Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements
International audience During the international ASTAR experiment (Arctic Study of Aerosols, Clouds and Radiation) carried out from Longyearbyen (Spitsbergen) from 10 May to 11 June 2004, the AWI (Alfred Wegener Institute) Polar 2 aircraft was equipped with a unique combination of remote and in situ...
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ftccsdartic:oai:HAL:hal-00330138v1 2023-05-15T13:15:46+02:00 Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements Gayet, Jean-François Stachlewska, I. S. Jourdan, O. Shcherbakov, V. Schwarzenboeck, Alfons Neuber, R. Laboratoire de météorologie physique (LaMP) Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) 2007-07-30 https://hal.archives-ouvertes.fr/hal-00330138 https://hal.archives-ouvertes.fr/hal-00330138/document https://hal.archives-ouvertes.fr/hal-00330138/file/angeo-25-1487-2007.pdf en eng HAL CCSD European Geosciences Union hal-00330138 https://hal.archives-ouvertes.fr/hal-00330138 https://hal.archives-ouvertes.fr/hal-00330138/document https://hal.archives-ouvertes.fr/hal-00330138/file/angeo-25-1487-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00330138 Annales Geophysicae, European Geosciences Union, 2007, 25 (7), pp.1487-1497 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2021-10-24T20:41:42Z International audience During the international ASTAR experiment (Arctic Study of Aerosols, Clouds and Radiation) carried out from Longyearbyen (Spitsbergen) from 10 May to 11 June 2004, the AWI (Alfred Wegener Institute) Polar 2 aircraft was equipped with a unique combination of remote and in situ instruments. The airborne AMALi lidar provided downward backscatter and Depolarisation ratio profiles at 532 nm wavelength. The in situ instrumental setup comprised a Polar Nephelometer, a Cloud Particle Imager (CPI) as well as a Nevzorov and standard PMS probes to measure cloud particle properties in terms of scattering characteristics, particle morphology and size, and in-cloud partitioning of ice/water content. The objective of the paper is to present the results of a case study related to observations with ice crystals precipitating down to supercooled boundary-layer stratocumulus. The flight pattern was predefined in a way that firstly the AMALi lidar probed the cloud tops to guide the in situ measurements into a particular cloud formation. Three kinds of clouds with different microphysical and optical properties have therefore been quasi-simultaneously observed: (i) water droplets stratiform-layer, (ii) drizzle-drops fallstreak and (iii) precipitating ice-crystals from a cirrus cloud above. The signatures of these clouds are clearly evidenced from the in situ measurements and from the lidar profiles in term of backscatter and Depolarisation ratio. Accordingly, typical lidar ratios, i.e., extinction-to-backscatter ratios, are derived from the measured scattering phase function combined with subsequent particle shapes and size distributions. The backscatter profiles can therefore be retrieved under favourable conditions of low optical density. From these profiles extinction values in different cloud types can be obtained and compared with the direct in situ measurements. Article in Journal/Newspaper Alfred Wegener Institute Arctic Longyearbyen Spitsbergen Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Longyearbyen |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Gayet, Jean-François Stachlewska, I. S. Jourdan, O. Shcherbakov, V. Schwarzenboeck, Alfons Neuber, R. Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience During the international ASTAR experiment (Arctic Study of Aerosols, Clouds and Radiation) carried out from Longyearbyen (Spitsbergen) from 10 May to 11 June 2004, the AWI (Alfred Wegener Institute) Polar 2 aircraft was equipped with a unique combination of remote and in situ instruments. The airborne AMALi lidar provided downward backscatter and Depolarisation ratio profiles at 532 nm wavelength. The in situ instrumental setup comprised a Polar Nephelometer, a Cloud Particle Imager (CPI) as well as a Nevzorov and standard PMS probes to measure cloud particle properties in terms of scattering characteristics, particle morphology and size, and in-cloud partitioning of ice/water content. The objective of the paper is to present the results of a case study related to observations with ice crystals precipitating down to supercooled boundary-layer stratocumulus. The flight pattern was predefined in a way that firstly the AMALi lidar probed the cloud tops to guide the in situ measurements into a particular cloud formation. Three kinds of clouds with different microphysical and optical properties have therefore been quasi-simultaneously observed: (i) water droplets stratiform-layer, (ii) drizzle-drops fallstreak and (iii) precipitating ice-crystals from a cirrus cloud above. The signatures of these clouds are clearly evidenced from the in situ measurements and from the lidar profiles in term of backscatter and Depolarisation ratio. Accordingly, typical lidar ratios, i.e., extinction-to-backscatter ratios, are derived from the measured scattering phase function combined with subsequent particle shapes and size distributions. The backscatter profiles can therefore be retrieved under favourable conditions of low optical density. From these profiles extinction values in different cloud types can be obtained and compared with the direct in situ measurements. |
author2 |
Laboratoire de météorologie physique (LaMP) Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) |
format |
Article in Journal/Newspaper |
author |
Gayet, Jean-François Stachlewska, I. S. Jourdan, O. Shcherbakov, V. Schwarzenboeck, Alfons Neuber, R. |
author_facet |
Gayet, Jean-François Stachlewska, I. S. Jourdan, O. Shcherbakov, V. Schwarzenboeck, Alfons Neuber, R. |
author_sort |
Gayet, Jean-François |
title |
Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
title_short |
Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
title_full |
Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
title_fullStr |
Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
title_full_unstemmed |
Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
title_sort |
microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.archives-ouvertes.fr/hal-00330138 https://hal.archives-ouvertes.fr/hal-00330138/document https://hal.archives-ouvertes.fr/hal-00330138/file/angeo-25-1487-2007.pdf |
geographic |
Arctic Longyearbyen |
geographic_facet |
Arctic Longyearbyen |
genre |
Alfred Wegener Institute Arctic Longyearbyen Spitsbergen |
genre_facet |
Alfred Wegener Institute Arctic Longyearbyen Spitsbergen |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.archives-ouvertes.fr/hal-00330138 Annales Geophysicae, European Geosciences Union, 2007, 25 (7), pp.1487-1497 |
op_relation |
hal-00330138 https://hal.archives-ouvertes.fr/hal-00330138 https://hal.archives-ouvertes.fr/hal-00330138/document https://hal.archives-ouvertes.fr/hal-00330138/file/angeo-25-1487-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766270956720881664 |