干旱区生态环境知识资源中心(Arid): Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring

Arid

DOI	10.5194/essd-12-3573-2020
	Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring
	Chen, Cheng; Dubovik, Oleg; Fuertes, David; Litvinov, Pavel; Lapyonok, Tatyana; Lopatin, Anton; Ducos, Fabrice; Derimian, Yevgeny; Herman, Maurice; Tanre, Didier; Remer, Lorraine A.; Lyapustin, Alexei; Sayer, Andrew M.; Levy, Robert C.; Hsu, N. Christina; Descloitres, Jacques; Li, Lei; Torres, Benjamin; Karol, Yana; Herrera, Milagros; Herreras, Marcos; Aspetsberger, Michael; Wanzenboeck, Moritz; Bindreiter, Lukas; Marth, Daniel; Hangler, Andreas; Federspiel, Christian
通讯作者	Dubovik, O (corresponding author), Univ Lille, CNRS, UMR 8518 LOA Lab Opt Atmospher, F-59000 Lille, France.
来源期刊	EARTH SYSTEM SCIENCE DATA
ISSN	1866-3508
EISSN	1866-3516
出版年	2020
卷号	12 期号:4 页码:3573-3620
英文摘要	Proven by multiple theoretical and practical studies, multi-angular spectral polarimetry is ideal for comprehensive retrieval of properties of aerosols. Furthermore, a large number of advanced space polarimeters have been launched recently or planned to be deployed in the coming few years (Dubovik et al., 2019). Nevertheless, at present, practical utilization of aerosol products from polarimetry is rather limited, due to the relatively small number of polarimetric compared to photometric observations, as well as challenges in making full use of the extensive information content available in these complex observations. Indeed, while in recent years several new algorithms have been developed to provide enhanced aerosol retrievals from satellite polarimetry, the practical value of available aerosol products from polarimeters yet remains to be proven. In this regard, this paper presents the analysis of aerosol products obtained by the Generalized Retrieval of Atmosphere and Surface Properties (GRASP) algorithm from POLDER/PARASOL observations. After about a decade of development, GRASP has been adapted for operational processing of polarimetric satellite observations and several aerosol products from POLDER/PARASOL observations have been released. These updated PARASOL/GRASP products are publicly available (e.g., http://www.icare.univ-lille.fr, last access: 16 October 2018, http://www.grasp-open.com/products/, last access: 28 March 2020); the dataset used in the current study is registered under https://doi.org/10.5281/zenodo.3887265 (Chen et al., 2020). The objective of this study is to comprehensively evaluate the GRASP aerosol products obtained from POLDER/PARASOL observations. First, the validation of the entire 2005-2013 archive was conducted by comparing to ground-based Aerosol Robotic Network (AERONET) data. The subjects of the validation are spectral aerosol optical depth (AOD), aerosol absorption optical depth (AAOD) and single-scattering albedo (SSA) at six wavelengths, as well as Angstrom exponent (AE), fine-mode AOD (AODF) and coarse-mode AOD (AODC) interpolated to the reference wavelength 550 nm. Second, an inter-comparison of PARASOL/GRASP products with the PARASOL/Operational, MODIS Dark Target (DT), Deep Blue (DB) and Multi-Angle Implementation of Atmospheric Correction (MAIAC) aerosol products for the year 2008 was performed. Over land both satellite data validations and inter-comparisons were conducted separately for different surface types, discriminated by bins of normalized difference vegetation index (NDVI): < 0.2, 0.2 <= and < 0.4, 0.4 <= and < 0.6, and >= 0.6. Three PARASOL/GRASP products were analyzed: GRASP/HP (High Precision), Optimized and Models. These different products are consistent but were obtained using different assumptions in aerosol modeling with different accuracies of atmospheric radiative transfer (RT) calculations. Specifically, when using GRASP/HP or Optimized there is direct retrieval of the aerosol size distribution and spectral complex index of refraction. When using GRASP/Models, the aerosol is approximated by a mixture of several prescribed aerosol components, each with their own fixed size distribution and optical properties, and only the concentrations of those components are retrieved. GRASP/HP employs the most accurate RT calculations, while GRASP/Optimized and GRASP/Models are optimized to achieve the best trade-off between accuracy and speed. In all these three options, the underlying surface reflectance is retrieved simultaneously with the aerosol properties, and the radiative transfer calculations are performed online during the retrieval. All validation results obtained for the full archive of PARASOL/GRASP products show solid quality of retrieved aerosol characteristics. The GRASP/Models retrievals, however, provided the most solid AOD products, e.g., AOD (550 nm) is unbiased