华北平原固城站NO_2对流层柱浓度变化特征  

Characteristics of NO_2 Tropospheric Column Density over a Rural Area in the North China Plain

作　　者：靳军莉[1,2,3] 马建中[1] 林伟立[3] 赵花荣[1] 

机构地区：[1]中国气象科学研究院,北京100081 [2]中国科学院大学,北京100049 [3]中国气象局气象探测中心,北京100081

出　　处：《应用气象学报》2016年第3期303-311,共9页Journal of Applied Meteorological Science

基　　金：国家自然科学基金项目(41330422;41275140;41175114;41075095)

摘　　要：基于2008年9月2010年9月河北固城生态与农业气象试验站多轴差分吸收光谱仪(multi-axis differential optical absorption spectroscopy,MAX-DOAS)获得的太阳散射光谱观测,反演计算该地区NO_2对流层柱浓度,分析其季节、日变化特征以及不同来源输送的影响,并与同期NO_2地面观测资料和卫星产品进行对比分析。发现固城站NO_2对流层柱浓度冬高(5.14×10^(16)cm^(-2))夏低(1.28×10^(16)cm^(-2));日变化形态在四季均呈现中午低、傍晚高的特征,且冬季最明显。与北京城市区域同期的观测相比,冬季固城站观测值略低,而在春、夏季则偏低较显著。地面风玫瑰图分析显示,来自SW,SSW,NE方向及ENE方向的污染输送对其贡献最大。与地面、卫星NO_2观测的对比表明,MAX-DOAS反演的NO_2柱浓度与地面观测浓度具有一致的季节和日变化特征,卫星反演的NO_2对流层柱浓度产品在华北平原农村地区存在系统性低估。NO2 tropospheric vertical column densities （VCD） at Oucheng Eco-meteorological Observation Exper- iment Station （GCH） in Hebei Province from September 2008 to September 2010 are retrieved from the scattered sunlight spectra, measured by a multi-axis differential optical absorption spectroscopy （MAX- DOAS）, and its characteristics are analyzed then. It shows that the mean seasonal NO2 tropospheric VCDs are high in winter （5.14 X 1016 cm-2） and low in summer （1.28）〈 1016 cm-2）. The mean value in winter is a little lower than that in urban Beijing and much lower than that in spring and summer. Averaged diurnal variations are always low at noon and high towards evening for the whole year. The varying amplitude in winter is the biggest among all seasons and the concentration shows a rising up trend in the late afternoon. Less variation can be seen during the day in spring and autumn, and they decrease slowly in summer, reaching a minimum value after noon. The phe- nomena can be explained by seasonal differences of sources and sinks of tropospheric NO2. The tropospheric NO2 over GCH site is mainly affected by the transport from sectors of SW, SSW, NE and ENE, where the major NO2 emission sources in North China are located. It＇s interesting to note that the NO2 tropospheric VCDs over GCH site is higher than that over Xianghe site （another rural site in North China） in winter. Backward trajectories analyses show that in winter two sites have a distinct differ- ence of pollutant sources, which are causes of their discrepancy. Patterns of seasonal variations are quite the same for NO2 tropospheric VCDs retrieved from MAX- DOAS and satellite observation product OMNO2d, as well as the mixing ratios of in situ NO2 measure- ments. Compared with results from MAX-DOAS, a systematic underestimation of OMI satellite observa- tion for NO2 is found in the rural North China area, as those found in urban Beijing and Shanghai megaci- ties. The individual NO2 VCDs retrieved from MAX-DOAS and the surface

关 键 词：多轴差分吸收光谱仪 NO2对流层柱浓度 变化特征 比对验证 

分 类 号：X511[环境科学与工程—环境工程] X16