Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic
Saharan dust was observed with shipborne lidar from 60° to 20°W along 14.5°N during a 1-month transatlantic cruise of the research vessel Meteor. About 4500 km off the coast of Africa, mean extinction and backscatter-related Ångström exponent of 0.1, wavelength-independent extinction-to-backscatter...
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ftdatacite:10.34657/1377 2023-05-15T13:06:16+02:00 Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic Kanitz, T. Engelmann, R. Heinold, B. Baars, H. Skupin, A. Ansmann, A. 2014 application/pdf https://dx.doi.org/10.34657/1377 https://oa.tib.eu/renate/handle/123456789/835 en eng Hoboken, NJ : Wiley Creative Commons Attribution Non Commercial No Derivatives 3.0 Unported CC BY-NC-ND 3.0 Unported https://creativecommons.org/licenses/by-nc-nd/3.0/legalcode cc-by-nc-nd-3.0 CC-BY-NC-ND Aerosol optical thickness Atmospheric residence time Backscatter coefficients Dust concentrations Extinction-to-backscatter ratio Lidar measurements Linear depolarization ratios Saharan dust 550 CreativeWork article 2014 ftdatacite https://doi.org/10.34657/1377 2022-03-10T12:43:22Z Saharan dust was observed with shipborne lidar from 60° to 20°W along 14.5°N during a 1-month transatlantic cruise of the research vessel Meteor. About 4500 km off the coast of Africa, mean extinction and backscatter-related Ångström exponent of 0.1, wavelength-independent extinction-to-backscatter ratios (lidar ratios) of around 45 sr, and particle linear depolarization ratio of 20% were found for aged dust (transport time >10 days). In contrast, dust with a shorter atmospheric residence time of 2–3 days showed Ångström exponents of −0.5 (backscatter coefficient) and 0.1 (extinction coefficient), mean lidar ratios of 64 and 50 sr, and particle linear depolarization ratios of 22 and 26% at 355 and 532 nm wavelength, respectively. Traces of fire smoke were also detected in the observed dust layers. The lidar observations were complemented by Aerosol Robotic Network handheld Sun photometer measurements, which revealed a mean total atmospheric column aerosol optical thickness of 0.05 for pure marine conditions (in the absence of lofted aerosol layers) and roughly 0.9 during a strong Saharan dust outbreak. The achieved data set was compared with first Consortium for Small Scale Modeling-Multi-Scale Chemistry Aerosol Transport simulations. The simulated vertical aerosol distribution showed good agreement with the lidar observations. Article in Journal/Newspaper Aerosol Robotic Network DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Aerosol optical thickness Atmospheric residence time Backscatter coefficients Dust concentrations Extinction-to-backscatter ratio Lidar measurements Linear depolarization ratios Saharan dust 550 |
spellingShingle |
Aerosol optical thickness Atmospheric residence time Backscatter coefficients Dust concentrations Extinction-to-backscatter ratio Lidar measurements Linear depolarization ratios Saharan dust 550 Kanitz, T. Engelmann, R. Heinold, B. Baars, H. Skupin, A. Ansmann, A. Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic |
topic_facet |
Aerosol optical thickness Atmospheric residence time Backscatter coefficients Dust concentrations Extinction-to-backscatter ratio Lidar measurements Linear depolarization ratios Saharan dust 550 |
description |
Saharan dust was observed with shipborne lidar from 60° to 20°W along 14.5°N during a 1-month transatlantic cruise of the research vessel Meteor. About 4500 km off the coast of Africa, mean extinction and backscatter-related Ångström exponent of 0.1, wavelength-independent extinction-to-backscatter ratios (lidar ratios) of around 45 sr, and particle linear depolarization ratio of 20% were found for aged dust (transport time >10 days). In contrast, dust with a shorter atmospheric residence time of 2–3 days showed Ångström exponents of −0.5 (backscatter coefficient) and 0.1 (extinction coefficient), mean lidar ratios of 64 and 50 sr, and particle linear depolarization ratios of 22 and 26% at 355 and 532 nm wavelength, respectively. Traces of fire smoke were also detected in the observed dust layers. The lidar observations were complemented by Aerosol Robotic Network handheld Sun photometer measurements, which revealed a mean total atmospheric column aerosol optical thickness of 0.05 for pure marine conditions (in the absence of lofted aerosol layers) and roughly 0.9 during a strong Saharan dust outbreak. The achieved data set was compared with first Consortium for Small Scale Modeling-Multi-Scale Chemistry Aerosol Transport simulations. The simulated vertical aerosol distribution showed good agreement with the lidar observations. |
format |
Article in Journal/Newspaper |
author |
Kanitz, T. Engelmann, R. Heinold, B. Baars, H. Skupin, A. Ansmann, A. |
author_facet |
Kanitz, T. Engelmann, R. Heinold, B. Baars, H. Skupin, A. Ansmann, A. |
author_sort |
Kanitz, T. |
title |
Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic |
title_short |
Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic |
title_full |
Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic |
title_fullStr |
Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic |
title_full_unstemmed |
Tracking the Saharan Air Layer with shipborne lidar across the tropical Atlantic |
title_sort |
tracking the saharan air layer with shipborne lidar across the tropical atlantic |
publisher |
Hoboken, NJ : Wiley |
publishDate |
2014 |
url |
https://dx.doi.org/10.34657/1377 https://oa.tib.eu/renate/handle/123456789/835 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_rights |
Creative Commons Attribution Non Commercial No Derivatives 3.0 Unported CC BY-NC-ND 3.0 Unported https://creativecommons.org/licenses/by-nc-nd/3.0/legalcode cc-by-nc-nd-3.0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.34657/1377 |
_version_ |
1765999049770532864 |