气候变化领域集成服务门户(CCPortal): A top-down assessment using OMI NO 2 suggests an underestimate in the NO x emissions inventory in Seoul; South Korea; during KORUS-AQ

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DOI	10.5194/acp-19-1801-2019
	A top-down assessment using OMI NO 2 suggests an underestimate in the NO x emissions inventory in Seoul; South Korea; during KORUS-AQ
	Goldberg D.L.; Saide P.E.; Lamsal L.N.; De Foy B.; Lu Z.; Woo J.-H.; Kim Y.; Kim J.; Gao M.; Carmichael G.; Streets D.G.
发表日期	2019
ISSN	16807316
起始页码	1801
结束页码	1818
卷号	19 期号:3
英文摘要	In this work, we investigate the NO x emissions inventory in Seoul, South Korea, using a regional ozone monitoring instrument (OMI) NO 2 product derived from the standard NASA product. We first develop a regional OMI NO 2 product by recalculating the air mass factors using a high-resolution (4 km × 4 km) WRF-Chem model simulation, which better captures the NO 2 profile shapes in urban regions. We then apply a model-derived spatial averaging kernel to further downscale the retrieval and account for the subpixel variability. These two modifications yield OMI NO 2 values in the regional product that are 1.37 times larger in the Seoul metropolitan region and >2 times larger near substantial point sources. These two modifications also yield an OMI NO 2 product that is in better agreement with the Pandora NO 2 spectrometer measurements acquired during the South Korea-United States Air Quality (KORUS-AQ) field campaign. NO x emissions are then derived for the Seoul metropolitan area during the KORUS-AQ field campaign using a top-down approach with the standard and regional NASA OMI NO 2 products. We first apply the top-down approach to a model simulation to ensure that the method is appropriate: the WRF-Chem simulation utilizing the bottom-up emissions inventory yields a NO x emissions rate of 227±94 kt yr -1 , while the bottom-up inventory itself within a 40 km radius of Seoul yields a NO x emissions rate of 198 kt yr -1 . Using the top-down approach on the regional OMI NO 2 product, we derive the NO x emissions rate from Seoul to be 484±201 kt yr -1 , and a 353±146 kt yr -1 NO x emissions rate using the standard NASA OMI NO 2 product. This suggests an underestimate of 53 % and 36 % in the bottom-up inventory using the regional and standard NASA OMI NO 2 products respectively. To supplement this finding, we compare the NO 2 and NOy simulated by WRF-Chem to observations of the same quantity acquired by aircraft and find a model underestimate. When NO x emissions in the WRF-Chem model are increased by a factor of 2.13 in the Seoul metropolitan area, there is better agreement with KORUS-AQ aircraft observations and the recalculated OMI NO 2 tropospheric columns. Finally, we show that by using a WRF-Chem simulation with an updated emissions inventory to recalculate the air mass factor (AMF), there are small differences (∼8 %) in OMI NO 2 compared to using the original WRF-Chem simulation to derive the AMF. This suggests that changes in model resolution have a larger effect on the AMF calculation than modifications to the South Korean emissions inventory. Although the current work is focused on South Korea using OMI, the methodology developed in this work can be applied to other world regions using TROPOMI and future satellite datasets (e.g., GEMS and TEMPO) to produce high-quality region-specific top-down NO x emissions estimates. © 2019 Author(s).
语种	英语
scopus关键词	assessment method; emission control; emission inventory; nitrogen dioxide; numerical model; spatiotemporal analysis; top-down control; Seoul [South Korea]; South Korea
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/144660
作者单位	Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, United States; Consortium for Advanced Science and Engineering, University of Chicago, Chicago, IL 60637, United States; Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, University of California-Los Angeles, Los Angeles, CA 90095, United States; Goddard Earth Sciences Technology and Research, Universities Space Research Association, Columbia, MD 21046, United States; NASA Goddard Space Flight Center, Code 614, Greenbelt, MD 20771, United States; Department of Earth and Atmospheric Sciences, Saint Louis University, St. Louis, MO 63108, United States; Konkuk University, Seoul, 05029, South Korea; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, United States
推荐引用方式 GB/T 7714	Goldberg D.L.,Saide P.E.,Lamsal L.N.,et al. A top-down assessment using OMI NO 2 suggests an underestimate in the NO x emissions inventory in Seoul; South Korea; during KORUS-AQ[J],2019,19(3).
APA	Goldberg D.L..,Saide P.E..,Lamsal L.N..,De Foy B..,Lu Z..,...&Streets D.G..(2019).A top-down assessment using OMI NO 2 suggests an underestimate in the NO x emissions inventory in Seoul; South Korea; during KORUS-AQ.Atmospheric Chemistry and Physics,19(3).
MLA	Goldberg D.L.,et al."A top-down assessment using OMI NO 2 suggests an underestimate in the NO x emissions inventory in Seoul; South Korea; during KORUS-AQ".Atmospheric Chemistry and Physics 19.3(2019).