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

Larisa Sogacheva, Thomas Popp, Andrew M. Sayer Orcid Logo, Oleg Dubovik, Michael J. Garay, Andreas Heckel, N. Christina Hsu, Hiren Jethva, Ralph A. Kahn Orcid Logo, Pekka Kolmonen, Miriam Kosmale, Gerrit de Leeuw Orcid Logo, Robert C. Levy Orcid Logo, Pavel Litvinov, Alexei Lyapustin Orcid Logo, Peter North Orcid Logo, Omar Torres, Antti Arola Orcid Logo

Atmospheric Chemistry and Physics, Volume: 20, Issue: 4, Pages: 2031 - 2056

Swansea University Authors: Andreas Heckel, Peter North Orcid Logo

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Abstract

Satellite 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 consider...

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Published in: Atmospheric Chemistry and Physics
ISSN: 1680-7324
Published: Copernicus GmbH 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa51019
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spelling 2024-10-11T11:00:17.5426735 v2 51019 2019-07-05 Merging regional and global aerosol optical depth records from major available satellite products 5acac7dc109c4dcbea64540467df6dca Andreas Heckel Andreas Heckel true false fc45a0cb36c24d6cf35313a8c808652f 0000-0001-9933-6935 Peter North Peter North true false 2019-07-05 BGPS Satellite 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. Journal Article Atmospheric Chemistry and Physics 20 4 2031 2056 Copernicus GmbH 1680-7324 24 2 2020 2020-02-24 10.5194/acp-20-2031-2020 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University The 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 H2020EO-2017 project. 2024-10-11T11:00:17.5426735 2019-07-05T11:23:30.0813775 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Larisa Sogacheva 1 Thomas Popp 2 Andrew M. Sayer 0000-0001-9149-1789 3 Oleg Dubovik 4 Michael J. Garay 5 Andreas Heckel 6 N. Christina Hsu 7 Hiren Jethva 8 Ralph A. Kahn 0000-0002-5234-6359 9 Pekka Kolmonen 10 Miriam Kosmale 11 Gerrit de Leeuw 0000-0002-1649-6333 12 Robert C. Levy 0000-0002-8933-5303 13 Pavel Litvinov 14 Alexei Lyapustin 0000-0003-1105-5739 15 Peter North 0000-0001-9933-6935 16 Omar Torres 17 Antti Arola 0000-0002-9220-0194 18 51019__16820__4bf4d1afc2c64411b21d49f1c12140e6.pdf 51019.pdf 2020-03-10T12:39:34.0095115 Output 19372172 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 License (CC-BY). true eng https://creativecommons.org/licenses/by/4.0/
title Merging regional and global aerosol optical depth records from major available satellite products
spellingShingle Merging regional and global aerosol optical depth records from major available satellite products
Andreas Heckel
Peter North
title_short Merging regional and global aerosol optical depth records from major available satellite products
title_full Merging regional and global aerosol optical depth records from major available satellite products
title_fullStr Merging regional and global aerosol optical depth records from major available satellite products
title_full_unstemmed Merging regional and global aerosol optical depth records from major available satellite products
title_sort Merging regional and global aerosol optical depth records from major available satellite products
author_id_str_mv 5acac7dc109c4dcbea64540467df6dca
fc45a0cb36c24d6cf35313a8c808652f
author_id_fullname_str_mv 5acac7dc109c4dcbea64540467df6dca_***_Andreas Heckel
fc45a0cb36c24d6cf35313a8c808652f_***_Peter North
author Andreas Heckel
Peter North
author2 Larisa Sogacheva
Thomas Popp
Andrew M. Sayer
Oleg Dubovik
Michael J. Garay
Andreas Heckel
N. Christina Hsu
Hiren Jethva
Ralph A. Kahn
Pekka Kolmonen
Miriam Kosmale
Gerrit de Leeuw
Robert C. Levy
Pavel Litvinov
Alexei Lyapustin
Peter North
Omar Torres
Antti Arola
format Journal article
container_title Atmospheric Chemistry and Physics
container_volume 20
container_issue 4
container_start_page 2031
publishDate 2020
institution Swansea University
issn 1680-7324
doi_str_mv 10.5194/acp-20-2031-2020
publisher Copernicus GmbH
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description Satellite 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.
published_date 2020-02-24T04:48:50Z
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