降水异常,多雨年,少雨年,大气环流," /> 降水异常,多雨年,少雨年,大气环流,"/> Abnormal precipitation,Abundant rainfall year,Scarce rainfall year,Atmospheric circulation,"/> 1961—2012年6—8月内蒙古降水异常及环流特征分析
主办单位：中国气象局沈阳大气环境研究所
国际刊号：ISSN 1673-503X
国内刊号：CN 21-1531/P
气象与环境学报

气象与环境学报 ›› 2013, Vol. 29 ›› Issue (6): 56-62.doi:

• 论　文 • 上一篇    下一篇

1961—2012年6—8月内蒙古降水异常及环流特征分析

尤莉1 程玉琴2 李卉3 塔拉4   

  1. 1.内蒙古气候中心，内蒙古 呼和浩特 010051；2.赤峰市气象局，内蒙古 赤峰 024000；3.内蒙古气象台，内蒙古 呼和浩特 010051；4.二连浩特市气象局，内蒙古 二连浩特 011100
  • 出版日期:2013-12-31 发布日期:2013-12-31

Abnormal precipitation and its circulation characteristics during June to August from 1961 to 2012 in Inner Mongolia

YOU Li1 CHENG Yu-qin2 LI Hui3 TA La4   

  1. 1.Inner Mongolia Climate Center, Hohhot 010051, China; 2. Chifeng Meteorological Service, Chifeng 024000, China; 3. Inner Mongolia Meteorological Observatory, Hohhot 010051, China; 4. Erlianhot Meteorological Service, Erlianhot 011100, China
  • Online:2013-12-31 Published:2013-12-31

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摘要： 利用内蒙古自治区100个站1961-2012年6-8月各月降水量资料，以降水距平百分率划分了单站和全区各月的多、少雨年份，分析了6-8月全区多雨和少雨站点百分率变化特征。针对异常多雨和少雨年份，探讨了同期北半球欧亚地区大气环流的分布特征。结果表明：8月降水存在减少趋势，6月和7月则主要表现为阶段性多（少）雨，且少雨年多于多雨年。在多雨月份，100hPa高度场上，欧亚中高纬度呈径向环流分布，极涡较弱。其中，6月为两槽一脊型，内蒙古位于高压脊区前部，7、8月为两脊一槽型，内蒙古位于高压脊区后部；500 hPa高度场上，6月，亚洲区主要表现为变形场，内蒙古处于锋生区，或是亚洲中高纬度环流为两脊一槽型，内蒙古处于两高之间的宽广低槽中， 7月、8月欧亚中高纬度环流主要表现为东高西低，内蒙古自治区位于低压槽区中；850hPa流场图上内蒙古为气旋性切变区域或为风场辐合区域控制。在少雨月份，100hPa和500hPa高度场上，欧亚中高纬度呈纬向环流分布，极涡较强，内蒙古位于南亚高压北边的正距平区域；850hPa流场图上表现为弱的风场特征，无明显的水汽输送。

关键词: font-family: 宋体, mso-bidi-font-family: 'Times New Roman', mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, 降水异常')">mso-bidi-language: AR-SA">降水异常, 多雨年, 少雨年, 大气环流

Abstract: Based on the monthly precipitation data in 100 weather stations during June to August from 1961 to 2012 in Inner Mongolia, years with abundant and scarce rainfall at a single station and in the study area were classified according to the precipitation anomaly percentage and their characteristics were analyzed. Aiming at the years with abnormally abundant or scarce rainfall, the distribution characteristics of the atmospheric circulation over the northern hemisphere in the corresponding period were discussed. The results show that rainfall is in a decreasing trend in August, while it is periodically abundant (scarce) in June and July and years with scarce rainfall are great than that with abundant rainfall. For the years with abundant rainfall, the circulation distribution in the middle and upper latitude is radial at 100 hPa height field over the Euope-Asia area, and the polar vortex is weak. The circulation situation is two troughs and one ridge in June and Inner Mongolia is located in the front of high ridge, while it is two ridges and one trough in July and August and Inner Mongolia is located in the back of high ridge. The deformation frontogenesis at 500 hPa in Asia is the main circulation causing the abnormally abundant rainfall in June. Meanwhile, the circulation situation in the middle and upper latitude is two ridges and one trough and Inner Mongolia is located in the wide low trough between two ridges in June, while that is high in the east and low in the west and Inner Mongolia is located in the low trough in July and August. It is controlled by cyclonic shear zone or wind convergence zone over Inner Mongolia at 850 hPa contour chart. On the other hand, for years with scarce rainfall, the circulation distribution in the middle and upper latitude is latitudinal, and the polar vortex is strong at 100 hPa and 500 hPa. Inner Mongolia is located in the positive anomaly area of north high pressure in south Asia. Wind field at 850 hPa chart is weak without obvious water vapor transport.

Key words: font-family: "Times New Roman", mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, Abnormal precipitation')">mso-fareast-font-family: 宋体">Abnormal precipitation, Abundant rainfall year, Scarce rainfall year, Atmospheric circulation