Optically thin ice clouds in Arctic : Formation processes
International audience Arctic ice cloud formation during winter is poorly understood mainly due to lack of observations and the remoteness of this region. Their influence on Northern Hemisphere weather and climate is of paramount importance, and the modification of their properties, linked to aeroso...
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ftuniversailles:oai:HAL:hal-04115199v1 2023-07-30T04:01:05+02:00 Optically thin ice clouds in Arctic : Formation processes Jouan, Caroline Girard, Eric Pelon, Jacques Blanchet, Jean-Pierre Wobrock, W. Gultepe, I. Gayet, Jean-François Delanoë, Julien Mioche, G. Adam de Villiers, Raphaël SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université du Québec à Montréal = University of Québec in Montréal (UQAM) Laboratoire de météorologie physique (LaMP) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Environment and Climate Change Canada Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) San Francisco California, United States 2010-12 https://hal.science/hal-04115199 en eng HAL CCSD hal-04115199 https://hal.science/hal-04115199 BIBCODE: 2010AGUFM.A52B.07J American Geophysical Union Fall Meeting 2010 https://hal.science/hal-04115199 American Geophysical Union Fall Meeting 2010, Dec 2010, San Francisco California, United States. pp.abstract id. A52B-07 Cloud physics and chemistry Instruments and techniques [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2010 ftuniversailles 2023-07-16T20:20:09Z International audience Arctic ice cloud formation during winter is poorly understood mainly due to lack of observations and the remoteness of this region. Their influence on Northern Hemisphere weather and climate is of paramount importance, and the modification of their properties, linked to aerosol-cloud interaction processes, needs to be better understood. Large concentration of aerosols in the Arctic during winter is associated to long-range transport of anthropogenic aerosols from the mid-latitudes to the Arctic. Observations show that sulphuric acid coats most of these aerosols. Laboratory and in-situ measurements show that at cold temperature (<-30°C), acidic coating lowers the freezing point and deactivates ice nuclei (IN). Therefore, the IN concentration is reduced in these regions and there is less competition for the same available moisture. As a result, large ice crystals form in relatively small concentrations. It is hypothesized that the observed low concentration of large ice crystals in thin ice clouds is linked to the acidification of aerosols. Extensive measurements from ground-based sites and satellite remote sensing (CloudSat and CALIPSO) reveal the existence of two types of extended optically thin ice clouds (TICs) in the Arctic during the polar night and early spring. The first type (TIC-1) is seen only by the lidar, but not the radar, and is found in pristine environment whereas the second type (TIC-2) is detected by both sensors, and is associated with high concentration of aerosols, possibly anthropogenic. TIC-2 is characterized by a low concentration of ice crystals that are large enough to precipitate. To further investigate the interactions between TICs clouds and aerosols, in-situ, airborne and satellite measurements of specific cases observed during the POLARCAT and ISDAC field experiments are analyzed. These two field campaigns took place respectively over the North Slope of Alaska and Northern part of Sweden in April 2008. Analysis of cloud type can be done from these ... Conference Object Arctic north slope polar night Alaska Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Arctic |
institution |
Open Polar |
collection |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
op_collection_id |
ftuniversailles |
language |
English |
topic |
Cloud physics and chemistry Instruments and techniques [SDU]Sciences of the Universe [physics] |
spellingShingle |
Cloud physics and chemistry Instruments and techniques [SDU]Sciences of the Universe [physics] Jouan, Caroline Girard, Eric Pelon, Jacques Blanchet, Jean-Pierre Wobrock, W. Gultepe, I. Gayet, Jean-François Delanoë, Julien Mioche, G. Adam de Villiers, Raphaël Optically thin ice clouds in Arctic : Formation processes |
topic_facet |
Cloud physics and chemistry Instruments and techniques [SDU]Sciences of the Universe [physics] |
description |
International audience Arctic ice cloud formation during winter is poorly understood mainly due to lack of observations and the remoteness of this region. Their influence on Northern Hemisphere weather and climate is of paramount importance, and the modification of their properties, linked to aerosol-cloud interaction processes, needs to be better understood. Large concentration of aerosols in the Arctic during winter is associated to long-range transport of anthropogenic aerosols from the mid-latitudes to the Arctic. Observations show that sulphuric acid coats most of these aerosols. Laboratory and in-situ measurements show that at cold temperature (<-30°C), acidic coating lowers the freezing point and deactivates ice nuclei (IN). Therefore, the IN concentration is reduced in these regions and there is less competition for the same available moisture. As a result, large ice crystals form in relatively small concentrations. It is hypothesized that the observed low concentration of large ice crystals in thin ice clouds is linked to the acidification of aerosols. Extensive measurements from ground-based sites and satellite remote sensing (CloudSat and CALIPSO) reveal the existence of two types of extended optically thin ice clouds (TICs) in the Arctic during the polar night and early spring. The first type (TIC-1) is seen only by the lidar, but not the radar, and is found in pristine environment whereas the second type (TIC-2) is detected by both sensors, and is associated with high concentration of aerosols, possibly anthropogenic. TIC-2 is characterized by a low concentration of ice crystals that are large enough to precipitate. To further investigate the interactions between TICs clouds and aerosols, in-situ, airborne and satellite measurements of specific cases observed during the POLARCAT and ISDAC field experiments are analyzed. These two field campaigns took place respectively over the North Slope of Alaska and Northern part of Sweden in April 2008. Analysis of cloud type can be done from these ... |
author2 |
SPACE - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Université du Québec à Montréal = University of Québec in Montréal (UQAM) Laboratoire de météorologie physique (LaMP) Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Environment and Climate Change Canada Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Jouan, Caroline Girard, Eric Pelon, Jacques Blanchet, Jean-Pierre Wobrock, W. Gultepe, I. Gayet, Jean-François Delanoë, Julien Mioche, G. Adam de Villiers, Raphaël |
author_facet |
Jouan, Caroline Girard, Eric Pelon, Jacques Blanchet, Jean-Pierre Wobrock, W. Gultepe, I. Gayet, Jean-François Delanoë, Julien Mioche, G. Adam de Villiers, Raphaël |
author_sort |
Jouan, Caroline |
title |
Optically thin ice clouds in Arctic : Formation processes |
title_short |
Optically thin ice clouds in Arctic : Formation processes |
title_full |
Optically thin ice clouds in Arctic : Formation processes |
title_fullStr |
Optically thin ice clouds in Arctic : Formation processes |
title_full_unstemmed |
Optically thin ice clouds in Arctic : Formation processes |
title_sort |
optically thin ice clouds in arctic : formation processes |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-04115199 |
op_coverage |
San Francisco California, United States |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope polar night Alaska |
genre_facet |
Arctic north slope polar night Alaska |
op_source |
American Geophysical Union Fall Meeting 2010 https://hal.science/hal-04115199 American Geophysical Union Fall Meeting 2010, Dec 2010, San Francisco California, United States. pp.abstract id. A52B-07 |
op_relation |
hal-04115199 https://hal.science/hal-04115199 BIBCODE: 2010AGUFM.A52B.07J |
_version_ |
1772811829457715200 |