山西省春播期降水时空变化及环流异常特征  

Precipitation Variations and Circulation Anomalies during Spring Sowing Period in Shanxi Province

作　　者：袁杰 魏凤英[2] 马晓玲 YUAN Jie;WEI Fengying;MA Xiaoling(Yangquan Meteorological Bureau,Yangquan 045000,China;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China)

机构地区：[1]阳泉市气象局,山西阳泉045000 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081

出　　处：《沙漠与绿洲气象》2023年第6期133-140,共8页Desert and Oasis Meteorology

基　　金：山西省气象局科研项目(SXKMSDW20195636);阳泉市重点研发项目(2019Z10)。

摘　　要：利用山西省72个国家气象站1961-2020年4-5月的降水量资料、NECP/NCAR月平均再分析资料和UKMO HADISST1海表温度资料,采用EOF、气候倾向率、滑动平均、小波分析、合成分析等方法,对春播期降水的时空变化及环流异常特征进行分析。结果表明:(1)山西省春播期降水量场主要有全省一致型、南北差异型,以及南北与中部差异型3种主要模态,分别占总年数的63.3%,25%和11.7%。(2)春播期降水量的增多趋势不显著,共经历了5个气候变化阶段,并存在2~3和12~13 a的振荡周期。(3)在春播期异常多雨年,500 hPa高度场呈“东高、西低”等分布特征,850 hPa风场我国中东部地区盛行偏南气流,海平面气压场呈北高南低分布型,前冬赤道中东太平洋呈El Nino分布型,印度洋呈偶极子分布型,大西洋呈三极子分布型;而在异常少雨年,环流及海温特征则基本相反。Based on the precipitation data of 72 national meteorological stations in Shanxi province,monthly mean reanalysis data of NECP/NCAR and UKMO HADISST1 sea surface temperature data from April to May in 1961-2020,the temporal-spatial variations of precipitation and circulation anomalies features are analyzed during spring sowing period,by using EOF,climatic tendency,moving average,wavelet and composite analysis.The results show that:(1)There are three main modes of precipitation during spring sowing period in Shanxi province,which are completely consistency,northsouth distribution,north-south and central distribution type,accounting for 63.3%,25%and 11.7%respectively.(2)The increasing trend of precipitation is unobvious in spring sowing period,it experiences five variation phases and has two oscillation periods of 2-3 a and 12-13 a.(3)In the abnormal rainy years,the 850 hPa wind field exhibits prevailing southerly airflow in mid-eastern China,the 500 hPa geopotential height and sea level pressure field shows the patterns of“higher in the east and lower in the west”and“higher in the north and lower in the south”,respectively.Besides,the equatorial middle-east Pacific,Indian Ocean and Atlantic Ocean display the typical El Nino distribution,Dipole distribution and Triode distribution in early winter,respectively.However,the features of circulation and sea surface temperature are opposite in the abnormal rainless years.

关 键 词：春播期 降水 大气环流 海温 山西省 

分 类 号：P426.614[天文地球—大气科学及气象学]