收稿日期: 2012-10-29
修回日期: 2012-12-10
网络出版日期: 2012-12-10
An Observation and Analysis of Atmospheric Boundary Layer in Spring at Semi-arid Desert Plain in Inner Mongolia, China
Received date: 2012-10-29
Revised date: 2012-12-10
Online published: 2012-12-10
利用“沙尘气溶胶辐射模型及气候环境生态效应研究”项目加强观测期在二连浩特气象站进行的温、风、湿探空观测资料及架设在朱日和气象站的气象激光雷达资料,采用综合评定法分析了内蒙古半干旱荒漠草原地区大气边界层的厚度、结构特征和变化规律,同时利用气象激光雷达回波资料及气溶胶消光系数在垂直高度上的分布特征,确定了朱日和地区边界层的高度及日变化特征。结果显示,用探空资料综合评定得到的二连浩特地区大气边界层总体厚度偏大,边界层最大厚度达到2 300 m,稳定边界层高度在300 m左右;1 000 m附近为风向的转变高度,其下全为偏东风,其上全为偏西风,边界层风速切变较大;午后到夜间,近地层有东风急流出现,急流最强可达12 m·s-1,急流高度在300 m;在600 m高度附近出现逆湿,低层逆湿现象夜间比白天显著。气象激光雷达资料显示,朱日和地区春季晴日混合层最大厚度可达2 400 m,出现在16:00左右。
牛生杰1 , 吕晶晶1 , 岳 平2 . 半干旱荒漠化草原春季边界层特征的一次综合探测[J]. 中国沙漠, 2013 , 33(6) : 1858 -1865 . DOI: 10.7522/j.issn.1000-694X.2013.00248
The structure characteristics and variations of atmosphere boundary layer in a typical clear day over semi-arid desertification grassland were analyzed by using the sounding data, which involve the wind, air temperature and humidity in Erenhot station on April 24, 2006. At the same time, the boundary layer height and its daily changes over Zhurihe station were analyzed by using the meteorological service lidar echo signal and the aerosol extinction coefficients. The results show that the mean value of the atmosphere boundary layer thickness over semi-arid region in North China is high. The maximum thickness of the atmosphere boundary layer over Erenhot is about 2 300 m, the stable atmosphere boundary layer thickness is about 300 m. The turning height of wind direction is at about 1 000 m. The wind was easterly in lower layers but westerly in upper layers. The low-level east jet appears from afternoon to later at night, its intensity is close to 12 m\5s-1 and its height is about 300 m. The humidity inversion is at about 600 m and it appears mainly in the evening. The meteorological service lidar observation data show that the highest thickness of atmosphere boundary layer over Zhurihe is about 2 400 m and it appears at 16 oclock or so.
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