Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007
Data sets from CloudSat radar reflectivity and CALIPSO lidar backscattering measurements provide a new regard on Arctic and Antarctic winter cloud systems, as well as on the way aerosols determine their formation and evolution. Especially, links between the cloud ice crystal size and the surrounding...
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ftunivquebec:oai:www.archipel.uqam.ca:8218 2023-05-15T13:36:52+02:00 Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 Grenier, Patrick Blanchet, Jean‐Pierre Muñoz‐Alpizar, Rodrigo 2009-05 application/pdf http://www.archipel.uqam.ca/8218/1/Grenier_et_al_JGR_Atmosphere_2009_D09201.pdf en eng http://www.archipel.uqam.ca/8218/ http://dx.doi.org/10.1029/2008JD010927 doi:10.1029/2008JD010927 Ice cloud aerosol Article de revue scientifique PeerReviewed 2009 ftunivquebec https://doi.org/10.1029/2008JD010927 2016-08-20T07:50:31Z Data sets from CloudSat radar reflectivity and CALIPSO lidar backscattering measurements provide a new regard on Arctic and Antarctic winter cloud systems, as well as on the way aerosols determine their formation and evolution. Especially, links between the cloud ice crystal size and the surrounding aerosol field may be further investigated. In this study, the satellite observations are used to heuristically separate polar thin ice clouds into two crystal size categories, and an aerosol index based on the attenuated backscattering and color ratio of the sampled volumes is used for identifying haze in cloud-free regions. Statistics from 386 Arctic satellite overpasses during January 2007 and from 379 overpasses over Antarctica during July 2007 reveal that sectors with the highest proportion of thin ice clouds having large ice crystals at their top are those for which the aerosol index is highest. Moreover, a weak but significant correlation between the cloud top ice effective radius and the above-cloud aerosol index suggests that more polluted clouds tend to have higher ice effective radius, in 10 of the 11 sectors investigated. These results are interpreted in terms of a sulphate-induced freezing inhibition effect. Text Antarc* Antarctic Antarctica Arctic UQAM - Université du Québec à Montréal: archipel Antarctic Arctic Midwinter ENVELOPE(139.931,139.931,-66.690,-66.690) Journal of Geophysical Research 114 D9 |
institution |
Open Polar |
collection |
UQAM - Université du Québec à Montréal: archipel |
op_collection_id |
ftunivquebec |
language |
English |
topic |
Ice cloud aerosol |
spellingShingle |
Ice cloud aerosol Grenier, Patrick Blanchet, Jean‐Pierre Muñoz‐Alpizar, Rodrigo Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 |
topic_facet |
Ice cloud aerosol |
description |
Data sets from CloudSat radar reflectivity and CALIPSO lidar backscattering measurements provide a new regard on Arctic and Antarctic winter cloud systems, as well as on the way aerosols determine their formation and evolution. Especially, links between the cloud ice crystal size and the surrounding aerosol field may be further investigated. In this study, the satellite observations are used to heuristically separate polar thin ice clouds into two crystal size categories, and an aerosol index based on the attenuated backscattering and color ratio of the sampled volumes is used for identifying haze in cloud-free regions. Statistics from 386 Arctic satellite overpasses during January 2007 and from 379 overpasses over Antarctica during July 2007 reveal that sectors with the highest proportion of thin ice clouds having large ice crystals at their top are those for which the aerosol index is highest. Moreover, a weak but significant correlation between the cloud top ice effective radius and the above-cloud aerosol index suggests that more polluted clouds tend to have higher ice effective radius, in 10 of the 11 sectors investigated. These results are interpreted in terms of a sulphate-induced freezing inhibition effect. |
format |
Text |
author |
Grenier, Patrick Blanchet, Jean‐Pierre Muñoz‐Alpizar, Rodrigo |
author_facet |
Grenier, Patrick Blanchet, Jean‐Pierre Muñoz‐Alpizar, Rodrigo |
author_sort |
Grenier, Patrick |
title |
Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 |
title_short |
Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 |
title_full |
Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 |
title_fullStr |
Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 |
title_full_unstemmed |
Study of polar thin ice clouds and aerosols seen by CloudSat and CALIPSO during midwinter 2007 |
title_sort |
study of polar thin ice clouds and aerosols seen by cloudsat and calipso during midwinter 2007 |
publishDate |
2009 |
url |
http://www.archipel.uqam.ca/8218/1/Grenier_et_al_JGR_Atmosphere_2009_D09201.pdf |
long_lat |
ENVELOPE(139.931,139.931,-66.690,-66.690) |
geographic |
Antarctic Arctic Midwinter |
geographic_facet |
Antarctic Arctic Midwinter |
genre |
Antarc* Antarctic Antarctica Arctic |
genre_facet |
Antarc* Antarctic Antarctica Arctic |
op_relation |
http://www.archipel.uqam.ca/8218/ http://dx.doi.org/10.1029/2008JD010927 doi:10.1029/2008JD010927 |
op_doi |
https://doi.org/10.1029/2008JD010927 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
D9 |
_version_ |
1766085046462054400 |