摘要
利用 1988～ 1992年兰州市气象站逐日 0 8h(北京时 ,下同 )常规气象探空观测资料及同期兰州市环境监测站空气污染物浓度监测资料 ,统计分析了市区低空大气温度层结变化特征及其与3种主要空气污染物 (SO2 ,CO和 NOx)浓度之间的关系 .结果表明 :兰州市区低空大气温度层结全年以弱稳定为主 ,一年四季皆有逆温层存在 ;在冬季 ,逆温层发生频率最高 (95 .8% ) ,贴地逆温层厚度最厚 (平均 74 0 m)、强度最强 (平均 0 .5 3℃ / 10 0 m) ,脱地逆温层底相对高度最低 (平均 935m) ;同时 ,贴地大气层结温度递减率与空气污染物浓度呈显著反相关 .由此表明 ,兰州市区低空大气温度层结状况是影响该市空气污染程度的重要因素之一 .
Using the sounding data of Lanzhou Meteorological Station and those of the concentrations of air pollutants supplied by Lanzhou Environmental Station during 1988～1992 ,we have analyzed the characteristics of the stratification of lower layer atmospheric temperature and their relations with the concentrations of three main air pollutants(SO 2,CO and NO x ). The results are as follows :The character of lower layer temperature structure in Lanzhou is mainly in weak stable condition during a year, and the inversion layer always exists in all seasons. In winter, the frequency of inversion layer is the highest(95.8%), the thickness of ground hugging inversion layer is the highest(740 m), the intensity of ground hugging inversion layer is the strongest(0.53 ℃/100 m),and the height of the bottom of untouched ground inversion layer is the lowest(935 m). At the same time, the correlation coefficient between temperature vertical decrease rate of low layer atmosphere and air pollutant concentration is negative. Thus, it can be seen that the characteristics of stratification of lower layer atmospheric temperature are important to air pollution in Lanzhou proper.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第4期133-139,共7页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金 (49875 0 0 4 )
教育部骨干教师基金资助项目 .
