近44年内蒙古夏季降水与大气环流特征分析  

Characteristics of Summer Precipitation and Atmospheric Circulation in Inner Mongolia in Recent 44 years

作　　者：葛海燕 GE Haiyan(Chifeng Meteorological Bureau,Chifeng,Inner Mongolia 024000)

机构地区：[1]赤峰市气象局,内蒙古赤峰024000

出　　处：《农业灾害研究》2022年第3期81-83,87,共4页Journal of Agricultural Catastrophology

摘　　要：利用1971—2014年内蒙古110个站夏季降水资料、NCEP/NCAR逐月平均高度场、风场格点资料和NOAA月平均海表温度资料,采用EOF分解、蒙特卡罗统计检验、合成分析等方法,探讨了近44年内蒙古夏季降水的时空特征、夏季降水第一模态的环流特征。结果表明,近44年来内蒙古夏季降水量呈减少趋势,减少幅度23.38 mm/44 a。夏季降水偏多年500 hPa位势高度距平场欧亚范围中高纬地区自西向东为“+-+”波列分布,偏少年呈“-+-”分布,环流系统的关键区在乌拉尔山和贝加尔湖附近。影响夏季降水的环流因子众多,西太平洋副高西、AO、经纬向环流等都对降水有明显影响。850 hPa夏季降水偏多年与偏少年风场显著差异出现在我国东北的气旋性涡旋中心位置不同。Based on summer precipitation data of 110 stations in Inner Mongolia from 1971 to 2014,NCEP/NCAR monthly mean height field,wind grid data and NOAA monthly mean SST data,EOF decomposition,Monte Carlo statistical test and synthetic analysis were used.The temporal and spatial characteristics of summer precipitation and circulation characteristics of the first mode of summer precipitation in Inner Mongolia in recent 44 years were discussed.The results showed that summer precipitation in Inner Mongolia has a decreasing trend in recent 44 years,with a decreasing range of 23.38mm/44 a.The 500 hPa geopotential height anomaly field in the middle and high latitudes of Eurasia presents a“+-+”wave train distribution from west to east,and a“-+-”distribution distribution in the middle and high latitudes.The key regions of the circulation system were near ural Mountains and Lake Baikal.There were many circulation factors influencing summer precipitation,and the western Pacific Subtropical high,AO,and longitudinal-latitude circulation had obvious influence on precipitation.The significant difference between the long-year and juvenile wind fields of 850 hPa summer precipitation occurred in the different locations of the cyclonic vortex center in northeast China.

关 键 词：夏季 降水偏多(少) 空间模态 大气环流 海表温度 

分 类 号：P434.5[天文地球—大气科学及气象学]