基于MAX-DOAS的乌鲁木齐市NO_2时空变化  

Spatiotemporal of NO_2 in Urumqi based on MAX-DOAS

作　　者：刘岩[1,2] 李艳红[1,2] 侯小刚 马雯[1,2] 

机构地区：[1]新疆师范大学地理科学与旅游学院,乌鲁木齐830054 [2]新疆维吾尔自治区重点实验室新疆干旱区湖泊环境与资源实验室,乌鲁木齐830054 [3]新疆维吾尔自治区气候中心,乌鲁木齐830002

出　　处：《环境工程学报》2017年第7期4236-4244,共9页Chinese Journal of Environmental Engineering

基　　金：乌鲁木齐市科技计划项目(P161310004);国家自然科学基金地区基金资助项目(41161010)

摘　　要：为研究乌鲁木齐市NO_2污染状况,了解其时空分布特征及其影响因素,基于多轴差分吸收光谱技术(MAXDOAS),利用2014年4月—2015年12月3个监测点和多次车载移动观测的数据,反演了乌鲁木齐对流层NO_2垂直柱浓度(VCD),并且结合气象和地形等因素进行了分析。结果表明:NO_2VCD由高到低的季节依次是冬季、春季、秋季和夏季,均值为10.84、7.78、5.98和3.56×1015molec·cm^(-2);由高到低的监测站依次是城区站、工业区站和郊区站,年均值为9.52、8.44和5.58×1015molec·cm^(-2);日变化上春冬两季呈U型,夏秋两季呈双峰型;NO_2空间分布由南到北呈明显的"两头低中间高",高值通常出现在市区高架桥附近;乌鲁木齐NO_2VCD与气象因子温度、风速、相对湿度、日照时数都有较好的相关性;乌鲁木齐夏季盛行西北风,顺势于地形利于市区污染物传输出去,冬季盛行东北风,而东面有博格达山阻挡致使风速较低,污染物滞留堆积浓度高。To illuminate the NO2 pollution situation in Urumqi, and to investigate spatiotemporal characteristics of NO2 and also correlation between NO2 and other reasons, based on the Multi axis differential optical absorption spectroscopy （MAS-DOAS） technology, by utilizing the data of the three monitoring sites and the vehicle mounted mobile observation from April 2014 to March 2015, in the study the vertical column densities （VCD） of NO2 in the troposphere of Urumqi was inverted, and also analyzed by combining with the factors of meteorology and topography. The result showed that： the sequence of different seasons with the NO2 VCD from high to low level are respectively the winter, spring, autumn and summer, with the average values in 10.84,7.78,5.98 and 3.56 × 10^15 molec · cm^-2 respectively. For the sequence of observation stations with the observed value from high to low level are respectively the urban area station, industrial area station and farm area station, with the annual av- erage values in 9.52,8.44 and 5.58 × 10^15 molee · cm ^-2 The daily variation showed the U shape in both the winter and spring, and the bimodal shape in both the summer and autumn; its distribution from the south to the north showed obviously the shape of ＂higher on the two ends but lower on the central part＂, the peak value usu- ally appeared at the area near the overpass in urban district; the NO2 VCD in Urumqi has had the quite good cot- relationship with those meteorologic factors such as the temperature, wind speed, relative humidity and sunshine duration. In summer the northwest wind shall prevail in Urumqi, along with the trend of topography, it shall be beneficial for the transmission of urban pollutant, in winter the northeast wind shall prevail in Urumqi, with the obstruction of Mount Bogda at the east side resulting in low wind speed, high concentration of pollutant retention.

关 键 词：多轴差分吸收光谱技术 NO2 季节变化 乌鲁木齐市 

分 类 号：X831[环境科学与工程—环境工程]