南亚高压和西太副高位置与中国盛夏降水异常-气象科学.pdfVIP

30 4 Vo.l 30, No. 4 2010 8 SCIENT IA METEOROLOG ICA SIN ICA Aug. , 2010 , . . , 2010, 30 ( 4): 438444. Zha g Li g, Zhi X iefe.i South As ia high a d the subtrop icalwester Pacific h igh a d its relatio to them idsumm er precip itatio a om alies overCh i a. Sci e tiaM eteorologica Si ica, 2010, 30( 4) : 438444. 张 玲 智协飞 ( , 210044) 用全国 160站降水资料及ECMW F逐月再分析资料, 采用合成分析方法, 讨论了年际 变化尺度上南亚 压与西太副 纬向位置异常与盛夏降水的关系结果表明, 当南亚 压与西太 副 纬向异常重叠(分离)时, 长江中下游流域存在异常上升(下沉) 运动, 江南的广大地区存在异 常下沉(上升) 运动且当两 个 压纬向异常重叠时, 来自北印度洋及西太平洋的水汽, 在长江中 下游流域异常辐合, 降水偏多此时, 江南地区水汽通量异常辐散, 降水偏少当两 个 压纬向异 常分离时, 水汽主要来自北印度洋的西南风输送, 长江流域降水偏少, 江南地区降水偏多 P4345 A Sou th A sian high and the sub tropical western Pacific high and its relation to the m idsumm er precipitation anom alies over China Zhang L ing Z hi X iefei (K ey Laboratory of M eteorologicalD isaster of M inistry of Education, N anj ing University of Inf ormation S cience echnology, N anj ing 210044, Ch ina) Ab stract Based o themo thly precip itatio of 160 statio s i Chi a a d the ECMW F mo thly rea alyses, the relatio ship betw ee the lo gitudi al locatio a omalies of the South A sia high ( SAH ) a d the Subtrop icalW ester Pacific high ( SW PH ) a d the m idsummer precip itatio a omalies over Chi a has bee i vestigated by usi g the composite a alysis. The resu lts show thatw he the lo gitud i al locatio of the SAH ( SW PH) moves further easwt ard (w eswt ard) tha ormal, both a ticyclo es ( SAH a d SW PH ) overlap i the eastw est d irectio o the basis of i tera ual variatio , th