Merging regional and global aerosol optical depth records from major available satellite products

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dc.contributor.authorSogacheva, Larisa
dc.contributor.authorPopp, Thomas
dc.contributor.authorSayer, Andrew
dc.contributor.authorDubovik, Oleg
dc.contributor.authorGaray, Michael J.
dc.contributor.authorHeckel, Andreas
dc.contributor.authorHsu, N. Christina
dc.contributor.authorJethva, Hiren
dc.contributor.authorKahn, Ralph A.
dc.contributor.authorKolmonen, Pekka
dc.contributor.authorKosmale, Miriam
dc.contributor.authorLeeuw, Gerrit de
dc.contributor.authorLevy, Robert C.
dc.contributor.authorLitvinov, Pavel
dc.contributor.authorLyapustin, Alexei
dc.contributor.authorNorth, Peter
dc.contributor.authorTorres, Omar
dc.contributor.authorArola, Antti
dc.date.accessioned2022-10-27T13:06:39Z
dc.date.available2022-10-27T13:06:39Z
dc.date.issued2020-02-24
dc.description.abstractSatellite instruments provide a vantage point for studying aerosol loading consistently over different regions of the world. However, the typical lifetime of a single satellite platform is on the order of 5–15 years; thus, for climate studies, the use of multiple satellite sensors should be considered. Discrepancies exist between aerosol optical depth (AOD) products due to differences in their information content, spatial and temporal sampling, calibration, cloud masking, and algorithmic assumptions. Users of satellite-based AOD time-series are confronted with the challenge of choosing an appropriate dataset for the intended application. In this study, 16 monthly AOD products obtained from different satellite sensors and with different algorithms were inter-compared and evaluated against Aerosol Robotic Network (AERONET) monthly AOD. Global and regional analyses indicate that products tend to agree qualitatively on the annual, seasonal and monthly timescales but may be offset in magnitude. Several approaches were then investigated to merge the AOD records from different satellites and create an optimised AOD dataset. With few exceptions, all merging approaches lead to similar results, indicating the robustness and stability of the merged AOD products. We introduce a gridded monthly AOD merged product for the period 1995–2017. We show that the quality of the merged product is as least as good as that of individual products. Optimal agreement of the AOD merged product with AERONET further demonstrates the advantage of merging multiple products. This merged dataset provides a long-term perspective on AOD changes over different regions of the world, and users are encouraged to use this dataset.en_US
dc.description.sponsorshipThe work presented is partly supported by the Copernicus Climate Change Service (contracts C3S_312a_lot5 and C3S_312b_Lot2) which is funded by the European Union, with support from ESA as part of the Climate Change Initiative (CCI) project Aerosol_cci (ESA-ESRIN projects AO/1-6207/09/I-LG and ESRIN/400010987 4/14/1-NB) and the AirQast 776361 H2020- EO-2017 project.en_US
dc.description.urihttps://acp.copernicus.org/articles/20/2031/2020/en_US
dc.format.extent26 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2iqls-9dlj
dc.identifier.citationSogacheva, L., Popp, T., Sayer, A. M., Dubovik, O., Garay, M. J., Heckel, A., Hsu, N. C., Jethva, H., Kahn, R. A., Kolmonen, P., Kosmale, M., de Leeuw, G., Levy, R. C., Litvinov, P., Lyapustin, A., North, P., Torres, O., and Arola, A.: Merging regional and global aerosol optical depth records from major available satellite products, Atmos. Chem. Phys., 20, 2031–2056, https://doi.org/10.5194/acp-20-2031-2020, 2020.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-20-2031-2020
dc.identifier.urihttp://hdl.handle.net/11603/26240
dc.language.isoen_USen_US
dc.publisherEGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleMerging regional and global aerosol optical depth records from major available satellite productsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9149-1789en_US

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