Evaluation of IASI-derived dust aerosol characteristics over the tropical belt
International audience IASI (Infrared Atmospheric Sounder Interferometer)-derived monthly mean infrared (10 μm) dust aerosol optical depth (AOD) and altitude are evaluated against ground-based Aerosol RObotic NETwork of sun photometers (AERONET) measurements of the 500 nm coarse-mode AOD and CALIOP...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
|
Subjects: | |
Online Access: | https://hal.science/hal-04114614 https://hal.science/hal-04114614/document https://hal.science/hal-04114614/file/acp-14-9343-2014.pdf https://doi.org/10.5194/acp-14-9343-2014 |
id |
ftsorbonneuniv:oai:HAL:hal-04114614v1 |
---|---|
record_format |
openpolar |
spelling |
ftsorbonneuniv:oai:HAL:hal-04114614v1 2024-06-09T07:37:54+00:00 Evaluation of IASI-derived dust aerosol characteristics over the tropical belt Capelle, V. Chédin, A. Siméon, M. Tsamalis, C. Pierangelo, C. Pondrom, M. Crevoisier, C. Crepeau, L. Scott, N. A. Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Centre National d'Études Spatiales Toulouse (CNES) 2014 https://hal.science/hal-04114614 https://hal.science/hal-04114614/document https://hal.science/hal-04114614/file/acp-14-9343-2014.pdf https://doi.org/10.5194/acp-14-9343-2014 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-14-9343-2014 hal-04114614 https://hal.science/hal-04114614 https://hal.science/hal-04114614/document https://hal.science/hal-04114614/file/acp-14-9343-2014.pdf BIBCODE: 2014ACP.14.9343C doi:10.5194/acp-14-9343-2014 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-04114614 Atmospheric Chemistry and Physics, 2014, 14, pp.9343-9362. ⟨10.5194/acp-14-9343-2014⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2014 ftsorbonneuniv https://doi.org/10.5194/acp-14-9343-2014 2024-05-16T23:52:45Z International audience IASI (Infrared Atmospheric Sounder Interferometer)-derived monthly mean infrared (10 μm) dust aerosol optical depth (AOD) and altitude are evaluated against ground-based Aerosol RObotic NETwork of sun photometers (AERONET) measurements of the 500 nm coarse-mode AOD and CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) measurements of altitude at 38 AERONET sites (sea and land) within the tropical belt (30° N-30° S). The period covered extends from July 2007 to June 2013. The evaluation goes through the analysis of Taylor diagrams and box-and-whiskers plots, separating situations over oceanic regions and over land. For the AOD, such an evaluation raises the problem of the difference between the two spectral domains used: infrared for IASI and visible for AERONET. Consequently, the two measurements do not share the same metrics. For that reason, AERONET coarse-mode AOD is first "translated" into IASI-equivalent infrared AOD. This is done by the determination, site by site, of an infrared to visible AOD ratio. Because translating visible coarse-mode AOD into infrared AOD requires accurate knowledge of variables, such as the infrared refractive index or the particle size distribution, quantifying the bias between these two sources of AOD is not straightforward. This problem is detailed in this paper, in particular in Appendix A. For the sites over oceanic regions, the overall AOD temporal correlation comes to 0.86 for 786 items (IASI and AERONET monthly mean bins). The overall normalized standard deviation (i.e. ratio of the standard deviation of the test data (IASI) to that of the reference data (AERONET)) is 0.93, close to the desired value of 1. Over land, essentially desert, correlation is 0.74 for 619 items and the normalized standard deviation is 0.86. This slight but significant degradation over land most probably results from the greater complexity of the surface (heterogeneity, elevation) and, to a lesser extent, to the episodic presence of dust within the boundary layer ... Article in Journal/Newspaper Aerosol Robotic Network HAL Sorbonne Université Atmospheric Chemistry and Physics 14 17 9343 9362 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Capelle, V. Chédin, A. Siméon, M. Tsamalis, C. Pierangelo, C. Pondrom, M. Crevoisier, C. Crepeau, L. Scott, N. A. Evaluation of IASI-derived dust aerosol characteristics over the tropical belt |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience IASI (Infrared Atmospheric Sounder Interferometer)-derived monthly mean infrared (10 μm) dust aerosol optical depth (AOD) and altitude are evaluated against ground-based Aerosol RObotic NETwork of sun photometers (AERONET) measurements of the 500 nm coarse-mode AOD and CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) measurements of altitude at 38 AERONET sites (sea and land) within the tropical belt (30° N-30° S). The period covered extends from July 2007 to June 2013. The evaluation goes through the analysis of Taylor diagrams and box-and-whiskers plots, separating situations over oceanic regions and over land. For the AOD, such an evaluation raises the problem of the difference between the two spectral domains used: infrared for IASI and visible for AERONET. Consequently, the two measurements do not share the same metrics. For that reason, AERONET coarse-mode AOD is first "translated" into IASI-equivalent infrared AOD. This is done by the determination, site by site, of an infrared to visible AOD ratio. Because translating visible coarse-mode AOD into infrared AOD requires accurate knowledge of variables, such as the infrared refractive index or the particle size distribution, quantifying the bias between these two sources of AOD is not straightforward. This problem is detailed in this paper, in particular in Appendix A. For the sites over oceanic regions, the overall AOD temporal correlation comes to 0.86 for 786 items (IASI and AERONET monthly mean bins). The overall normalized standard deviation (i.e. ratio of the standard deviation of the test data (IASI) to that of the reference data (AERONET)) is 0.93, close to the desired value of 1. Over land, essentially desert, correlation is 0.74 for 619 items and the normalized standard deviation is 0.86. This slight but significant degradation over land most probably results from the greater complexity of the surface (heterogeneity, elevation) and, to a lesser extent, to the episodic presence of dust within the boundary layer ... |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Centre National d'Études Spatiales Toulouse (CNES) |
format |
Article in Journal/Newspaper |
author |
Capelle, V. Chédin, A. Siméon, M. Tsamalis, C. Pierangelo, C. Pondrom, M. Crevoisier, C. Crepeau, L. Scott, N. A. |
author_facet |
Capelle, V. Chédin, A. Siméon, M. Tsamalis, C. Pierangelo, C. Pondrom, M. Crevoisier, C. Crepeau, L. Scott, N. A. |
author_sort |
Capelle, V. |
title |
Evaluation of IASI-derived dust aerosol characteristics over the tropical belt |
title_short |
Evaluation of IASI-derived dust aerosol characteristics over the tropical belt |
title_full |
Evaluation of IASI-derived dust aerosol characteristics over the tropical belt |
title_fullStr |
Evaluation of IASI-derived dust aerosol characteristics over the tropical belt |
title_full_unstemmed |
Evaluation of IASI-derived dust aerosol characteristics over the tropical belt |
title_sort |
evaluation of iasi-derived dust aerosol characteristics over the tropical belt |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-04114614 https://hal.science/hal-04114614/document https://hal.science/hal-04114614/file/acp-14-9343-2014.pdf https://doi.org/10.5194/acp-14-9343-2014 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-04114614 Atmospheric Chemistry and Physics, 2014, 14, pp.9343-9362. ⟨10.5194/acp-14-9343-2014⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-14-9343-2014 hal-04114614 https://hal.science/hal-04114614 https://hal.science/hal-04114614/document https://hal.science/hal-04114614/file/acp-14-9343-2014.pdf BIBCODE: 2014ACP.14.9343C doi:10.5194/acp-14-9343-2014 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-14-9343-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
17 |
container_start_page |
9343 |
op_container_end_page |
9362 |
_version_ |
1801378719460229120 |