Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements

doi:10.1021/acs.estlett.3c00467

	Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements
	Xu, Tianyi 4; Zhang, Chengxin 2; Xue, Jingkai 4; Hu, Qihou 3; Xing, Chengzhi 3; Liu, Cheng 1,2,3
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
	2023-09-25
关键词	satellite remote sensing atmospheric emissions nitrogen oxides emission estimates air pollution
ISSN号	2328-8930
DOI	10.1021/acs.estlett.3c00467
通讯作者	Zhang, Chengxin(zcx2011@ustc.edu.cn) ; Liu, Cheng(chliu81@ustc.edu.cn)
英文摘要	Bottom-up emission inventories of atmospheric nitrogen oxides (NOx = NO + NO2) are usually limited to annual updates and have large uncertainties. The recent launch of the Geostationary Environmental Monitoring Spectrometer (GEMS) first provides hourly measurements of trace gas pollutants from space, enabling new insights into the diurnal variations in anthropogenic NOx emissions. In this study, we present an improved top-down estimation of NOx emission using GEMS NO2 observations and characterize the hourly NOx emissions over cities in East Asia. We use the Gaussian model and polynomial fitting to calculate the hourly NO2 lifetimes for several "point-source" cities and then derive NOx emissions using the flux divergence method. GEMS observations show significant hourly variations in the NOx emissions. Systematic biases in NOx emission estimates are found between the GEMS-based hourly estimations and previous polar-orbiting satellites with a single daily overpass. Compared to using empirically diurnal emission factors, chemical model simulations using GEMS-based NOx emissions substantially reduce the biases with satellite and surface NO2 measurements (e.g., for Wuhan, the biases decreased by 31%). This study highlights the essential role of geostationary satellite observations in characterizing the emission and chemistry of atmospheric pollutants and informing emission control policies.
资助项目	National Natural Science Foundation of China[42225504] ; National Natural Science Foundation of China[42375120] ; National Natural Science Foundation of China[62305322] ; National Key Research and Development Program of China[2022YFC3700100]
WOS关键词	CHANGING NOX LIFETIME ; DIURNAL-VARIATION ; AIR-POLLUTION ; TROPOMI NO2 ; LOTOS-EUROS ; BOTTOM-UP ; URBAN ; DIOXIDE ; CHINA ; SIMULATIONS
WOS研究方向	Engineering ; Environmental Sciences & Ecology
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:001071968200001
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/133517]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhang, Chengxin; Liu, Cheng
作者单位	1.Univ Sci & Technol China, Anhui Higher Educ Inst, Key Lab Precis Sci Instrumentat, Hefei 230026, Peoples R China 2.Univ Sci & Technol China, Dept Precis Machinery & Precis Instrumentat, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China 4.Univ Sci & Technol China, Sch Environm Sci & Optoelect Technol, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Xu, Tianyi,Zhang, Chengxin,Xue, Jingkai,et al. Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS,2023.
APA	Xu, Tianyi,Zhang, Chengxin,Xue, Jingkai,Hu, Qihou,Xing, Chengzhi,&Liu, Cheng.(2023).Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements.ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS.
MLA	Xu, Tianyi,et al."Estimating Hourly Nitrogen Oxide Emissions over East Asia from Geostationary Satellite Measurements".ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS (2023).