The relationship between the Indian Ocean Dipole(IOD) and autumn rainfall in West China was examined statistically. The results show as the seasonal lock of IOD, there is a significantly correlation between the Indian Ocean Dipole and the autumn rainfall in West China: positive correlation develops in spring and summer, and stable in autumn, it is consistent with the delays associated in summer, but the correlation weakens and inverse in early winter. During the occurrence of positive IOD episode, the southwest(cyclonic) anomalies in the middle(lower) troposphere over West China, and the equatorial easterly wind anomaly. These circulation anomalies are related to the above normal precipitation in West China. Moreover, during the occurrence of positive IOD episode, most areas of Huaxi are moisture divergence in winter and spring, but northeastern Sichuan, Guizhou and Chongqing are moisture convergence in summer and autumn, and the water vapor transport relying on the southwest air in Bay of Bengal and easterlies outside the Western Pacific subtropical. In positive IOD episode, OLR increased. The positive phase of the summer IOD provides a potential valuable signal for predicting the autumn precipitation in West China, and the positive phase of the autumn IOD play the role of continuation of development in autumn rainfall.
[1]Saji N H,Goswami B N,Vinayachandran P N,et al. A dipole mode in the tropical Indian Ocean[J]. Nature,1999,401(23):360-363.
[2]WebsterP J,Magana V O,Palmer T N,et al. Monsoons:processes,predictability,and the prospects for prediction[J]. J Geophys Res,1998,29(6):14451-1451.
[3]Anderson,D,Extremes in the Indian Ocean[J]. Nature,1999(401):356-360.
[4]Vinayachandran P N,Saji N H,Yamagata T. Response of the equatorial India Ocean to an unusual wind event during 1994[J]. Geophys Res Lett,1999,26:1613-1615.
[5]Behera S,K,Krishnan S,Yamagata T,Unusual ocean-atmosphere conditions in the tropical Indian Ocean during 1994[J]. Geophys Res Lett,1999,26:3001-3004.
[6]李崇银,穆明权. 赤道印度洋海温偶极子型振荡及其气候影响[J]. 大气科学,2001,25(4):433-443.
[7]李琰,王亚非,魏东. 前期热带太平洋、印度洋海温异常对长江流域及以南地区6月降水的影响[J]. 气象学报,2007,65(3):393-405.
[8]肖子牛,晏红明,李崇银. 印度洋地区异常海温的偶极振荡与中国降水及温度的关系[J]. 热带气象学报,2004,18(4):335-344.
[9]刘青春,秦宁生,李栋梁,等. 印度洋海温的偶极振荡与高原汛期降水和温度的关系[J]. 高原气象,2005,24(3):350-356.
[10]唐卫亚,孙照渤. 印度洋海温偶极振荡对东亚环流及降水的影响[J]. 南京气象学院学报,2005,28(3):316-322.
[11]刘宣飞,袁慧珍. 印度洋偶极子与中国秋季降水的关系[J].南京气象学院学报,2006,29(5):644-649.
[12]叶笃正,陶诗言,李麦村.在六月和十月大气环流的突变现象[J].气象学报,1958,29(4):249-263.
[13]高由禧,郭其蕴.我国的秋雨现象[J].气象学报,1958,29(4):264-273.
[14]高由禧. 东亚的秋高气爽[J].气象学报,1958,29(2):83-92.
[15]梁建洪. 华西秋雨的时空分布[J]. 地理科学,1989,9(1):51-59.
[16]徐桂玉,林春育. 华西秋雨特征及成因探讨[J]. 气象科学,1994,14(2):149-154.
[17]鲍媛媛,阿布力米提,李峰,等. 2001年华西秋雨时空分布特点及其成因分析[J]. 应用气象学报,2003,14(2):215-222.
[18]方建刚,白爱娟,陶建玲,等. 2003年陕西秋季连阴雨降水特点及环流条件分析[J]. 应用气象学报,2005,16(4):509-517.
[19]柳艳菊,孙冷,孙丞虎,等. 2011年秋季华西秋雨异常及成因分析[J]. 气象,2012,38(4):456-463.
[20]李莹,李维京,艾婉秀,等. 2011年华西秋雨特征及其成因分析[J]. 气象科技进展,2012,2(3):27-33.
[21]蒋竹将,马振峰,刘佳,等. 一种改进的华西秋雨指数及其气候特征[J]. 大气科学,2014,38(1):32-44.
[22]谭言科,张人禾,何金海. 热带印度洋海温的年际异常及其海气耦合特征[J]. 大气科学,2003,27(1):53-66.
[23]杨明珠,丁一汇,李维京,等. 印度洋海表温度主模态及其与亚洲夏季季风的关系[J]. 气象学报,2007,65(4):527-536.
[24]李东辉,张铭,张瑰,等. 热带印度洋偶极子发生和演变机制的数值研究[J]. 海洋科学进展,2005,23(2):135-143.
[25]方建刚,易俊莲. 2011年陕西秋季强连阴雨天气的大气环流异常特征分析[J]. 灾害学,2013,28(1):6-10.
[26]李汀,琚建华. 亚洲夏季风季节内振荡对云南主汛期降水的影响Ⅰ:云南主汛期季节内振荡特征及其传播过程[J]. 高原气象,2013,32(3):617-625,doi:10.7522/j.issn.1000-0534.2012.00060.
[27]李汀,琚建华. 亚洲夏季风季节内振荡对云南主汛期降水的影响Ⅱ:云南主汛期季节内振荡活动过程及其对MJO活动的响应[J]. 高原气象,2013,32(3):626-634,doi:10.7522/j.issn.1000-0534.2012.00061.
[28]张永莉,范广洲,周定文,等. 春季南支槽变化特征及其与降水和大气环流的关系[J]. 高原气象,2014,33(1):97-105,doi:10.7522/j.issn.1000-0534.2012.00179.
[29]王传辉,杨玮,周顺武. 2011年初夏长江中下游地区旱涝急转前后环流和水汽条件分析[J]. 高原气象,2014,33(1):210-220,doi:10.7522/j.issn.1000-0534.2012.00173.
