基于地基MAX-DOAS和TROPOMI卫星遥感的南京地区大气NO<sub>2</sub>污染特征

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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(NO₂)垂直柱浓度与垂直廓线,分析了对流层NO₂的污染特征,并与最新的TROPOMI NO₂产品进行了对比分析.MAX-DOAS观测结果表明,南京北郊的NO₂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NO₂,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, NO₂浓度相比2019年和2021年同期减少了50%以上,说明观测点的NO₂污染主要由人类活动产生.

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关键词 ：多轴差分吸收光谱仪, TROPOMI, 二氧化氮, 垂直廓线

Abstract：The vertical column concentrations and vertical profiles of nitrogen dioxide (NO₂) 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 NO₂ were analyzed and compared with the latest TROPOMI (Tropospheric Monitoring Instrument) NO₂ products. The results of MAX-DOAS show that NO₂ 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 NO₂ 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 NO₂ 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 NO₂ pollution at the observation sites was mainly resulted from human activities.

Key words： MAX-DOAS TROPOMI NO₂ vertical profiles

收稿日期: 2022-09-06

PACS:	X51
	X87

基金资助:国家自然科学基金项目(42075176)

通讯作者: 银燕,教授,yinyan@nuist.edu.cn E-mail: yinyan@nuist.edu.cn

作者简介: 於清源(1995-),男,江苏镇江人,南京信息工程大学大气物理学院硕士研究生,主要从事大气环境污染物光学监测研究.20201203030@nuist.edu.cn

引用本文:

於清源, 银燕, 张昕. 基于地基MAX-DOAS和TROPOMI卫星遥感的南京地区大气NO₂污染特征[J]. 中国环境科学, 2023, 43(6): 2722-2733. YU Qing-yuan, YIN Yan, ZHANG Xin. Characterizing atmospheric NO₂ pollution in Nanjing with ground-based MAX-DOAS and TROPOMI satellite observations. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2722-2733.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I6/2722

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