沙漠与绿洲气象2024，Vol.18Issue(4)：51-58,8.DOI:10.12057/j.issn.1002-0799.2024.04.008
东北冷涡分类及其对内蒙古东部降水的影响
Classification of the Northeast Cold Vortex and Its Impact on Precipitation in Eastern Inner Mongolia
摘要
Abstract
Utilizing daily precipitation data from 119 national meteorological observation stations in Inner Mongolia during June to August from 1981 to 2022,along with NCEP/NCAR daily reanalysis data,the interannual and decadal variation characteristics of the Northeast Cold Vortex and its classification impact on precipitation in eastern Inner Mongolia were analyzed.The results indicate that the frequency of the Northeast Cold Vortex occurrences was significantly higher than the average before 1992,followed by a significant decrease until a rising trend emerged after 2003,with the past decade experiencing a higher frequency of occurrences.The Northeast Cold Vortex was classified into 10 types,among which the eastward movement of the central vortex to the northeast was identified as the most anomalous cold vortex type leading to excessive precipitation in the east,followed by the eastward movement of the central vortex as the next most anomalous type.The East Asia region exhibited a"high in the north,low in the south"circulation pattern,with eastern Inner Mongolia located in a negative potential height anomaly zone,centered in the southern part of the east.The Ushan and Ehai blocking highs were anomalously strong,as was the subtropical high,placing the eastern region of Inner Mongolia under cyclonic circulation control.Low-level moisture flux convergence,in conjunction with the low-latitude cross-equatorial flow,guided the west Pacific moisture transport to the eastern region,representing the main circulation configuration type responsible for the anomalously high precipitation in the east.关键词
内蒙古东部/东北冷涡/路径分类/降水/环流Key words
eastern Inner Mongolia/northeast cold vortex/path classification/precipitation/circulation分类
天文与地球科学引用本文复制引用
高晶,陈金琪,包福祥,王慧敏,赵艳丽..东北冷涡分类及其对内蒙古东部降水的影响[J].沙漠与绿洲气象,2024,18(4):51-58,8.基金项目
数值预报统筹研发专项(TCYF2024QH005) （TCYF2024QH005）
中国气象局复盘总结专项(FPZJ2024-021) （FPZJ2024-021）
内蒙古自治区自然科学基金项目(2023QN04005) （2023QN04005）
内蒙古自治区气象局科技创新项目(nmqxkjcx202402) （nmqxkjcx202402）
