纳木错地区秋季影响降水的因子分析

高原气象

纳木错地区秋季影响降水的因子分析

许洁

西北生态环境资源研究院

Analysis of factors that effect precipitation over Nam Co area in fall

Jie Xu

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摘要： 本文首先利用中国区域地面气象要素数据集(CMFD)分析了1992年到2015年纳木错地区月平均降水分布情况，发现湖泊效应导致的下风向降水在10-11月较为明显。其次根据中国科学院纳木错多圈层综合观测研究站自动气象站2 m的风速和气温的数据，分析了2005年到2015年焚风累积发生次数的月分布特征，得出 12月焚风发生几率最大，且10月是秋季中发生焚风现象次数最多的月份的结果。再者，运用WRF模型对纳木错地区10月份的降水情况进行了模拟，发现在已有大气环流背景条件下，纳木错地区秋季降水受到湖泊存在的影响比上游地形影响显著。有、无湖模拟试验表明，纳木错地区湖泊的存在会使周边地区尤其是湖泊下风向降水增多，影响范围可达100 km。上风向较高地形会使整个区域降水小幅增加，上风向地形导致的焚风效应对纳木错地区降水的影响较弱。

Abstract: In this paper, we analyze the distribution of monthly averaged precipitation from year 1992 to 2015 around Nam Co area by using CMFD(China meteorological forcing data) and analyze the frequency of foehn from year 1995 to 2015 by using wind and air temperature data from Nam Co station(Nam Co Station for Multisphere Observation and Research, Chinese Academy of Sciences). The results show that the spatial lake-effect precipitation is most significant in fall, and foehn is the most frequent in December. And in October, the frequency of foehn is the most in fall. Then we simulate precipitation over Nam Co area in October using WRF. We find that under the background of air circulation, lake can affect the precipitation over Nam Co area more significantly than upstream orography. Comparing no lake experiment with control experiment, we can conclude that the exist of Nam Co lake can make surrounding area, especially downstream area, more precipitation and the effect distance can be 100 km. Upstream orography can enhance precipitation but the effect is little, and foehn has little effect on the precipitation in areas downstream of the lake.

收稿日期: 2018-03-09 出版日期: 2018-04-20

基金资助: 中国气象局预报员东南大风专项;国家自然科学基金;气象行业专项（GYHY 201406011）;江苏高校优势学科建设工程资助项目（PAPD）的支持;毫米波雷达关键技术研究;人工增雨随机化外场试验和效果检验技术研究;甘肃省干旱气象科学研究基金项目“石羊河流域干旱灾害风险评估及防御对策研究”

通讯作者: 许洁

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引用本文:

许洁. 纳木错地区秋季影响降水的因子分析[J]. 高原气象, .

Jie Xu. Analysis of factors that effect precipitation over Nam Co area in fall. Plateau Meteorology, .

链接本文:

http://gyqx.westgis.ac.cn/CN/ 或 http://gyqx.westgis.ac.cn/CN/Y0/V/I/0

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