Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment
An important goal, within the context of improving climate change modelling, is to enhance our understanding of aerosols and their radiative effects (notably their indirect impact as cloud condensation nuclei). The cloud optical depth (COD) and average ice particle size of thin ice clouds (TICs) are...
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2011
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ftccsdartic:oai:HAL:tel-00753586v1 2023-05-15T14:49:56+02:00 Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment Analyse du potentiel de la radiométrie infrarouge thermique pour la caractérisation des nuages de glace en Arctique Blanchard, Yann space Université de Sherbrooke (UdeS)-Département de Géomatique appliquée Université de Sherbrooke (UdeS) Université of Sherbrooke Alain Royer et M. Norm O'Neill 2011-02-11 https://tel.archives-ouvertes.fr/tel-00753586 https://tel.archives-ouvertes.fr/tel-00753586/document https://tel.archives-ouvertes.fr/tel-00753586/file/Manuscrit_These_YannBlanchard.pdf fr fre HAL CCSD tel-00753586 https://tel.archives-ouvertes.fr/tel-00753586 https://tel.archives-ouvertes.fr/tel-00753586/document https://tel.archives-ouvertes.fr/tel-00753586/file/Manuscrit_These_YannBlanchard.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-00753586 Physique Atmosphérique et Océanique [physics.ao-ph]. Université of Sherbrooke, 2011. Français Remote sensing Ice clouds Thermal infrared multi-band radiometry Arctic Télédétection Nuages de glace Radiométrie infrarouge thermique Arctique [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/doctoralThesis Theses 2011 ftccsdartic 2021-02-14T01:13:04Z An important goal, within the context of improving climate change modelling, is to enhance our understanding of aerosols and their radiative effects (notably their indirect impact as cloud condensation nuclei). The cloud optical depth (COD) and average ice particle size of thin ice clouds (TICs) are two key parameters whose variations could strongly influence radiative effects and climate in the Arctic environment. Our objective was to assess the potential of using multi-band thermal radiance measurements of zenith sky radiance for retrieving COD and effective particle diameter (Deff) of TICs in the Arctic. We analyzed and quantified the sensitivity of thermal radiance on many parameters, such as COD, Deff, water vapor content, cloud bottom altitude and thickness, size distribution and shape. Using the sensitivity of IRT to COD and Deff, the developed retrieval technique is validated in comparison with retrievals from LIDAR and RADAR. Retrievals were applied to ground-based thermal infrared data acquired for 100 TICs at the high-Arctic PEARL observatory in Eureka, Nunavut, Canada and were validated using AHSRL LIDAR and MMCR RADAR data. The results of the retrieval method were used to successfully extract COD up to values of 3 and to separate TICs into two types : TIC1 characterized by small crystals (Deff< 30 microns) and TIC2 by large ice crystals (Deff> 30 microns, up to 300 microns). Inversions were performed across two polar winters. At the end of this research, we proposed different alternatives to apply our methodology in the Arctic. Dans le contexte actuel de changements climatiques, il est crucial d'approfondir nos connaissances des nuages de glace fins (TIC) et de leurs paramètres intensifs et extensifs. Les TICs peuvent avoir pour effet de refroidir ou de réchauffer le climat, en fonction de leurs paramètres météorologiques et microphysiques. Ainsi, l'épaisseur optique (COD) et la taille des particules sont essentiels pour pouvoir simuler les nuages de glace dans les modèles climatiques. ... Doctoral or Postdoctoral Thesis Arctic Arctique* Climate change Eureka Nunavut Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Canada Eureka ENVELOPE(-85.940,-85.940,79.990,79.990) Nunavut |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Remote sensing Ice clouds Thermal infrared multi-band radiometry Arctic Télédétection Nuages de glace Radiométrie infrarouge thermique Arctique [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Remote sensing Ice clouds Thermal infrared multi-band radiometry Arctic Télédétection Nuages de glace Radiométrie infrarouge thermique Arctique [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes Blanchard, Yann Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
