First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust
Two layers of Saharan dust observed over Leipzig, Germany, in February and March 2021 were used to provide the first-ever lidar measurements of the dust lidar ratio (extinction-to-backscatter ratio) and linear depolarization ratio at all three classical lidar wavelengths (355, 532 and 1064 nm). The...
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ftdoajarticles:oai:doaj.org/article:2f5019a65a7b41548e09ef815d6564be 2023-05-15T13:06:44+02:00 First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust M. Haarig A. Ansmann R. Engelmann H. Baars C. Toledano B. Torres D. Althausen M. Radenz U. Wandinger 2022-01-01T00:00:00Z https://doi.org/10.5194/acp-22-355-2022 https://doaj.org/article/2f5019a65a7b41548e09ef815d6564be EN eng Copernicus Publications https://acp.copernicus.org/articles/22/355/2022/acp-22-355-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-355-2022 1680-7316 1680-7324 https://doaj.org/article/2f5019a65a7b41548e09ef815d6564be Atmospheric Chemistry and Physics, Vol 22, Pp 355-369 (2022) Physics QC1-999 Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.5194/acp-22-355-2022 2022-12-30T20:23:39Z Two layers of Saharan dust observed over Leipzig, Germany, in February and March 2021 were used to provide the first-ever lidar measurements of the dust lidar ratio (extinction-to-backscatter ratio) and linear depolarization ratio at all three classical lidar wavelengths (355, 532 and 1064 nm). The pure-dust conditions during the first event exhibit lidar ratios of 47 ± 8, 50 ± 5 and 69 ± 14 sr and particle linear depolarization ratios of 0.242 ± 0.024, 0.299 ± 0.018 and 0.206 ± 0.010 at wavelengths of 355, 532 and 1064 nm, respectively. The second, slightly polluted-dust case shows a similar spectral behavior of the lidar and depolarization ratio with values of the lidar ratio of 49 ± 4, 46 ± 5 and 57 ± 9 sr and the depolarization ratio of 0.174 ± 0.041, 0.298 ± 0.016 and 0.242 ± 0.007 at 355, 532 and 1064 nm, respectively. The results were compared with Aerosol Robotic Network (AERONET) version 3 (v3) inversion solutions and the Generalized Retrieval of Aerosol and Surface Properties (GRASP) at six and seven wavelengths. Both retrieval schemes make use of a spheroid shape model for mineral dust. The spectral slope of the lidar ratio from 532 to 1064 nm could be well reproduced by the AERONET and GRASP retrieval schemes. Higher lidar ratios in the UV were retrieved by AERONET and GRASP. The enhancement was probably caused by the influence of fine-mode pollution particles in the boundary layer which are included in the columnar photometer measurements. Significant differences between the measured and retrieved wavelength dependence of the particle linear depolarization ratio were found. The potential sources for these uncertainties are discussed. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 22 1 355 369 |
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Directory of Open Access Journals: DOAJ Articles |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 M. Haarig A. Ansmann R. Engelmann H. Baars C. Toledano B. Torres D. Althausen M. Radenz U. Wandinger First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Two layers of Saharan dust observed over Leipzig, Germany, in February and March 2021 were used to provide the first-ever lidar measurements of the dust lidar ratio (extinction-to-backscatter ratio) and linear depolarization ratio at all three classical lidar wavelengths (355, 532 and 1064 nm). The pure-dust conditions during the first event exhibit lidar ratios of 47 ± 8, 50 ± 5 and 69 ± 14 sr and particle linear depolarization ratios of 0.242 ± 0.024, 0.299 ± 0.018 and 0.206 ± 0.010 at wavelengths of 355, 532 and 1064 nm, respectively. The second, slightly polluted-dust case shows a similar spectral behavior of the lidar and depolarization ratio with values of the lidar ratio of 49 ± 4, 46 ± 5 and 57 ± 9 sr and the depolarization ratio of 0.174 ± 0.041, 0.298 ± 0.016 and 0.242 ± 0.007 at 355, 532 and 1064 nm, respectively. The results were compared with Aerosol Robotic Network (AERONET) version 3 (v3) inversion solutions and the Generalized Retrieval of Aerosol and Surface Properties (GRASP) at six and seven wavelengths. Both retrieval schemes make use of a spheroid shape model for mineral dust. The spectral slope of the lidar ratio from 532 to 1064 nm could be well reproduced by the AERONET and GRASP retrieval schemes. Higher lidar ratios in the UV were retrieved by AERONET and GRASP. The enhancement was probably caused by the influence of fine-mode pollution particles in the boundary layer which are included in the columnar photometer measurements. Significant differences between the measured and retrieved wavelength dependence of the particle linear depolarization ratio were found. The potential sources for these uncertainties are discussed. |
format |
Article in Journal/Newspaper |
author |
M. Haarig A. Ansmann R. Engelmann H. Baars C. Toledano B. Torres D. Althausen M. Radenz U. Wandinger |
author_facet |
M. Haarig A. Ansmann R. Engelmann H. Baars C. Toledano B. Torres D. Althausen M. Radenz U. Wandinger |
author_sort |
M. Haarig |
title |
First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust |
title_short |
First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust |
title_full |
First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust |
title_fullStr |
First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust |
title_full_unstemmed |
First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust |
title_sort |
first triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of saharan dust |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-355-2022 https://doaj.org/article/2f5019a65a7b41548e09ef815d6564be |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics, Vol 22, Pp 355-369 (2022) |
op_relation |
https://acp.copernicus.org/articles/22/355/2022/acp-22-355-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-355-2022 1680-7316 1680-7324 https://doaj.org/article/2f5019a65a7b41548e09ef815d6564be |
op_doi |
https://doi.org/10.5194/acp-22-355-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
1 |
container_start_page |
355 |
op_container_end_page |
369 |
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1766018550998237184 |