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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ftinsu:oai:HAL:hal-04115199v1 2023-06-18T03:39:03+02:00 Optically thin ice clouds in Arctic : Formation processes Jouan, C. Girard, E. Pelon, J. Blanchet, J. Wobrock, W. Gultepe, I. Gayet, J. Delanoë, J. Mioche, G. Adam de Villiers, R. 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) 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) à renseigner, Unknown Region 2023-06-02 https://hal.science/hal-04115199 en eng HAL CCSD hal-04115199 https://hal.science/hal-04115199 BIBCODE: 2010AGUFM.A52B.07J American Geophysical Union https://hal.science/hal-04115199 American Geophysical Union, 0000, à renseigner, Unknown Region 0320 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud physics and chemistry 0394 ATMOSPHERIC COMPOSITION AND STRUCTURE / Instruments and techniques [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2023 ftinsu 2023-06-05T19:25:53Z 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 Institut national des sciences de l'Univers: HAL-INSU Arctic |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
0320 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud physics and chemistry 0394 ATMOSPHERIC COMPOSITION AND STRUCTURE / Instruments and techniques [SDU]Sciences of the Universe [physics] |
spellingShingle |
0320 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud physics and chemistry 0394 ATMOSPHERIC COMPOSITION AND STRUCTURE / Instruments and techniques [SDU]Sciences of the Universe [physics] Jouan, C. Girard, E. Pelon, J. Blanchet, J. Wobrock, W. Gultepe, I. Gayet, J. Delanoë, J. Mioche, G. Adam de Villiers, R. Optically thin ice clouds in Arctic : Formation processes |
topic_facet |
0320 ATMOSPHERIC COMPOSITION AND STRUCTURE / Cloud physics and chemistry 0394 ATMOSPHERIC COMPOSITION AND STRUCTURE / 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 |
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) 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) |
format |
Conference Object |
author |
Jouan, C. Girard, E. Pelon, J. Blanchet, J. Wobrock, W. Gultepe, I. Gayet, J. Delanoë, J. Mioche, G. Adam de Villiers, R. |
author_facet |
Jouan, C. Girard, E. Pelon, J. Blanchet, J. Wobrock, W. Gultepe, I. Gayet, J. Delanoë, J. Mioche, G. Adam de Villiers, R. |
author_sort |
Jouan, C. |
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 |
2023 |
url |
https://hal.science/hal-04115199 |
op_coverage |
à renseigner, Unknown Region |
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 https://hal.science/hal-04115199 American Geophysical Union, 0000, à renseigner, Unknown Region |
op_relation |
hal-04115199 https://hal.science/hal-04115199 BIBCODE: 2010AGUFM.A52B.07J |
_version_ |
1769003866234290176 |