Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry
Arctic boundary-layer clouds in the vicinity of Svalbard (78° N, 15° E) were observed with airborne remote sensing and in situ methods. The cloud optical thickness and the droplet effective radius are retrieved from spectral radiance data from the nadir spot (1.5°, 350–2100 nm) and from a nadir-cent...
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ftdoajarticles:oai:doaj.org/article:f09b8472eb314b2f970c0efe24c9096a 2023-05-15T14:55:11+02:00 Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry E. Bierwirth A. Ehrlich M. Wendisch J.-F. Gayet C. Gourbeyre R. Dupuy A. Herber R. Neuber A. Lampert 2013-05-01T00:00:00Z https://doi.org/10.5194/amt-6-1189-2013 https://doaj.org/article/f09b8472eb314b2f970c0efe24c9096a EN eng Copernicus Publications http://www.atmos-meas-tech.net/6/1189/2013/amt-6-1189-2013.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-6-1189-2013 1867-1381 1867-8548 https://doaj.org/article/f09b8472eb314b2f970c0efe24c9096a Atmospheric Measurement Techniques, Vol 6, Iss 5, Pp 1189-1200 (2013) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2013 ftdoajarticles https://doi.org/10.5194/amt-6-1189-2013 2022-12-31T07:23:45Z Arctic boundary-layer clouds in the vicinity of Svalbard (78° N, 15° E) were observed with airborne remote sensing and in situ methods. The cloud optical thickness and the droplet effective radius are retrieved from spectral radiance data from the nadir spot (1.5°, 350–2100 nm) and from a nadir-centred image (40°, 400–1000 nm). Two approaches are used for the nadir retrieval, combining the signal from either two or five wavelengths. Two wavelengths are found to be sufficient for an accurate retrieval of the cloud optical thickness, while the retrieval of droplet effective radius is more sensitive to the number of wavelengths. Even with the comparison to in-situ data, it is not possible to definitely answer the question which method is better. This is due to unavoidable time delays between the in-situ measurements and the remote-sensing observations, and to the scarcity of vertical in-situ profiles within the cloud. Article in Journal/Newspaper Arctic Svalbard Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Atmospheric Measurement Techniques 6 5 1189 1200 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 E. Bierwirth A. Ehrlich M. Wendisch J.-F. Gayet C. Gourbeyre R. Dupuy A. Herber R. Neuber A. Lampert Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
Arctic boundary-layer clouds in the vicinity of Svalbard (78° N, 15° E) were observed with airborne remote sensing and in situ methods. The cloud optical thickness and the droplet effective radius are retrieved from spectral radiance data from the nadir spot (1.5°, 350–2100 nm) and from a nadir-centred image (40°, 400–1000 nm). Two approaches are used for the nadir retrieval, combining the signal from either two or five wavelengths. Two wavelengths are found to be sufficient for an accurate retrieval of the cloud optical thickness, while the retrieval of droplet effective radius is more sensitive to the number of wavelengths. Even with the comparison to in-situ data, it is not possible to definitely answer the question which method is better. This is due to unavoidable time delays between the in-situ measurements and the remote-sensing observations, and to the scarcity of vertical in-situ profiles within the cloud. |
format |
Article in Journal/Newspaper |
author |
E. Bierwirth A. Ehrlich M. Wendisch J.-F. Gayet C. Gourbeyre R. Dupuy A. Herber R. Neuber A. Lampert |
author_facet |
E. Bierwirth A. Ehrlich M. Wendisch J.-F. Gayet C. Gourbeyre R. Dupuy A. Herber R. Neuber A. Lampert |
author_sort |
E. Bierwirth |
title |
Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
title_short |
Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
title_full |
Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
title_fullStr |
Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
title_full_unstemmed |
Optical thickness and effective radius of Arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
title_sort |
optical thickness and effective radius of arctic boundary-layer clouds retrieved from airborne nadir and imaging spectrometry |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/amt-6-1189-2013 https://doaj.org/article/f09b8472eb314b2f970c0efe24c9096a |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Svalbard |
genre_facet |
Arctic Svalbard |
op_source |
Atmospheric Measurement Techniques, Vol 6, Iss 5, Pp 1189-1200 (2013) |
op_relation |
http://www.atmos-meas-tech.net/6/1189/2013/amt-6-1189-2013.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-6-1189-2013 1867-1381 1867-8548 https://doaj.org/article/f09b8472eb314b2f970c0efe24c9096a |
op_doi |
https://doi.org/10.5194/amt-6-1189-2013 |
container_title |
Atmospheric Measurement Techniques |
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6 |
container_issue |
5 |
container_start_page |
1189 |
op_container_end_page |
1200 |
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1766326976650412032 |