CAJ | 학술논문

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。
근거간절열곡선법구산최대혼합층후도（MMD）적이론,사용호화호특시1956년11월지2009년3월축일적상규기상관측자료,계산병분석료호화호특성구최대혼합층후도적시간변화특정。종월평균치적년변화간,12월최저（993m）,5월빈최고（2874m）。순평균치적년변화추세기본상여월평균치적년변화일치。당호화호특지구일평균풍속불동시,기최대혼합층후도야유일정변화,일평균풍속소우1m/s시,최대혼합층후도평균치불도1500m;일균풍속대우2m/s시,최대혼합층후도평균치균초과2100m。호화호특성구SO2、NO2화PM10삼충오염물월평균공기오염지수（API）적년변화여월평균최대혼합층후도년변화곡선적위상궤호상반,상관계수분별위-0.750、-0.854화-0.514,저체현료최대혼합층후도시영향성시공기오염적중요인소。
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.