呼和浩特城区最大混合层厚度变化特征分析  

Changes of the Maximum Mixing Depths in Hohhot City

作　　者：卢士庆 闫宾 谷雨 李晨[3] 兰斌[4] 

机构地区：[1]内蒙古气象科学研究所,呼和浩特010051 [2]内蒙古环境监测中心站,呼和浩特010010 [3]准格尔旗气象局,内蒙古准格尔旗017100 [4]化德县气象局,内蒙古化德县013350

出　　处：《四川环境》2011年第4期67-71,共5页Sichuan Environment

基　　金：内蒙古自治区科技计划项目(20070501)

摘　　要：根据干绝热曲线法求算最大混合层厚度(MMD)的理论,使用呼和浩特市1956年11月至2009年3月逐日的常规气象观测资料,计算并分析了呼和浩特城区最大混合层厚度的时间变化特征。从月平均值的年变化看,12月最低(993m),5月份最高(2874m)。旬平均值的年变化趋势基本上与月平均值的年变化一致。当呼和浩特地区日平均风速不同时,其最大混合层厚度也有一定变化,日平均风速小于1m/s时,最大混合层厚度平均值不到1500m;日均风速大于2m/s时,最大混合层厚度平均值均超过2100m。呼和浩特城区SO2、NO2和PM10三种污染物月平均空气污染指数(API)的年变化与月平均最大混合层厚度年变化曲线的位相几乎相反,相关系数分别为-0.750、-0.854和-0.514,这体现了最大混合层厚度是影响城市空气污染的重要因素。Using daily meteorological data of Hohhot observed from Nov.of 1956 to March of 2009,the changes of maximum mixing depths（MMD） in Hohhot were calculated and analyzed by applying dry adiabatic curve method.According to the annual change of monthly averages,the minimum value（993 m） and maximum value（2874 m） appeared in December and May respectively.The annual changes of ten-day averages were similar as that of monthly averages.The MMD changed with daily average of wend speed.Actually,when the daily average of wend speed was lower than 1 m/s,the average of MMD was less than 1500m.While when the former was higher than 2 m/s,the latter was more than 2100 m.In Hohhot downtown,the monthly averages of air pollution index（API） of SO2,NO2 and PM10 annually changed inversely with the annual averages of MMD,of which the correlation coefficients were-0.750,-0.854 and-0.514,respectively.It meant that the MMD was a primary factor affecting air pollution in Hohhot City.

关 键 词：最大混合层厚度 干绝热曲线法 特征分析 

分 类 号：X703[环境科学与工程—环境工程]