近10 a黄山市区与景区的大气稳定度和混合层厚度的特征

摘要/Abstract

摘要： 利用黄山市区（屯溪）和黄山风景区（黄山）近10 a逐日4个时次的常规气象资料，采用国标GB/T 3840-91中规定的方法，分别计算分析了屯溪和黄山的大气稳定度和混合层厚度的变化特征。结果表明：2005-2013年屯溪和黄山的大气稳定度频率以中性类为主，黄山中性类频率比屯溪高；黄山的大气稳定度频率逐年变化曲线较屯溪平稳。2005-2013年混合层厚度多年均值黄山是屯溪的2.7倍，近些年屯溪和黄山的年均混合层厚度有一定程度的降低。大气稳定度频率和混合层厚度受风速影响较大。

关键词: 屯溪, 黄山, 大气稳定度, 混合层厚度, 风速, 湍流

Abstract: Aim to find out the variation characteristics of atmospheric stability and mixed layer thickness in the slightly polluted area, based on the surface meteorological observation data of Tunxi and Mount Huangshan, Anhui Province, China at 02:00, 08:00, 14:00, and 20:00(Beijing Standard Time) from 2005 to 2014, the atmospheric stability and mixed layer thickness were calculated according to the national standard GB/T 3840-91. According to the modified Pasquill stability classification method, atmosphere stability was divided into 3 levels:instability, neutral and stability, and then mixed layer thickness was calculated according to the formula of different atmosphere stability grade. The results show as follows:(1) the highest occurrence frequency of atmospheric stability from 2005 to 2013 in both Tunxi and Mount Huangshan mainly belonged to the neutral category; meanwhile, the frequency of the neutral category in Mount Huangshan was higher than that in Tunxi. In recent years, there has been an increasing trend in the amplitude of the atmospheric stability frequency curve. The frequency of the neutral category in summer and winter was higher than that in spring and autumn, and the curve of the instability category represented opposite tendency. The variation characteristics in Tunxi were the same as those in Mount Huangshan, except for some differences in summer. Daily variation characteristics in Tunxi and Mount Huangshan exhibit that atmospheric stratification was mostly neutral in the morning, while the instability stratification increased at noon and the stability stratification increased at night.(2) The mean value of mixed layer thickness from 2005 to 2013 in Mount Huangshan was 2.7 times more than that in Tunxi. Annual mean value of mixed layer thickness reduced from 2005 to 2013, warning us that the trend of the atmospheric vertical dilution ability was weakened. There was a good correlation between the monthly mean value of mixed layer thickness and the monthly mean value of wind velocity. The daily mean value of mixed layer thickness in Tunxi reached the highest in the afternoon, and the daily variation curve of mixed layer thickness in Mount Huangshan was relatively stable.

Key words: Tunxi, Mount Huangshan, atmospheric stability, mixed layer thickness, wind speed, turbulence

中图分类号:

P466

张卉, 吴蓉. 近10 a黄山市区与景区的大气稳定度和混合层厚度的特征[J]. 干旱区地理, 2016, 39(6): 1197-1203.

ZHANG Hui, WU Rong. Characteristics of atmospheric stability and mixed layer thickness in Tunxi and Mount Huangshan in recent 10 years[J]. , 2016, 39(6): 1197-1203.

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