Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds
This study is part of the validation projects of CALIPSO and CloudSat satellites which are devoted to the observation of clouds in the A-Train constellation, in order to improve clouds parameterisations in climate forecasting models. Our work is based on in situ airborne measurements (PMS, Polar Nep...
Main Author: | |
---|---|
Other Authors: | , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
Published: |
HAL CCSD
2010
|
Subjects: | |
Online Access: | https://theses.hal.science/tel-00719316 https://theses.hal.science/tel-00719316v1/document https://theses.hal.science/tel-00719316v1/file/2010CLF22026.pdf |
id |
ftinsu:oai:HAL:tel-00719316v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:tel-00719316v1 2024-10-13T14:05:24+00:00 Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds Validation des produits d'inversion des observations satellitaires CALIPSO/CloudSat pour la caractérisation des propriétés optiques et microphysiques des nuages de glace et en phase mixte Mioche, Guillaume 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) Université Blaise Pascal - Clermont-Ferrand II Jean-François Gayet 2010-03-30 https://theses.hal.science/tel-00719316 https://theses.hal.science/tel-00719316v1/document https://theses.hal.science/tel-00719316v1/file/2010CLF22026.pdf fr fre HAL CCSD NNT: 2010CLF22026 info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00719316 Océan, Atmosphère. Université Blaise Pascal - Clermont-Ferrand II, 2010. Français. ⟨NNT : 2010CLF22026⟩ CALIPSO validation CloudSat validation mixed phase Arctic clouds optical and microphysical properties parameterisations orientation effect in situ measurement validation CALIPSO validation CloudSat cirrus nuages Arctiques en phase mixte propriétés optiques et microphysiques paramétrisations effet d'orientation mesures in situ CPI [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2010 ftinsu 2024-09-26T15:02:33Z This study is part of the validation projects of CALIPSO and CloudSat satellites which are devoted to the observation of clouds in the A-Train constellation, in order to improve clouds parameterisations in climate forecasting models. Our work is based on in situ airborne measurements (PMS, Polar Nephelometer, CPI) of microphysical and optical properties of clouds. Several field campaigns have been made in Arctic region (ASTAR 2007 and POLARCAT), and in mid-latitude cirrus (CIRCLE-2) during which in situ observations have been collocated with satellites observations. CPI data processing has been improved for the determination of microphysical properties and for the calculation of a radar reflectivity factor (Z). Concerning CALIPSO validation, two cirrus situations show a good agreement between in situ and retrieval extinction coefficients (σ), and so validate the hypothesis made in the lidar retrieval method. In another situation, orientation effect of ice crystal with planar shape leads to specular reflexions of the laser beam and consequently to an overestimation of σ retrievals. On the contrary, larger in situ values of σ are observed during a situation where large ice crystals are present. Shattering effects of these crystals could generate small particles inducing an overestimation of in situ σ. Concerning CloudSat validation, the results show a good agreement between ZCloudSat et ZCPI. However, cloud products retrievals are widely overestimate in particular in mixed phase clouds where the retrieval scheme based on temperature seems to give bad values. Cette thèse s'inscrit dans les projets de validation des satellites CALIPSO et CloudSat de L'A-Train dédiés à l'étude des nuages, afin d'améliorer leur représentation dans les modèles de prévision du climat. La validation a consisté à mesurer les paramètres microphysiques et optiques des nuages au moyen d'instruments in situ aéroportés (PMS, Néphélomètre Polaire,CPI). Plusieurs campagnes ont été réalisées en région Arctique (ASTAR 2007 et POLARCAt) et en ... Doctoral or Postdoctoral Thesis Arctic Arctique* 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 |
French |
topic |
CALIPSO validation CloudSat validation mixed phase Arctic clouds optical and microphysical properties parameterisations orientation effect in situ measurement validation CALIPSO validation CloudSat cirrus nuages Arctiques en phase mixte propriétés optiques et microphysiques paramétrisations effet d'orientation mesures in situ CPI [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
CALIPSO validation CloudSat validation mixed phase Arctic clouds optical and microphysical properties parameterisations orientation effect in situ measurement validation CALIPSO validation CloudSat cirrus nuages Arctiques en phase mixte propriétés optiques et microphysiques paramétrisations effet d'orientation mesures in situ CPI [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Mioche, Guillaume Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
topic_facet |
CALIPSO validation CloudSat validation mixed phase Arctic clouds optical and microphysical properties parameterisations orientation effect in situ measurement validation CALIPSO validation CloudSat cirrus nuages Arctiques en phase mixte propriétés optiques et microphysiques paramétrisations effet d'orientation mesures in situ CPI [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
This study is part of the validation projects of CALIPSO and CloudSat satellites which are devoted to the observation of clouds in the A-Train constellation, in order to improve clouds parameterisations in climate forecasting models. Our work is based on in situ airborne measurements (PMS, Polar Nephelometer, CPI) of microphysical and optical properties of clouds. Several field campaigns have been made in Arctic region (ASTAR 2007 and POLARCAT), and in mid-latitude cirrus (CIRCLE-2) during which in situ observations have been collocated with satellites observations. CPI data processing has been improved for the determination of microphysical properties and for the calculation of a radar reflectivity factor (Z). Concerning CALIPSO validation, two cirrus situations show a good agreement between in situ and retrieval extinction coefficients (σ), and so validate the hypothesis made in the lidar retrieval method. In another situation, orientation effect of ice crystal with planar shape leads to specular reflexions of the laser beam and consequently to an overestimation of σ retrievals. On the contrary, larger in situ values of σ are observed during a situation where large ice crystals are present. Shattering effects of these crystals could generate small particles inducing an overestimation of in situ σ. Concerning CloudSat validation, the results show a good agreement between ZCloudSat et ZCPI. However, cloud products retrievals are widely overestimate in particular in mixed phase clouds where the retrieval scheme based on temperature seems to give bad values. Cette thèse s'inscrit dans les projets de validation des satellites CALIPSO et CloudSat de L'A-Train dédiés à l'étude des nuages, afin d'améliorer leur représentation dans les modèles de prévision du climat. La validation a consisté à mesurer les paramètres microphysiques et optiques des nuages au moyen d'instruments in situ aéroportés (PMS, Néphélomètre Polaire,CPI). Plusieurs campagnes ont été réalisées en région Arctique (ASTAR 2007 et POLARCAt) et en ... |
author2 |
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) Université Blaise Pascal - Clermont-Ferrand II Jean-François Gayet |
format |
Doctoral or Postdoctoral Thesis |
author |
Mioche, Guillaume |
author_facet |
Mioche, Guillaume |
author_sort |
Mioche, Guillaume |
title |
Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
title_short |
Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
title_full |
Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
title_fullStr |
Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
title_full_unstemmed |
Validation of CALIPSO/CloudSat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
title_sort |
validation of calipso/cloudsat cloud retrieval products for the characterisation of optical and microphysical properties of iced and mixed phase clouds |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://theses.hal.science/tel-00719316 https://theses.hal.science/tel-00719316v1/document https://theses.hal.science/tel-00719316v1/file/2010CLF22026.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctique* |
genre_facet |
Arctic Arctique* |
op_source |
https://theses.hal.science/tel-00719316 Océan, Atmosphère. Université Blaise Pascal - Clermont-Ferrand II, 2010. Français. ⟨NNT : 2010CLF22026⟩ |
op_relation |
NNT: 2010CLF22026 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1812811500652331008 |