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| 2009年初内蒙古降水分布特征与成因 | |
| 引用本文： | 姜学恭,李彰俊,王春燕,胡英华,吴向东.2009年初内蒙古降水分布特征与成因[J].气象科技,2011,39(1):56-60. |
| 作者姓名： | 姜学恭 李彰俊 王春燕 胡英华 吴向东 |
| 作者单位： | 1. 内蒙古自治区气象台,呼和浩特,010051 2. 内蒙古气象信息中心,呼和浩特,010051 3. 内蒙古生态与农业气象中心,呼和浩特,010051 |
| 基金项目： | 国家自然科学基金项目(40965005)资助 |
| 摘 要： | 利用观测资料及NCEP再分析资料对2009年1—2月内蒙古地区降水异常的成因进行了初步分析。结果表明：2009年1—2月内蒙古西部、中部、东部偏南地区降水明显偏少,内蒙古东部偏北地区降水出现一定程度的增加。500 hPa高度距平特征表现为：以45°N为界,其南北两侧分别为正负距平区。这一环流特征是导致内蒙古东部偏北地区降水增多的原因之一,但对内蒙古中西部及东部偏南地区的降水异常并没有决定性的影响。内蒙古中部地区湿度条件和动力抬升条件均不利于降水,因而形成异常干旱;内蒙古东部偏南地区动力抬升条件有利于降水,但湿度条件不利于降水,实况降水的减少表明湿度条件是影响该地区降水的关键因素;内蒙古东北部地区湿度条件接近常年,而动力抬升条件明显有利于降水,因而导致降水增多。 |
| 关 键 词： | 内蒙古 降水异常 成因 大气环流 |
| 收稿时间： | 2009/9/20 0:00:00 |
| 修稿时间： | 2009/11/25 0:00:00 |
Causes of Precipitation Difference over Inner Mongolia in Early 2009 |
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| Jiang Xuegong,Li Zhangjun,Wang Chunyan,Hu Yinghua and Wu Xiangdong.Causes of Precipitation Difference over Inner Mongolia in Early 2009[J].Meteorological Science and Technology,2011,39(1):56-60. | |
| Authors: | Jiang Xuegong Li Zhangjun Wang Chunyan Hu Yinghua and Wu Xiangdong |
| Institution: | Jiang Xuegong1 Li Zhangjun1 Wang Chunyan2 Hu Yinghua Wu Xiangdong3(1 Inner Mongolia Meteorological Office,2 Inner Mongolia Meteorological Information Center,3 Inner Mongolia Ecological and Agricultural Meteorology Centre,Huhhot 010051) |
| Abstract: | A preliminary study is conducted on the causes of the precipitation anomaly event occurred between January and February of 2009 by using the observational and NCEP reanalysis data.The results show that during this period the height anomalies of 500 hPa at south of 45°N were positive while negative at north of 45°N,which induced more precipitation in the north-east part of Inner Mongolia and less precipitation on other parts;in the central part of Inner Mongolia,both humidity and ascending motion were not favorable for precipitation,and therefore there occurred a severe drought;in the south to east part,ascending motion was favorable for precipitation,but the humidity was not,resulting in drought owing to the dominant humidity;for the north to east part,humidity anomaly was not significant,but ascending motion was favorable for precipitation,resulting in more precipitation. |
| Keywords: | Inner Mongolia precipitation anomaly cause circulation pattern |
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