Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG
The Spinning Enhanced Visible and InfraRed Imager (SEVIRI) aboard Meteosat Second Generation (MSG) launched in 2003 by EUMETSAT is dedicated to the Nowcasting applications and Numerical Weather Prediction and to the provision of observations for climate monitoring and research. We use the data in vi...
Published in: | Atmospheric Measurement Techniques |
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2011
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00026518 2023-05-15T13:07:15+02:00 Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG Bernard, E. Moulin, C. Ramon, D. Jolivet, D. Riedi, J. Nicolas, J.-M. 2011-11 electronic https://doi.org/10.5194/amt-4-2543-2011 https://noa.gwlb.de/receive/cop_mods_00026518 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026473/amt-4-2543-2011.pdf https://amt.copernicus.org/articles/4/2543/2011/amt-4-2543-2011.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-4-2543-2011 https://noa.gwlb.de/receive/cop_mods_00026518 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026473/amt-4-2543-2011.pdf https://amt.copernicus.org/articles/4/2543/2011/amt-4-2543-2011.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2011 ftnonlinearchiv https://doi.org/10.5194/amt-4-2543-2011 2022-02-08T22:49:10Z The Spinning Enhanced Visible and InfraRed Imager (SEVIRI) aboard Meteosat Second Generation (MSG) launched in 2003 by EUMETSAT is dedicated to the Nowcasting applications and Numerical Weather Prediction and to the provision of observations for climate monitoring and research. We use the data in visible and near infrared (NIR) channels to derive the aerosol optical thickness (AOT) over land. The algorithm is based on the assumption that the top of the atmosphere (TOA) reflectance increases with the aerosol load. This is a reasonable assumption except in case of absorbing aerosols above bright surfaces. We assume that the minimum in a 14-days time series of the TOA reflectance is, once corrected from gaseous scattering and absorption, representative of the surface reflectance. The AOT and the aerosol model (a set of 5 models is used), are retrieved by matching the simulated TOA reflectance with the TOA reflectances measured by SEVIRI in its visible and NIR spectral bands. The high temporal resolution of the data acquisition by SEVIRI allows to retrieve the AOT every 15 min with a spatial resolution of 3 km at sub-satellite point, over the entire SEVIRI disk covering Europe, Africa and part of South America. The resulting AOT, a level 2 product at the native temporal and spatial SEVIRI resolutions, is presented and evaluated in this paper. The AOT has been validated using ground based measurements from AErosol RObotic NETwork (AERONET), a sun-photometer network, focusing over Europe for 3 months in 2006. The SEVIRI estimates correlate well with the AERONET measurements, r = 0.64, with a slight overestimate, bias = −0.017. The sources of errors are mainly the cloud contamination and the bad estimation of the surface reflectance. The temporal evolutions exhibited by both datasets show very good agreement which allows to conclude that the AOT Level 2 product from SEVIRI can be used to quantify the aerosol content and to monitor its daily evolution with a high temporal frequency. The comparison with daily maps of Moderate Resolution Imaging Spectroradiometer (MODIS) AOT level 3 product shows qualitative good agreement in the retrieved geographic patterns of AOT. Given the high spatial and temporal resolutions obtained with this approach, our results have clear potential for applications ranging from air quality monitoring to climate studies. This paper presents a first evaluation and validation of the derived AOT over Europe in order to document the overall quality of a product that will be made publicly available to the users of the aforementioned research communities. Article in Journal/Newspaper Aerosol Robotic Network Niedersächsisches Online-Archiv NOA Atmospheric Measurement Techniques 4 11 2543 2565 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Bernard, E. Moulin, C. Ramon, D. Jolivet, D. Riedi, J. Nicolas, J.-M. Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG |
topic_facet |
article Verlagsveröffentlichung |
description |
The Spinning Enhanced Visible and InfraRed Imager (SEVIRI) aboard Meteosat Second Generation (MSG) launched in 2003 by EUMETSAT is dedicated to the Nowcasting applications and Numerical Weather Prediction and to the provision of observations for climate monitoring and research. We use the data in visible and near infrared (NIR) channels to derive the aerosol optical thickness (AOT) over land. The algorithm is based on the assumption that the top of the atmosphere (TOA) reflectance increases with the aerosol load. This is a reasonable assumption except in case of absorbing aerosols above bright surfaces. We assume that the minimum in a 14-days time series of the TOA reflectance is, once corrected from gaseous scattering and absorption, representative of the surface reflectance. The AOT and the aerosol model (a set of 5 models is used), are retrieved by matching the simulated TOA reflectance with the TOA reflectances measured by SEVIRI in its visible and NIR spectral bands. The high temporal resolution of the data acquisition by SEVIRI allows to retrieve the AOT every 15 min with a spatial resolution of 3 km at sub-satellite point, over the entire SEVIRI disk covering Europe, Africa and part of South America. The resulting AOT, a level 2 product at the native temporal and spatial SEVIRI resolutions, is presented and evaluated in this paper. The AOT has been validated using ground based measurements from AErosol RObotic NETwork (AERONET), a sun-photometer network, focusing over Europe for 3 months in 2006. The SEVIRI estimates correlate well with the AERONET measurements, r = 0.64, with a slight overestimate, bias = −0.017. The sources of errors are mainly the cloud contamination and the bad estimation of the surface reflectance. The temporal evolutions exhibited by both datasets show very good agreement which allows to conclude that the AOT Level 2 product from SEVIRI can be used to quantify the aerosol content and to monitor its daily evolution with a high temporal frequency. The comparison with daily maps of Moderate Resolution Imaging Spectroradiometer (MODIS) AOT level 3 product shows qualitative good agreement in the retrieved geographic patterns of AOT. Given the high spatial and temporal resolutions obtained with this approach, our results have clear potential for applications ranging from air quality monitoring to climate studies. This paper presents a first evaluation and validation of the derived AOT over Europe in order to document the overall quality of a product that will be made publicly available to the users of the aforementioned research communities. |
format |
Article in Journal/Newspaper |
author |
Bernard, E. Moulin, C. Ramon, D. Jolivet, D. Riedi, J. Nicolas, J.-M. |
author_facet |
Bernard, E. Moulin, C. Ramon, D. Jolivet, D. Riedi, J. Nicolas, J.-M. |
author_sort |
Bernard, E. |
title |
Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG |
title_short |
Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG |
title_full |
Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG |
title_fullStr |
Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG |
title_full_unstemmed |
Description and validation of an AOT product over land at the 0.6 μm channel of the SEVIRI sensor onboard MSG |
title_sort |
description and validation of an aot product over land at the 0.6 μm channel of the seviri sensor onboard msg |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/amt-4-2543-2011 https://noa.gwlb.de/receive/cop_mods_00026518 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026473/amt-4-2543-2011.pdf https://amt.copernicus.org/articles/4/2543/2011/amt-4-2543-2011.pdf |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-4-2543-2011 https://noa.gwlb.de/receive/cop_mods_00026518 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00026473/amt-4-2543-2011.pdf https://amt.copernicus.org/articles/4/2543/2011/amt-4-2543-2011.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/amt-4-2543-2011 |
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Atmospheric Measurement Techniques |
container_volume |
4 |
container_issue |
11 |
container_start_page |
2543 |
op_container_end_page |
2565 |
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1766042459608973312 |