1961-2020年ENSO事件下黑龙江省盛夏降水异常大尺度环流成因分析  

The cause analysis of large-scale circulation of mid-summer precipitation anomalies in Heilongjiang Province under ENSO events in 1961-2020

作　　者：石红艳[1] 潘华盛[2] 杨宁 孙琪[2] SHI Hongyan;PAN Huasheng;YANG Ning;SUN Qi(Shuangyashan Meteorological Bureau,Shuangyashan 155100,China;Heilongjiang Meteorological Observatory,Harbin 150030,China;Heilongjiang Meteorological Service Center,Harbin 150036,China)

机构地区：[1]双鸭山市气象局,黑龙江双鸭山155100 [2]黑龙江省气象台,黑龙江哈尔滨150030 [3]黑龙江省气象服务中心,黑龙江哈尔滨150036

出　　处：《自然灾害学报》2022年第4期125-133,共9页Journal of Natural Disasters

基　　金：中央引导地方科技发展专项(ZY18C12)。

摘　　要：利用1961-2020年黑龙江省盛夏(7、8月)降水量、NCAR/NCEP再分析高度场和Nino3.4 SST资料,采用定义亚洲环流/Ⅰ型,即ACⅠ西风环流指数分析,相关计算、高度场及物理量场合成等方法,分析ENSO事件下盛夏遥相关形势及与降水异常大尺度环流关系。结果表明:春、盛夏Nino3.4 SST为暖(冷)位相时,盛夏500 hPa高度场易引起西高(低)东低(高)或两高(低)一低(高)波列形式,ACⅠ环流指数正(负)值明显。揭示出降水异常主要受Nino3.4 SST遥相关与ACⅠ环流共同影响。降水偏多,高空200 hPa急流轴位于42°N,急流中心区出口左前方,低层气压降低,利于东北低涡发展;850 hPa风场南支急流和日本海急流输送大量水汽进入低涡;高低纬系统相互作用,北部冷气流与南部季风气流交绥有利于降水加强;黑龙江省区域整层垂直上升气流为多水提供了动力条件。Using the midsummer(July and August)precipitation in Heilongjiang Province from 1961 to 2020,NCAR/NCEP reanalysis height field and Nino3.4 SST data,applying the methods of defined Asian circulation/Ⅰ type,which is ACI westerly circulation index analysis,correlation calculation,height field and physical quantity field synthesis,etc,the mid-summer teleconnection situation under the ENSO event and its relationship with the precipitation anomalous large-scale circulation are analyzed.The results show that if the spring and summer Nino3.4 SST is in the warm(cold)phase,it often causes the west high(low)east low(high)or two high(low)one low(high)wave train situation,ACI index the positive(negative)value is obvious. It is pointed out that the precipitation anomaly is mainly caused by the combined effect of the Nino3.4 SST teleconnections and the westerly circulation. It also reveals that in the mid-summer more water years the high-altitude 200 hPa jet stream axis is located at 42°N. In the left front of the exit of the jet stream center,the lower pressure decreases,which is favorable for the development of the northeast vortex. The 850 hPa wind field,the south branch jet stream and the Japan sea jet stream,a large amount of water vapor is transported into the vortex. The interaction of high and low latitude systems Cross-sui between the northern cold air flow and the southern monsoon air flow is beneficial to the stronger of precipitation. The entire vertical updraft airflow over the Heilongjiang region provides the dynamic conditions for more precipitation.

关 键 词：ENSO事件 盛夏降水异常 大尺度环流成因 物理量分析 

分 类 号：P434[天文地球—大气科学及气象学] X43[环境科学与工程—灾害防治]