1月份黑潮区域海温异常与我国夏季降水的关系

Relation between January Kuroshio SSTA and Summer Rainfall in China

分析了1月份黑潮区域海表温度异常与我国夏季(6—8月平均)降水的相关关系及其与夏季东亚大气环流的关系。结果表明:1月份黑潮区域海温偏高(低)时,乌拉尔山附近和雅库茨克附近的阻高加强(减弱),在这两个阻高之间的低压槽加深(减弱),西北太平洋副热带高压加强(减弱)、西伸(东撤),亚洲夏季风明显偏弱(强),导致副热带高压西侧的暖湿气流输送到长江中下游地区(我国北方地区),从而使长江中下游地区的夏季降水增多(减少)。

The relationship is analyzed of January Kuroshio Region SSTA with summer precipitation in China and general circulation over East Asia.Results indicate that in the higher(lower) Kuroshio SSTA years,the blocking highs over the Ural mountains and Yakutsk become stronger(weaker),the low pressure trough between the two blocking highs turns deeper(shallower).At the same time,the Western Pacific subtropical high strengthens and stretches westwards(withdraws eastwards) and the Asian summer monsoon is obviously stronger(weaker).As a result,the confluence region of the cold/dry air from mid-high latitudes and the warm/wet air from the west of subtropical high locates at the mid-lower reaches of the Yangtze River(North China) and the summer rainfall in the above districts increases(decreases) correspondly.