气候变化领域集成服务门户(CCPortal): AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements

CCPortal

DOI	10.5194/acp-21-6895-2021
	AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements
	Schutgens N.; Dubovik O.; Hasekamp O.; Torres O.; Jethva H.; Leonard P.J.T.; Litvinov P.; Redemann J.; Shinozuka Y.; De Leeuw G.; Kinne S.; Popp T.; Schulz M.; Stier P.
发表日期	2021
ISSN	1680-7316
起始页码	6895
结束页码	6917
卷号	21 期号:9
英文摘要	Global measurements of absorbing aerosol optical depth (AAOD) are scarce and mostly provided by the ground network AERONET (AErosol RObotic NETwork). In recent years, several satellite products of AAOD have been developed. This study's primary aim is to establish the usefulness of these datasets for AEROCOM (Aerosol Comparisons between Observations and Models) model evaluation with a focus on the years 2006, 2008 and 2010. The satellite products are super-observations consisting of 1° ×1° ×30 min aggregated retrievals. This study consists of two papers, the current one that deals with the assessment of satellite observations and a second paper (Schutgens et al., 2021) that deals with the evaluation of models using those satellite data. In particular, the current paper details an evaluation with AERONET observations from the sparse AERONET network as well as a global intercomparison of satellite datasets, with a focus on how minimum AOD (aerosol optical depth) thresholds and temporal averaging may improve agreement between satellite observations. All satellite datasets are shown to have reasonable skill for AAOD (three out of four datasets show correlations with AERONET in excess of 0.6) but less skill for SSA (single-scattering albedo; only one out of four datasets shows correlations with AERONET in excess of 0.6). In comparison, satellite AOD shows correlations from 0.72 to 0.88 against the same AERONET dataset. However, we show that performance vs. AERONET and inter-satellite agreements for SSA improve significantly at higher AOD. Temporal averaging also improves agreements between satellite datasets. Nevertheless multi-annual averages still show systematic differences, even at high AOD. In particular, we show that two POLDER (Polarization and Directionality of the Earth's Reflectances) products appear to have a systematic SSA difference over land of ∼ 1/40.04;, independent of AOD. Identifying the cause of this bias offers the possibility of substantially improving current datasets. We also provide evidence that suggests that evaluation with AERONET observations leads to an underestimate of true biases in satellite SSA. In the second part of this study we show that, notwithstanding these biases in satellite AAOD and SSA, the datasets allow meaningful evaluation of AEROCOM models. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol composition; aerosol formation; correlation; data set; optical depth; satellite data; satellite imagery
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/246916
作者单位	Department of Earth Science, Vrije Universiteit Amsterdam, Amsterdam, 1081 HV, Netherlands; Laboratoire d'Optique Atmosphérique, CNRS/Université de Lille, Villeneuve-d'Ascq, France; Netherlands Institute for Space Research (SRON), Utrecht, Netherlands; Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Universities Space Research Association - GESTAR, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; ADNET Systems, Inc., Suite A100, 7515 Mission Drive, Lanham, MD 20706, United States; School of Meteorology, University of Oklahoma, Norman, United States; Universities Space Research Association, Columbia, MD, United States; NASA Ames Research Center, Moffett Field, CA, United States; Finnish Meteorological Institute (FMI), Climate Research Programme, Helsinki, Finland; Max-Planck-Institut für Meteorologie, Hamburg, 20146, Germany; German Aerospace Center (DLR), German Remote Sensing Data Center Atmosphere, Oberpfaffenho...
推荐引用方式 GB/T 7714	Schutgens N.,Dubovik O.,Hasekamp O.,et al. AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements[J],2021,21(9).
APA	Schutgens N..,Dubovik O..,Hasekamp O..,Torres O..,Jethva H..,...&Stier P..(2021).AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(9).
MLA	Schutgens N.,et al."AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.9(2021).