气候变化领域集成服务门户(CCPortal): Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations

CCPortal

DOI	10.5194/acp-20-7231-2020
	Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations
	Martin R.V.; Martin R.V.; Henze D.K.; Jones D.B.A.
发表日期	2020
ISSN	1680-7316
起始页码	7231
结束页码	7241
卷号	20 期号:12
英文摘要	A critical step in satellite retrievals of trace gas columns is the calculation of the air mass factor (AMF) used to convert observed slant columns to vertical columns. This calculation requires a priori information on the shape of the vertical profile. As a result, comparisons between satelliteretrieved and model-simulated column abundances are influenced by the a priori profile shape. We examine how differences between the shape of the simulated and a priori profiles can impact the interpretation of satellite retrievals by performing an adjoint-based four-dimensional variational (4D-Var) assimilation of synthetic NO2 observations for constraining NOx emissions. We use the GEOS-Chem adjoint model to perform assimilations using a variety of AMFs to examine how a posteriori emission estimates are affected if the AMF is calculated using an a priori shape factor that is inconsistent with the simulated profile. In these tests, an inconsistent a priori shape factor increased root mean square errors in a posteriori emission estimates by up to 30% for realistic conditions over polluted regions. As the difference between the simulated profile shape and the a priori profile shape increases, so do the corresponding assimilated emission errors. This reveals the importance of using simulated profile information for AMF calculations when comparing that simulated output to satellite-retrieved columns. © 2020 Author(s).
语种	英语
scopus关键词	air mass; comparative study; computer simulation; data assimilation; nitrogen dioxide; numerical model; satellite imagery; trace gas
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/141263
作者单位	Department of Energy Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO, United States; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States; Department of Mechanical Engineering, University of Colorado, Boulder, CO, United States; Department of Physics, University of Toronto, Toronto, ON, Canada
推荐引用方式 GB/T 7714	Martin R.V.,Martin R.V.,Henze D.K.,et al. Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations[J],2020,20(12).
APA	Martin R.V.,Martin R.V.,Henze D.K.,&Jones D.B.A..(2020).Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations.Atmospheric Chemistry and Physics,20(12).
MLA	Martin R.V.,et al."Effects of a priori profile shape assumptions on comparisons between satellite NO2 columns and model simulations".Atmospheric Chemistry and Physics 20.12(2020).