气候变化领域集成服务门户(CCPortal): Assimilating aerosol optical properties related to size and absorption from POLDER/PARASOL with an ensemble data assimilation system

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DOI	10.5194/acp-21-2637-2021
	Assimilating aerosol optical properties related to size and absorption from POLDER/PARASOL with an ensemble data assimilation system
	Tsikerdekis A.; Schutgens N.A.J.; Hasekamp O.P.
发表日期	2021
ISSN	1680-7316
起始页码	2637
结束页码	2674
卷号	21 期号:4
英文摘要	A data assimilation system for aerosol, based on an ensemble Kalman filter, has been developed for the ECHAM-Hamburg Aerosol Model (ECHAM-HAM) global aerosol model and applied to POLarization and Directionality of the Earth's Reflectances (POLDER)-derived observations of optical properties. The advantages of this assimilation system is that the ECHAM-HAM aerosol modal scheme carries both aerosol particle numbers and mass which are both used in the data assimilation system as state vectors, while POLDER retrievals in addition to aerosol optical depth (AOD) and the Ångström exponent (AE) also provide information related to aerosol absorption like aerosol absorption optical depth (AAOD) and single scattering albedo (SSA). The developed scheme can simultaneously assimilate combinations of multiple variables (e.g., AOD, AE, SSA) to optimally estimate mass mixing ratio and number mixing ratio of different aerosol species. We investigate the added value of assimilating AE, AAOD and SSA, in addition to the commonly used AOD, by conducting multiple experiments where different combinations of retrieved properties are assimilated. Results are evaluated with (independent) POLDER, Moderate Resolution Imaging Spectroradiometer (MODIS) Dark Target, MODIS Deep Blue and Aerosol Robotic Network (AERONET) observations. The experiment where POLDER AOD, AE and SSA are assimilated shows systematic improvement in mean error, mean absolute error and correlation for AOD, AE, AAOD and SSA compared to the experiment where only AOD is assimilated. The same experiment reduces the global ME against AERONET from 0.072 to 0.001 for AOD, from 0.273 to 0.009 for AE and from-0.012 to 0.002 for AAOD. Additionally, sensitivity experiments reveal the benefits of assimilating AE over AOD at a second wavelength or SSA over AAOD, possibly due to a simpler observation covariance matrix in the present data assimilation framework. We conclude that the currently available AE and SSA do positively impact data assimilation. © 2021 Author(s).
语种	英语
scopus关键词	absorption; aerosol property; data assimilation; mixing ratio; optical depth; PARASOL; particle size; POLDER
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/247124
作者单位	Sron Netherlands Institute for Space Research, Utrecht, Netherlands; Department of Earth Science, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
推荐引用方式 GB/T 7714	Tsikerdekis A.,Schutgens N.A.J.,Hasekamp O.P.. Assimilating aerosol optical properties related to size and absorption from POLDER/PARASOL with an ensemble data assimilation system[J],2021,21(4).
APA	Tsikerdekis A.,Schutgens N.A.J.,&Hasekamp O.P..(2021).Assimilating aerosol optical properties related to size and absorption from POLDER/PARASOL with an ensemble data assimilation system.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Tsikerdekis A.,et al."Assimilating aerosol optical properties related to size and absorption from POLDER/PARASOL with an ensemble data assimilation system".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).