AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements
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 dataset...
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ftpubman:oai:pure.mpg.de:item_3321030 2023-08-27T04:03:33+02:00 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. Litvinov, P. Redemann, J. Shinozuka, Y. De Leeuw, G. Kinne, S. Popp, T. Schulz, M. Stier, P. 2021-05 application/pdf http://hdl.handle.net/21.11116/0000-0008-9918-1 http://hdl.handle.net/21.11116/0000-0008-991A-F http://hdl.handle.net/21.11116/0000-0008-991B-E eng eng info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-21-6895-2021 http://hdl.handle.net/21.11116/0000-0008-9918-1 http://hdl.handle.net/21.11116/0000-0008-991A-F http://hdl.handle.net/21.11116/0000-0008-991B-E info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Atmospheric Chemistry and Physics info:eu-repo/semantics/article 2021 ftpubman https://doi.org/10.5194/acp-21-6895-2021 2023-08-02T01:58:17Z 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 ... Article in Journal/Newspaper Aerosol Robotic Network Max Planck Society: MPG.PuRe Atmospheric Chemistry and Physics 21 9 6895 6917 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Schutgens, N. Dubovik, O. Hasekamp, O. Torres, O. Jethva, H. Leonard, P. Litvinov, P. Redemann, J. Shinozuka, Y. De Leeuw, G. Kinne, S. Popp, T. Schulz, M. Stier, P. |
spellingShingle |
Schutgens, N. Dubovik, O. Hasekamp, O. Torres, O. Jethva, H. Leonard, P. Litvinov, P. Redemann, J. Shinozuka, Y. De Leeuw, G. Kinne, S. Popp, T. Schulz, M. Stier, P. AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements |
author_facet |
Schutgens, N. Dubovik, O. Hasekamp, O. Torres, O. Jethva, H. Leonard, P. Litvinov, P. Redemann, J. Shinozuka, Y. De Leeuw, G. Kinne, S. Popp, T. Schulz, M. Stier, P. |
author_sort |
Schutgens, N. |
title |
AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements |
title_short |
AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements |
title_full |
AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements |
title_fullStr |
AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements |
title_full_unstemmed |
AEROCOM and AEROSAT AAOD and SSA study - Part 1: Evaluation and intercomparison of satellite measurements |
title_sort |
aerocom and aerosat aaod and ssa study - part 1: evaluation and intercomparison of satellite measurements |
publishDate |
2021 |
url |
http://hdl.handle.net/21.11116/0000-0008-9918-1 http://hdl.handle.net/21.11116/0000-0008-991A-F http://hdl.handle.net/21.11116/0000-0008-991B-E |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-21-6895-2021 http://hdl.handle.net/21.11116/0000-0008-9918-1 http://hdl.handle.net/21.11116/0000-0008-991A-F http://hdl.handle.net/21.11116/0000-0008-991B-E |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5194/acp-21-6895-2021 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
21 |
container_issue |
9 |
container_start_page |
6895 |
op_container_end_page |
6917 |
_version_ |
1775352751859957760 |