CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007
International audience Ground-based and satellite observations have hinted at the existence of polar stratospheric clouds (PSCs) with relatively high optical depths, even if optical depth values are hard to come by. This study documents a type II PSC observed from spaceborne lidar, with visible opti...
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ftepunivpsaclay:oai:HAL:hal-00439693v1 2024-06-09T07:40:56+00:00 CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 Noel, Vincent Hertzog, Albert Chepfer, Hélène Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Institut Pierre-Simon-Laplace (IPSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) 2009-03-03 https://hal.science/hal-00439693 https://hal.science/hal-00439693/document https://hal.science/hal-00439693/file/Opt_Thick_PSC_7.pdf en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/arxiv/0912.1481 hal-00439693 https://hal.science/hal-00439693 https://hal.science/hal-00439693/document https://hal.science/hal-00439693/file/Opt_Thick_PSC_7.pdf ARXIV: 0912.1481 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00439693 Journal of Geophysical Research, 2009, 114, pp.D05202 CALIPSO PSC Antarctica [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/article Journal articles 2009 ftepunivpsaclay 2024-05-16T11:46:15Z International audience Ground-based and satellite observations have hinted at the existence of polar stratospheric clouds (PSCs) with relatively high optical depths, even if optical depth values are hard to come by. This study documents a type II PSC observed from spaceborne lidar, with visible optical depths up to 0.8. Comparisons with multiple temperature fields, including reanalyses and results from mesoscale simulations, suggest that intense small-scale temperature fluctuations due to gravity waves play an important role in its formation, while nearby observations show the presence of a potentially related type Ia PSC farther downstream inside the polar vortex. Following this first case, the geographic distribution and microphysical properties of PSCs with optical depths above 0.3 are explored over Antarctica during the 2006 and 2007 austral winters. These clouds are rare (less than 1% of profiles) and concentrated over areas where strong winds hit steep ground slopes in the Western Hemisphere, especially over the peninsula. Such PSCs are colder than the general PSC population, and their detection is correlated with daily temperature minima across Antarctica. Lidar and depolarization ratios within these clouds suggest they are most likely ice-based (type II). Similarities between the case study and other PSCs suggest they might share the same formation mechanisms. Article in Journal/Newspaper Antarc* Antarctica École Polytechnique, Université Paris-Saclay: HAL Austral |
institution |
Open Polar |
collection |
École Polytechnique, Université Paris-Saclay: HAL |
op_collection_id |
ftepunivpsaclay |
language |
English |
topic |
CALIPSO PSC Antarctica [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
CALIPSO PSC Antarctica [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Noel, Vincent Hertzog, Albert Chepfer, Hélène CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 |
topic_facet |
CALIPSO PSC Antarctica [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience Ground-based and satellite observations have hinted at the existence of polar stratospheric clouds (PSCs) with relatively high optical depths, even if optical depth values are hard to come by. This study documents a type II PSC observed from spaceborne lidar, with visible optical depths up to 0.8. Comparisons with multiple temperature fields, including reanalyses and results from mesoscale simulations, suggest that intense small-scale temperature fluctuations due to gravity waves play an important role in its formation, while nearby observations show the presence of a potentially related type Ia PSC farther downstream inside the polar vortex. Following this first case, the geographic distribution and microphysical properties of PSCs with optical depths above 0.3 are explored over Antarctica during the 2006 and 2007 austral winters. These clouds are rare (less than 1% of profiles) and concentrated over areas where strong winds hit steep ground slopes in the Western Hemisphere, especially over the peninsula. Such PSCs are colder than the general PSC population, and their detection is correlated with daily temperature minima across Antarctica. Lidar and depolarization ratios within these clouds suggest they are most likely ice-based (type II). Similarities between the case study and other PSCs suggest they might share the same formation mechanisms. |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Institut Pierre-Simon-Laplace (IPSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Noel, Vincent Hertzog, Albert Chepfer, Hélène |
author_facet |
Noel, Vincent Hertzog, Albert Chepfer, Hélène |
author_sort |
Noel, Vincent |
title |
CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 |
title_short |
CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 |
title_full |
CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 |
title_fullStr |
CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 |
title_full_unstemmed |
CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 |
title_sort |
calipso observations of wave-induced pscs with near-unity optical depth over antarctica in 2006-2007 |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-00439693 https://hal.science/hal-00439693/document https://hal.science/hal-00439693/file/Opt_Thick_PSC_7.pdf |
geographic |
Austral |
geographic_facet |
Austral |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00439693 Journal of Geophysical Research, 2009, 114, pp.D05202 |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/0912.1481 hal-00439693 https://hal.science/hal-00439693 https://hal.science/hal-00439693/document https://hal.science/hal-00439693/file/Opt_Thick_PSC_7.pdf ARXIV: 0912.1481 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1801369334400942080 |