气候变化领域集成服务门户(CCPortal): Tropospheric NO2 vertical profiles over South Korea and their relationto oxidant chemistry: implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space

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DOI	10.5194/acp-23-2465-2023
	Tropospheric NO2 vertical profiles over South Korea and their relationto oxidant chemistry: implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space
	Yang, Laura Hyesung; Jacob, Daniel J.; Colombi, Nadia K.; Zhai, Shixian; Bates, Kelvin H.; Shah, Viral; Beaudry, Ellie; Yantosca, Robert M.; Lin, Haipeng; Brewer, Jared F.; Chong, Heesung; Travis, Katherine R.; Crawford, James H.; Lamsal, Lok N.; Koo, Ja-Ho; Kim, Jhoon
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2465
结束页码	2481
卷号	23 期号:4 页码:17
英文摘要	Nitrogen oxides (NOx equivalent to NO + NO2) are of central importance for air quality, climate forcing, and nitrogen deposition to ecosystems. The Geostationary Environment Monitoring Spectrometer (GEMS) is now providing hourly NO2 satellite observations over East Asia, offering the first direct measurements of NO2 di-urnal variation from space to guide understanding of NOx emissions and chemistry. The NO2 retrieval requires independent vertical profile information from a chemical transport model (CTM) to compute the air mass fac-tor (AMF) that relates the NO2 column measured along the line of sight to the NO2 vertical column. Here, we use aircraft observations from the Korea-United States Air Quality (KORUS-AQ) campaign over the Seoul metropolitan area (SMA) and around the Korean Peninsula in May-June 2016 to better understand the factors controlling the NO2 vertical profile, its diurnal variation, the implications for the AMFs, and the ability of the GEOS-Chem CTM to compute the NO2 vertical profiles used for AMFs. Proper representation of oxidant chem-istry is critical for the CTM simulation of NO2 vertical profiles and is achieved in GEOS-Chem through new model developments, including aerosol nitrate photolysis, reduced uptake of hydroperoxy (HO2) radicals by aerosols, and accounting for atmospheric oxidation of volatile chemical products (VCPs). We find that the tropo-spheric NO2 columns measured from space in the SMA are mainly contributed by the planetary boundary layer (PBL) below 2 km altitude, reflecting the highly polluted conditions. Repeated measurements of NO2 vertical profiles over the SMA at different times of day show that diurnal change in mixing depth affecting the NO2 vertical profile induces a diurnal variation in AMFs of comparable magnitude to the diurnal variation in the NO(2 )column. GEOS-Chem captures this diurnal variation in AMFs and more generally the variability in the AMFs for the KORUS-AQ NO2 vertical profiles (2.7 % mean bias, 7.6 % precision), with some outliers in the morning due to errors in the timing of mixed-layer growth.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000936984000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273664
作者单位	Harvard University; Harvard University; University of California System; University of California Davis; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; Science Systems and Applications Inc; University of Minnesota System; University of Minnesota Twin Cities; Harvard University; Smithsonian Astrophysical Observatory; Smithsonian Institution; National Aeronautics & Space Administration (NASA); NASA Langley Research Center; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; University System of Maryland; University of Maryland Baltimore County; Yonsei University
推荐引用方式 GB/T 7714	Yang, Laura Hyesung,Jacob, Daniel J.,Colombi, Nadia K.,et al. Tropospheric NO2 vertical profiles over South Korea and their relationto oxidant chemistry: implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space[J],2023,23(4):17.
APA	Yang, Laura Hyesung.,Jacob, Daniel J..,Colombi, Nadia K..,Zhai, Shixian.,Bates, Kelvin H..,...&Kim, Jhoon.(2023).Tropospheric NO2 vertical profiles over South Korea and their relationto oxidant chemistry: implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),17.
MLA	Yang, Laura Hyesung,et al."Tropospheric NO2 vertical profiles over South Korea and their relationto oxidant chemistry: implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):17.