基于地基MAX-DOAS和TROPOMI卫星遥感的南京地区大气NO_(2)污染特征  

Characterizing atmospheric NO_(2)pollution in Nanjing with ground-based MAX-DOAS and TROPOMI satellite observations

作　　者：於清源 银燕[1,2] 张昕[1,2] YU Qing-yuan;YIN Yan;ZHANG Xin(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing 210044,China;School of Atmospheric Physics,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]中国气象局气溶胶与云降水重点开放实验室,江苏南京210044 [2]南京信息工程大学大气物理学院,江苏南京210044

出　　处：《中国环境科学》2023年第6期2722-2733,共12页China Environmental Science

基　　金：国家自然科学基金项目(42075176)。

摘　　要：基于2018年5月至2020年12月多轴差分吸收光谱仪(MAX-DOAS)于南京北郊的观测资料,反演了二氧化氮(NO_(2))垂直柱浓度与垂直廓线,分析了对流层NO_(2)的污染特征,并与最新的TROPOMI NO_(2)产品进行了对比分析.MAX-DOAS观测结果表明,南京北郊的NO_(2)受温度和太阳辐射影响,呈现出夏季低冬季高、正午低早晚高的变化特征,且主要源于东南方向的污染输送.对比发现,TROPOMI数据与MAX-DOAS在春、秋、冬三季相关系数高于0.7,但在夏季由于多云及低浓度NO_(2),相关系数仅为0.544.此外,TROPOMI观测到了南京城区与长三角地区的主要污染热点,与MAX-DOAS高污染方向一致.同时,MAX-DOAS与TROPOMI均观测到了2020年春节后16~30d由于COVID-19封控,NO_(2)浓度相比2019年和2021年同期减少了50%以上,说明观测点的NO_(2)污染主要由人类活动产生.The vertical column concentrations and vertical profiles of nitrogen dioxide(NO_(2))were retrieved based on observations from a multi-axis differential absorption spectrometer(MAX-DOAS)in the northern suburb of Nanjing from May 2018 to December 2020.The spatial and temporal characteristics of tropospheric NO_(2)were analyzed and compared with the latest TROPOMI(Tropospheric Monitoring Instrument)NO_(2)products.The results of MAX-DOAS show that NO_(2)concentration in the northern suburb of Nanjing was influenced by air temperature and solar radiation with low values in summer and high values in winter as well as low values in midday and high values in the morning and evening.And the pollutant mainly came from the southeast direction.The correlation coefficient between TROPOMI data and MAX-DOAS observations was larger than 0.7 in spring,autumn and winter,but only 0.54 in summer,due to the influences of cloudiness and low NO_(2)concentration in this season.In addition,TROPOMI captured major pollution hotspots in Nanjing urban area and the Yangtze River Delta,which was consistent with the high pollution sector indicated by the MAX-DOAS observations.Meanwhile,both the MAX-DOAS and TROPOMI recorded a more than 50%reduction in NO_(2)concentration during 16~30 days after the Chinese New Year in 2020 due to the COVID-19 close-down as compared with that in 2019 and 2021,indicating that NO_(2)pollution at the observation sites was mainly resulted from human activities.

关 键 词：多轴差分吸收光谱仪 TROPOMI 二氧化氮 垂直廓线 

分 类 号：X51[环境科学与工程—环境工程] X87