Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data
International audience A validation study is conducted regarding aerosol optical size property retrievals from measurements of the direct sun beam only (without the aid of diffuse radiation). The study focuses on using real data to test the new GRASP-AOD application, which uses only spectral optical...
Published in: | Atmospheric Measurement Techniques |
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ftunivlille:oai:HAL:insu-03686309v1 2024-06-23T07:45:00+00:00 Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data Torres, Benjamin Fuertes, David Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) Université de Lille ANR-11-LABX-0005,Cappa,Physiques et Chimie de l'Environnement Atmosphérique(2011) 2021 https://insu.hal.science/insu-03686309 https://insu.hal.science/insu-03686309/document https://insu.hal.science/insu-03686309/file/amt-14-4471-2021.pdf https://doi.org/10.5194/amt-14-4471-2021 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/amt-14-4471-2021 insu-03686309 https://insu.hal.science/insu-03686309 https://insu.hal.science/insu-03686309/document https://insu.hal.science/insu-03686309/file/amt-14-4471-2021.pdf BIBCODE: 2021AMT.14.4471T doi:10.5194/amt-14-4471-2021 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1867-1381 EISSN: 1867-8548 Atmospheric Measurement Techniques https://insu.hal.science/insu-03686309 Atmospheric Measurement Techniques, 2021, 14, pp.4471-4506. ⟨10.5194/amt-14-4471-2021⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2021 ftunivlille https://doi.org/10.5194/amt-14-4471-2021 2024-06-10T14:50:29Z International audience A validation study is conducted regarding aerosol optical size property retrievals from measurements of the direct sun beam only (without the aid of diffuse radiation). The study focuses on using real data to test the new GRASP-AOD application, which uses only spectral optical depth measurements to retrieve the total column aerosol size distributions, assumed to be bimodal lognormal. In addition, a set of secondary integral parameters of aerosol size distribution and optical properties are provided: effective radius, total volume concentration and fine-mode fraction of aerosol optical depth (AOD). The GRASP-AOD code is applied to almost 3 million observations acquired over 20 years (1997-2016) at 30 AERONET (Aerosol Robotic Network) sites. These validation sites have been selected based on known availability of an extensive data record, significant aerosol load variability throughout the year, wide worldwide coverage and diverse aerosol types and source regions. The output parameters are compared to those coming from the operational AERONET retrievals. The retrieved fine-mode fractions at 500 nm (τ f (500)) obtained by the GRASP-AOD application are compared to those retrieved by the spectral deconvolution algorithm (SDA) and by the AERONET aerosol retrieval algorithm. The size distribution properties obtained by the GRASP-AOD are compared to their equivalent values from the AERONET aerosol retrieval algorithm. The analysis showed the convincing capacity of the GRASP-AOD approach to successfully discriminate between fine- and coarse-mode extinction to robustly retrieve τ f (500). The comparisons of 2 million results of τ f (500) retrieval by the GRASP-AOD and SDA showed high correlation with a root mean square error (RMSE) of 0.015. Also, the analysis showed that the τ f (500) values computed by the AERONET aerosol retrieval algorithm agree slightly better with the GRASP-AOD (RMSE = 0.018, from 148 526 comparisons) than with the SDA (RMSE = 0.022, from 127 203 comparisons). The ... Article in Journal/Newspaper Aerosol Robotic Network LillOA (HAL Lille Open Archive, Université de Lille) Atmospheric Measurement Techniques 14 6 4471 4506 |
institution |
Open Polar |
collection |
LillOA (HAL Lille Open Archive, Université de Lille) |
op_collection_id |
ftunivlille |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Torres, Benjamin Fuertes, David Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience A validation study is conducted regarding aerosol optical size property retrievals from measurements of the direct sun beam only (without the aid of diffuse radiation). The study focuses on using real data to test the new GRASP-AOD application, which uses only spectral optical depth measurements to retrieve the total column aerosol size distributions, assumed to be bimodal lognormal. In addition, a set of secondary integral parameters of aerosol size distribution and optical properties are provided: effective radius, total volume concentration and fine-mode fraction of aerosol optical depth (AOD). The GRASP-AOD code is applied to almost 3 million observations acquired over 20 years (1997-2016) at 30 AERONET (Aerosol Robotic Network) sites. These validation sites have been selected based on known availability of an extensive data record, significant aerosol load variability throughout the year, wide worldwide coverage and diverse aerosol types and source regions. The output parameters are compared to those coming from the operational AERONET retrievals. The retrieved fine-mode fractions at 500 nm (τ f (500)) obtained by the GRASP-AOD application are compared to those retrieved by the spectral deconvolution algorithm (SDA) and by the AERONET aerosol retrieval algorithm. The size distribution properties obtained by the GRASP-AOD are compared to their equivalent values from the AERONET aerosol retrieval algorithm. The analysis showed the convincing capacity of the GRASP-AOD approach to successfully discriminate between fine- and coarse-mode extinction to robustly retrieve τ f (500). The comparisons of 2 million results of τ f (500) retrieval by the GRASP-AOD and SDA showed high correlation with a root mean square error (RMSE) of 0.015. Also, the analysis showed that the τ f (500) values computed by the AERONET aerosol retrieval algorithm agree slightly better with the GRASP-AOD (RMSE = 0.018, from 148 526 comparisons) than with the SDA (RMSE = 0.022, from 127 203 comparisons). The ... |
author2 |
Laboratoire d’Optique Atmosphérique - UMR 8518 (LOA) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) Université de Lille ANR-11-LABX-0005,Cappa,Physiques et Chimie de l'Environnement Atmosphérique(2011) |
format |
Article in Journal/Newspaper |
author |
Torres, Benjamin Fuertes, David |
author_facet |
Torres, Benjamin Fuertes, David |
author_sort |
Torres, Benjamin |
title |
Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data |
title_short |
Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data |
title_full |
Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data |
title_fullStr |
Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data |
title_full_unstemmed |
Characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the GRASP-AOD code using long-term AERONET data |
title_sort |
characterization of aerosol size properties from measurements of spectral optical depth: a global validation of the grasp-aod code using long-term aeronet data |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://insu.hal.science/insu-03686309 https://insu.hal.science/insu-03686309/document https://insu.hal.science/insu-03686309/file/amt-14-4471-2021.pdf https://doi.org/10.5194/amt-14-4471-2021 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
ISSN: 1867-1381 EISSN: 1867-8548 Atmospheric Measurement Techniques https://insu.hal.science/insu-03686309 Atmospheric Measurement Techniques, 2021, 14, pp.4471-4506. ⟨10.5194/amt-14-4471-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/amt-14-4471-2021 insu-03686309 https://insu.hal.science/insu-03686309 https://insu.hal.science/insu-03686309/document https://insu.hal.science/insu-03686309/file/amt-14-4471-2021.pdf BIBCODE: 2021AMT.14.4471T doi:10.5194/amt-14-4471-2021 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/amt-14-4471-2021 |
container_title |
Atmospheric Measurement Techniques |
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14 |
container_issue |
6 |
container_start_page |
4471 |
op_container_end_page |
4506 |
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1802645460826980352 |