我国早晨与傍晚的大气边界层厚度研究

Research on the thickness of atmospheric boundary-layer over China in the morning and the evening

首先探讨了常规气象资料计算大气边界层厚度的方法，然后利用全国１２５个无线电探空站的观测资料，计算了我国早晨与傍晚时的大气边界层厚度ｈ，并分析了ｈ的地区分布与季节变化特征。结果表明，华南地区边界层厚度年平均值最大（ｈ＞５００ｍ）；陕甘宁地区最小（ｈ＝３１８ｍ）；多数地区的ｈ值在冬季最小而夏季或春季最大。

This paper discussed firstly the method of calculating atmospheric boundary-layer thickness (h) based on conventional atmosphere data.Then,authors figured out h values over China in the morning and the evening and analyzed the characters of their regional distributions and seasonal variations utilizing observed data from 125 radiosondage stations in China.The results indicated that the annual mean thickness value of over 500m in South China reached the peak value,that of 318m in Shanxi,Gansu,Ningxia region was the lowets,and the h value of most regions in China changed from minimum in winter to maximum in summer or spring.