新疆大中小城市夏季对流层NO_2垂直柱浓度变化特征

利用地基多轴差分光谱仪(Mini MAX—DOAS),选择新疆乌鲁木齐、库尔勒、博乐市具有代表性的大中小城市,于2014年6—8月对其市区、工业区、农田区的对流层NO_2浓度进行观测。结果表明:(1)大中小城市夏季大气对流层NO_2垂直柱浓度的日变化有波峰和波谷的波动,其峰值在大中小城市中有所差异,表现为乌鲁木齐(7.590×10~(15)molec·cm~(-2))库尔勒(7.559×10~(15)molec·cm~(-2))博乐(3.578×10~(15)molec·cm~(-2));(2)大中小城市夏季大气对流层NO_2垂直柱浓度大小与城市地表条件差异有关,尤其与观测区的车流量有密切关系,表现为市区(4.643×10~(15)molec·cm~(-2))工业区(4.469×10~(15)molec·cm~(-2))农田区(2.425×10~(15)molec·cm~(-2));(3)不同天气条件下大中小城市大气对流层NO_2的垂直柱浓度特征为雨天(3.082×10~(15)molec·cm~(-2))时浓度最小,说明降水对NO_2的浓度具有重要的影响。

Variation Characteristics of Tropospheric NO 2 Vertical Column Densities over Large and Small Cities of Xinjiang in Summer

Selecting the representative large and small towns which were Urumqi ,Korla ,Bole cities in Xinjiang ,the ground‐based mini MAX‐DOAS measurement was carried out to observe the tropospheric NO2 vertical column density at town ,industrial districts and farmland area in different grade cities from Jul to Aug 2014 .It turned out(1) In the diurnal variation of the concen‐tration of tropospheric NO2 vertical column density have peaks and troughs ,the difference between its peak in the large and small towns ,Urumqi(7.590 × 1015 molec · cm -2 )>Korla(7.559 × 1015 molec · cm -2 )>Bole(3.578 × 1015 molec · cm -2 );(2)During summer the tropospheric NO2 vertical column density has relationship with urban surface condition .Especially it has close rela‐tionship with the number of cars in the observational area ,town(4.643 × 1015 molec · cm -2 )>industrial districts (4.469 × 1015 molec · cm-2 )>farmland area(2.425 × 1015 molec · cm -2 );(3)Under different weather conditions the tropospheric NO2 vertical column density :the minimum density appeared on a rainy day (3.082 × 1015 molec · cm-2 ) ,it turned out the precipitation has an important influence on NO2 .