显示：旱（涝）年前冬季，东亚大槽偏弱（强），冬季风减弱（增强），副热带高压偏强（弱）。

By statistics,it is learned that there is an intimate relation between East Asian winter monsoon and the sub-tropical high over the west Pacific and the rain during former flood season in Fujian. While the winter monsoon is strong （weak） , the subtropical high during rain season strengthens （weakens） and it tends to be rainy （dry）in Fujian. Based on NCEP/NCAR daily reanalysis data, different feature of the 500hPa high fields of former winter are discussed. It shows that in the former winter of dry （rainy） rainfall season, the East- Asian trough tends to northward（ southward）, the winter monsoon is weak （strong）, and the subtropical high is strong （weak）.