topic_facet |
Remote sensing Ice clouds Thermal infrared multi-band radiometry Arctic Télédétection Nuages de glace Radiométrie infrarouge thermique Arctique [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDE.MCG]Environmental Sciences/Global Changes |
description |
An important goal, within the context of improving climate change modelling, is to enhance our understanding of aerosols and their radiative effects (notably their indirect impact as cloud condensation nuclei). The cloud optical depth (COD) and average ice particle size of thin ice clouds (TICs) are two key parameters whose variations could strongly influence radiative effects and climate in the Arctic environment. Our objective was to assess the potential of using multi-band thermal radiance measurements of zenith sky radiance for retrieving COD and effective particle diameter (Deff) of TICs in the Arctic. We analyzed and quantified the sensitivity of thermal radiance on many parameters, such as COD, Deff, water vapor content, cloud bottom altitude and thickness, size distribution and shape. Using the sensitivity of IRT to COD and Deff, the developed retrieval technique is validated in comparison with retrievals from LIDAR and RADAR. Retrievals were applied to ground-based thermal infrared data acquired for 100 TICs at the high-Arctic PEARL observatory in Eureka, Nunavut, Canada and were validated using AHSRL LIDAR and MMCR RADAR data. The results of the retrieval method were used to successfully extract COD up to values of 3 and to separate TICs into two types : TIC1 characterized by small crystals (Deff< 30 microns) and TIC2 by large ice crystals (Deff> 30 microns, up to 300 microns). Inversions were performed across two polar winters. At the end of this research, we proposed different alternatives to apply our methodology in the Arctic. Dans le contexte actuel de changements climatiques, il est crucial d'approfondir nos connaissances des nuages de glace fins (TIC) et de leurs paramètres intensifs et extensifs. Les TICs peuvent avoir pour effet de refroidir ou de réchauffer le climat, en fonction de leurs paramètres météorologiques et microphysiques. Ainsi, l'épaisseur optique (COD) et la taille des particules sont essentiels pour pouvoir simuler les nuages de glace dans les modèles climatiques. ... |
author2 |
space Université de Sherbrooke (UdeS)-Département de Géomatique appliquée Université de Sherbrooke (UdeS) Université of Sherbrooke Alain Royer et M. Norm O'Neill |
format |
Doctoral or Postdoctoral Thesis |
author |
Blanchard, Yann |
author_facet |
Blanchard, Yann |
author_sort |
Blanchard, Yann |
title |
Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
title_short |
Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
title_full |
Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
title_fullStr |
Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
title_full_unstemmed |
Analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
title_sort |
analysis of the potential for retrieving cloud optical depth and particle size of thin ice clouds using infrared thermal radiometry in an arctic environment |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://tel.archives-ouvertes.fr/tel-00753586 https://tel.archives-ouvertes.fr/tel-00753586/document https://tel.archives-ouvertes.fr/tel-00753586/file/Manuscrit_These_YannBlanchard.pdf |
long_lat |
ENVELOPE(-85.940,-85.940,79.990,79.990) |
geographic |
Arctic Canada Eureka Nunavut |
geographic_facet |
Arctic Canada Eureka Nunavut |
genre |
Arctic Arctique* Climate change Eureka Nunavut |
genre_facet |
Arctic Arctique* Climate change Eureka Nunavut |
op_source |
https://tel.archives-ouvertes.fr/tel-00753586 Physique Atmosphérique et Océanique [physics.ao-ph]. Université of Sherbrooke, 2011. Français |
op_relation |
tel-00753586 https://tel.archives-ouvertes.fr/tel-00753586 https://tel.archives-ouvertes.fr/tel-00753586/document https://tel.archives-ouvertes.fr/tel-00753586/file/Manuscrit_These_YannBlanchard.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766321002665476096 |