河西走廊春末夏初降水异常与大气环流及海温场关系  

Relations between precipitation anomaly in late spring and early summer in Hexi Corridor and atmospheric circulation and sea surface temperature

作　　者：王伏村 付双喜[2] 王旭东[3] 沈福 李庆玉 

机构地区：[1]甘肃省张掖市气象局,甘肃张掖734000 [2]甘肃省人工影响天气办公室,甘肃兰州730020 [3]内蒙古气象科技服务中心,内蒙古呼和浩特010051 [4]甘肃省酒泉市气象局,甘肃酒泉735000 [5]甘肃省武威市气象局,甘肃武威733000

出　　处：《干旱区地理》2014年第2期281-289,共9页Arid Land Geography

基　　金：冰雹云CINRAD/CD雷达预警及防雹作业指挥系统集成应用(CAMGJ2012M52)资助

摘　　要：使用1961—2010年NCE洲CAR逐月再分析资料、NOAA月平均海表温度资料和河西走廊月降水资料，在分析河西走廊春末夏初降水变化特征的基础上，对春末夏初降水异常的大气环流及其与早春3～4月海温场的关系进行了分析。结果表明：河西走廊春末夏初降水变化主要以全区一致型为主，存在3a、5a、10a和13～15a显著周期变化。春末夏初降水异常多年850hPa距平风场河西走廊盛行东风，散度场为辐合；500hPa欧亚中高纬度高度距平场呈“＋一＋”分布，类似负欧亚遥相关型（EU）；距平风垂直环流为印度洋上升，高原下沉、35～45°N上升的经圈环流；整层水汽通量距平场上，我国西北以东地区的东风气流有利于东部暖湿空气向西北地区输送，河西走廊为水汽辐合区；前期3～4月赤道南印度洋和赤道中东太平洋海温为大范围正异常。降水异常少年上述特征正好相反。通过3～4月海表温度与5～6月500hPa高度场相关分析表明，赤道南印度洋海温正（负）异常时，欧亚中高纬度会出现＋－＋（－＋－）的类似EU遥相关型波列，说明前期赤道南印度洋海温异常对后期中高纬度EU遥相关型有激发或增强作用，进而影响河西走廊春末夏初降水异常。Using the NCEP/NCAR reanalysis monthly data, NOAA monthly sea surface temperature data and monthly rainfall station data in the Hexi Corridor from 1961 to 2010, the variation characteristics of precipitation in late spring and early summer and relationships between precipitation anomaly and the atmospheric circulation and sea surface temperature in early spring are statistically analyzed. The results show that the variation trend of precipi- tation in late spring and early summer is consistent in the region-wide and there are significant periods of 3,5, 10, 13-15 years in time change. In positive precipitation anomaly years, characteristics of circulation and sea surface temperature are that the east wind prevails and the region-wide is under the control of convergence in the Hexi Cor- ridor at 850 hPa wind anomaly field, there was＇ ＋-＋＇ anomaly pattern in mid-high latitude over Eurasian at 500 hPa height anomaly field and this distribution is similar to negative Eurasian teleconnection pattern （EU）. Meridional cir- culation of wind anomaly is ascending over India Ocean, descending over Tibetan Plateau and ascending 35°- 45°N. The central China is under the control of the east wind at the whole layer water vapor flux anomaly field which is con- ducive to water vapor transport from eastern to northwest China and Hexi Corridor is smothered in water vapor con- vergence area. The sea surface temperature of southern equatorial India Ocean and the mid-eastern equatorial Pacif- ic in early spring is in positive anomaly. In negative precipitation anomaly years, characteristics of the atmospheric circulation and sea surface temperature are opposite. The correlation analysis of sea surface temperature in early spring and 500 hPa height in late spring and early summer the crucial role in stimulating and enhancing the mid-high possible cause of the precipitation anomaly in late spring and show that southern equatorial India Ocean SSTA plays latitude Eurasian teleconnection pattern （EU）. This is early summer

关 键 词：河西走廊 降水 大气环流 水汽输送 海表温度 

分 类 号：P426.61[天文地球—大气科学及气象学]