and has the highest correlation (R similar to 0.92) and the highest fraction of retrievals (similar to 55.3 %) satisfying the accuracy requirements of the Global Climate Observing System (GCOS) when compared to AERONET observations. GRASP/HP and GRASP/Optimized AOD products show a non-negligible positive bias (similar to 0.07) when AOD is low (< 0.2). On the other hand, the detailed aerosol microphysical characteristics (AE, AODF, AODC, SSA, etc.) provided by GRASP/HP and GRASP/Optimized correlate generally better with AERONET than do the results of GRASP/Models. Overall, GRASP/HP processing demonstrates the high quality of microphysical characteristics retrieval versus AERONET. Evidently, the GRASP/Models approach is more adapted for retrieval of total AOD, while the detailed aerosol microphysical properties are limited when a mixture of aerosol models with fixed optical properties are used. The results of a comparative analysis of PARASOL/GRASP and MODIS products showed that, based on validation against AERONET, the PARASOL/GRASP AOD (550 nm) product is of similar and sometimes of higher quality compared to the MODIS products. All AOD retrievals are more accurate and in good agreement over ocean. Over land, especially over bright surfaces, the retrieval quality degrades and the differences in total AOD products increase. The detailed aerosol characteristics, such as AE, AODF and AODC from PARASOL/GRASP, are generally more reliable, especially over land. The global inter-comparisons of PARASOL/GRASP versus MODIS showed rather robust agreement, though some patterns and tendencies were observed. Over ocean, PARASOL/Models and MODIS/DT AOD agree well with the correlation coefficient of 0.92. Over land, the correlation between PARASOL/Models and the different MODIS products is lower, ranging from 0.76 to 0.85. There is no significant global offset; though over bright surfaces MODIS products tend to show higher values compared to PARASOL/Models when AOD is low and smaller values for moderate and high AODs. Seasonal AOD means suggest that PARASOL/GRASP products show more biomass burning aerosol loading in central Africa and dust over the Taklamakan Desert, but less AOD in the northern Sahara. It is noticeable also that the correlation for the data over AERONET sites are somewhat higher, suggesting that the retrieval assumptions generally work better over AERONET sites than over the rest of the globe. One of the potential reasons may be that MODIS retrievals, in general, rely more on AERONET climatology than GRASP retrievals. Overall, the analysis shows that the quality of AOD retrieval from multi-angular polarimetric observations like POLDER is at least comparable to that of single-viewing MODIS-like imagers. At the same time, the multi-angular polarimetric observations provide more information on other aerosol properties (e.g., spectral AODF, AODC, AE), as well as additional parameters such as AAOD and SSA.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000603352400001
WOS关键词	OPTICAL DEPTH ; LAND SURFACES ; INVERSION ALGORITHM ; ACEPOL CAMPAIGN ; DESERT DUST ; RETRIEVAL ; SATELLITE ; AERONET ; OCEAN ; MISSION
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348808
作者单位	[Chen, Cheng; Dubovik, Oleg; Lapyonok, Tatyana; Ducos, Fabrice; Derimian, Yevgeny; Herman, Maurice; Tanre, Didier; Li, Lei; Torres, Benjamin; Herrera, Milagros; Herreras, Marcos] Univ Lille, CNRS, UMR 8518 LOA Lab Opt Atmospher, F-59000 Lille, France; [Chen, Cheng; Fuertes, David; Litvinov, Pavel; Lopatin, Anton; Karol, Yana] GRASP SAS, Villeneuve Dascq, France; [Remer, Lorraine A.] Univ Maryland, Joint Ctr Earth Syst Technol, Baltimore, MD 21201 USA; [Lyapustin, Alexei; Sayer, Andrew M.; Levy, Robert C.; Hsu, N. Christina] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA; [Sayer, Andrew M.] Univ Space Res Assoc, Columbia, MD USA; [Descloitres, Jacques] Univ Lille, CNRS, CNES, UMS 2877 AERIS,ICARE Data & Serv Ctr, F-59000 Lille, France; [Li, Lei] Chinese Acad Meteorol Sci, CMA, State Key Lab Severe Weather LASW, Beijing 100081, Peoples R China; [Li, Lei] Chinese Acad Meteorol Sci, CMA, Key Lab Atmospher Chem LAC, Beijing 100081, Peoples R China; [Aspetsberger, Michael; Wanzenboeck, Moritz; Bindreiter, Lu...
推荐引用方式 GB/T 7714	Chen, Cheng,Dubovik, Oleg,Fuertes, David,et al. Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring[J],2020,12(4):3573-3620.
APA	Chen, Cheng.,Dubovik, Oleg.,Fuertes, David.,Litvinov, Pavel.,Lapyonok, Tatyana.,...&Federspiel, Christian.(2020).Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring.EARTH SYSTEM SCIENCE DATA,12(4),3573-3620.
MLA	Chen, Cheng,et al."Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring".EARTH SYSTEM SCIENCE DATA 12.4(2020):3573-3620.