气候变化领域集成服务门户(CCPortal): Retrieval of Tropospheric NO2 Vertical Column Densities from Ground-Based MAX-DOAS Measurements in Lhasa, a City on the Tibetan Plateau

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DOI	10.3390/rs15194689
	Retrieval of Tropospheric NO2 Vertical Column Densities from Ground-Based MAX-DOAS Measurements in Lhasa, a City on the Tibetan Plateau
	Cheng, Siyang; Pu, Guijuan; Ma, Jianzhong; Hong, Hyunkee; Du, Jun; Yudron, Tseten; Wagner, Thomas
发表日期	2023
EISSN	2072-4292
卷号	15 期号:19
英文摘要	In order to investigate the abundance of and temporal variation in nitrogen dioxide (NO2) in the troposphere and validate the corresponding satellite products during a normal year and the lockdown period of coronavirus disease 2019 (COVID-19) in Lhasa, a city on the Tibetan Plateau (TP), ground-based remote-sensing measurements captured by applying multi-axis differential optical absorption spectroscopy (MAX-DOAS) were recorded from August 2021 to March 2023 at the Lhasa site (91.14 degrees E, 29.66 degrees N; 3552.5 m altitude). The NO2 differential slant column densities (dSCDs) were retrieved from the spectra of scattered solar light at different elevation angles. Then, the tropospheric NO2 vertical column densities (VCDs) were calculated with the geometric approximation method. Based on the retrieved tropospheric NO2 VCDs, we found that the pattern of monthly variation in tropospheric NO2 VCDs in Lhasa presented two peaks, one in winter and one around May. According to the monthly means of tropospheric NO2 VCDs during the COVID-19 lockdown, the NO2 background level in Lhasa was estimated to be 0.53 x 10(15) moleculescm(-2). For diurnal variations in tropospheric NO2 VCDs, the morning and evening peaks disappeared during the COVID-19 lockdown period. The east-west direction (i.e., along the river valley) was the main path of NO2 transport and dispersion in Lhasa, but the tropospheric NO2 VCDs were little dependent on the wind direction or wind speed during the COVID-19 lockdown. The correlation coefficient of tropospheric NO2 VCDs was R = 0.33 (R = 0.43), with the averaged relative deviation of -28% (99%) for the TROPOMI (GEMS) relative to ground-based MAX-DOAS. The monthly deviations of tropospheric NO2 VCDs between ground-based MAX-DOAS and the satellite showed a dependence on NO2 abundance, with the maxima of the monthly positive deviations during the COVID-19 lockdown period. The GEMS could not capture the strong and systematic diurnal variation in tropospheric NO2 VCDs in the normal year well. During the COVID-19 lockdown, the GEMS (>2 x 10(15) moleculescm(-2)) overestimated the hourly levels measured by ground-based MAX-DOAS (<1.6 x 10(15) moleculescm(-2)). As a whole, these results are beneficial to understanding the influences of anthropogenic activities on NO2 background levels in Lhasa and to learning the accuracy of satellite products over the TP, with its high altitude and complex terrain.
关键词	tropospheric NO2 ground-based remote sensing MAX-DOAS Tibetan Plateau
英文关键词	PROVINCIAL CAPITAL CITIES; ABSORPTION CROSS-SECTIONS; ATMOSPHERIC COMPOSITION; PARTICULATE POLLUTANTS; AIR-QUALITY; OZONE; HCHO; SO2; VALIDATION; TROPOMI
WOS研究方向	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:001145811500001
来源期刊	REMOTE SENSING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283908
作者单位	China Meteorological Administration; Chinese Academy of Meteorological Sciences (CAMS); China Meteorological Administration; Chinese Academy of Meteorological Sciences (CAMS); Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics & Physics, CAS; National Institute of Environmental Research (NIER), Republic of Korea; Max Planck Society
推荐引用方式 GB/T 7714	Cheng, Siyang,Pu, Guijuan,Ma, Jianzhong,et al. Retrieval of Tropospheric NO2 Vertical Column Densities from Ground-Based MAX-DOAS Measurements in Lhasa, a City on the Tibetan Plateau[J],2023,15(19).
APA	Cheng, Siyang.,Pu, Guijuan.,Ma, Jianzhong.,Hong, Hyunkee.,Du, Jun.,...&Wagner, Thomas.(2023).Retrieval of Tropospheric NO2 Vertical Column Densities from Ground-Based MAX-DOAS Measurements in Lhasa, a City on the Tibetan Plateau.REMOTE SENSING,15(19).
MLA	Cheng, Siyang,et al."Retrieval of Tropospheric NO2 Vertical Column Densities from Ground-Based MAX-DOAS Measurements in Lhasa, a City on the Tibetan Plateau".REMOTE SENSING 15.19(2023).