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

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

<p>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...

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Main Authors: L. Sogacheva, T. Popp, A. M. Sayer, O. Dubovik, M. J. Garay, A. Heckel, N. C. Hsu, H. Jethva, R. A. Kahn, P. Kolmonen, M. Kosmale, G. de Leeuw, R. C. Levy, P. Litvinov, A. Lyapustin, P. North, O. Torres, A. Arola
Format: Article
Language:English
Published: Copernicus Publications 2020-02-01
Series:Atmospheric Chemistry and Physics
Online Access:https://www.atmos-chem-phys.net/20/2031/2020/acp-20-2031-2020.pdf
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spelling doaj-24c92b47ea1c40479280d391ec6d3e9d2020-11-25T02:38:44ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242020-02-01202031205610.5194/acp-20-2031-2020Merging regional and global aerosol optical depth records from major available satellite productsL. Sogacheva0T. Popp1A. M. Sayer2A. M. Sayer3O. Dubovik4M. J. Garay5A. Heckel6N. C. Hsu7H. Jethva8H. Jethva9R. A. Kahn10P. Kolmonen11M. Kosmale12G. de Leeuw13R. C. Levy14P. Litvinov15A. Lyapustin16P. North17O. Torres18A. Arola19Finnish Meteorological Institute, Climate Research Programme, Helsinki, Finland German Aerospace Center (DLR), German Remote Sensing Data Center (DFD), Oberpfaffenhofen, GermanyGoddard Earth Sciences Technology And Research (GESTAR), Universities Space Research Association, Columbia, MD, USANASA Goddard Space Flight Center, Greenbelt, MD, USALaboratoire d'Optique Atmosphérique, CNRS–Université Lille, FranceJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USADepartment of Geography, Swansea University, Swansea, UKClimate and Radiation Laboratory, Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAGoddard Earth Sciences Technology And Research (GESTAR), Universities Space Research Association, Columbia, MD, USANASA Goddard Space Flight Center, Greenbelt, MD, USAClimate and Radiation Laboratory, Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAFinnish Meteorological Institute, Climate Research Programme, Helsinki, Finland German Aerospace Center (DLR), German Remote Sensing Data Center (DFD), Oberpfaffenhofen, GermanyFinnish Meteorological Institute, Climate Research Programme, Helsinki, Finland Climate and Radiation Laboratory, Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAGeneralized Retrieval of Atmosphere and Surface Properties SAS, Lille, FranceClimate and Radiation Laboratory, Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USADepartment of Geography, Swansea University, Swansea, UKAtmospheric Chemistry and Dynamics Laboratory, Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAFinnish Meteorological Institute, Climate Research Programme, Helsinki, Finland <p>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.</p>https://www.atmos-chem-phys.net/20/2031/2020/acp-20-2031-2020.pdf
collection DOAJ
language English
format Article
sources DOAJ
author L. Sogacheva
T. Popp
A. M. Sayer
A. M. Sayer
O. Dubovik
M. J. Garay
A. Heckel
N. C. Hsu
H. Jethva
H. Jethva
R. A. Kahn
P. Kolmonen
M. Kosmale
G. de Leeuw
R. C. Levy
P. Litvinov
A. Lyapustin
P. North
O. Torres
A. Arola
spellingShingle L. Sogacheva
T. Popp
A. M. Sayer
A. M. Sayer
O. Dubovik
M. J. Garay
A. Heckel
N. C. Hsu
H. Jethva
H. Jethva
R. A. Kahn
P. Kolmonen
M. Kosmale
G. de Leeuw
R. C. Levy
P. Litvinov
A. Lyapustin
P. North
O. Torres
A. Arola
Merging regional and global aerosol optical depth records from major available satellite products
Atmospheric Chemistry and Physics
author_facet L. Sogacheva
T. Popp
A. M. Sayer
A. M. Sayer
O. Dubovik
M. J. Garay
A. Heckel
N. C. Hsu
H. Jethva
H. Jethva
R. A. Kahn
P. Kolmonen
M. Kosmale
G. de Leeuw
R. C. Levy
P. Litvinov
A. Lyapustin
P. North
O. Torres
A. Arola
author_sort L. Sogacheva
title Merging regional and global aerosol optical depth records from major available satellite products
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
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2020-02-01
description <p>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.</p>
url https://www.atmos-chem-phys.net/20/2031/2020/acp-20-2031-2020.pdf
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