Validation of IIR/CALIPSO Level 1 Measurements ...
Document type :
Article dans une revue scientifique: Article original
Permalink :
Title :
Validation of IIR/CALIPSO Level 1 Measurements by Comparison with Collocated Airborne Observations during CIRCLE-2 and Biscay ‘08 Campaigns
Author(s) :
Sourdeval, Odran [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Brogniez, Gerard [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Pelon, Jacques [Auteur]
Couillard Labonnotte, Laurent [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Dubuisson, Philippe [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Parol, Frederic [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Josset, Damien [Auteur]
Garnier, Anne [Auteur]
Faivre, Michaël [Auteur]
Minikin, Andreas [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Brogniez, Gerard [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Pelon, Jacques [Auteur]
Couillard Labonnotte, Laurent [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Dubuisson, Philippe [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Parol, Frederic [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Josset, Damien [Auteur]
Garnier, Anne [Auteur]
Faivre, Michaël [Auteur]
Minikin, Andreas [Auteur]
Journal title :
Journal of Atmospheric and Oceanic Technology
Volume number :
29
Pages :
653-667
Publisher :
American Meteorological Society
Publication date :
2012-05-01
ISSN :
0739-0572
English keyword(s) :
Cirrus clouds
Cloud radiative effects
Infrared radiation
Aircraft observations
Lidars/Lidar observations
Satellite observations
Cloud radiative effects
Infrared radiation
Aircraft observations
Lidars/Lidar observations
Satellite observations
HAL domain(s) :
Planète et Univers [physics]/Océan, Atmosphère
Physique [physics]/Physique [physics]/Physique Atmosphérique et Océanique [physics.ao-ph]
Physique [physics]/Physique [physics]/Physique Atmosphérique et Océanique [physics.ao-ph]
English abstract : [en]
In the frame of validation of the spatial observations from the radiometer IIR on board CALIPSO, the two airborne campaigns Cirrus Cloud Experiment (CIRCLE)-2 and Biscay ‘08 took place in 2007 and 2008 in the western part ...
Show more >In the frame of validation of the spatial observations from the radiometer IIR on board CALIPSO, the two airborne campaigns Cirrus Cloud Experiment (CIRCLE)-2 and Biscay ‘08 took place in 2007 and 2008 in the western part of France, over the Atlantic Ocean. During these experiments, remote sensing measurements were made over cirrus clouds, right under the track of Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) in space and time collocation. For this purpose, a Falcon-20 aircraft was equipped with the Lidar pour l’Etude des Interactions Aérosols Nuages Dynamique Rayonnement et du Cycle de l’Eau (LEANDRE)-New Generation (NG) and the thermal infrared radiometer Conveyable Low-Noise Infrared Radiometer for Measurements of Atmosphere and Ground Surface Targets (CLIMAT)-Airborne Version (AV), whose spectral characteristics are strongly similar to those of the infrared imaging radiometer (IIR). In situ measurements were also taken in cirrus clouds during CIRCLE-2. After comparisons, consistent agreements are found between brightness temperatures measured by CLIMAT-AV and IIR. However, deviations in the brightness temperature measurements are still observed, mainly in the 8.6-μm channels. Simulations using a radiative transfer code are performed along a perfectly clear-sky area to show that these dissimilarities are inherent in slight differences between the spectral channels of both radiometers, and in differences between their altitudes. Cloudy and imperfectly clear areas are found to be harder to interpret, but the measurements are still coherent by taking into account experimental uncertainties. In the end, IIR measurements can be validated unambiguously.Show less >
Show more >In the frame of validation of the spatial observations from the radiometer IIR on board CALIPSO, the two airborne campaigns Cirrus Cloud Experiment (CIRCLE)-2 and Biscay ‘08 took place in 2007 and 2008 in the western part of France, over the Atlantic Ocean. During these experiments, remote sensing measurements were made over cirrus clouds, right under the track of Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) in space and time collocation. For this purpose, a Falcon-20 aircraft was equipped with the Lidar pour l’Etude des Interactions Aérosols Nuages Dynamique Rayonnement et du Cycle de l’Eau (LEANDRE)-New Generation (NG) and the thermal infrared radiometer Conveyable Low-Noise Infrared Radiometer for Measurements of Atmosphere and Ground Surface Targets (CLIMAT)-Airborne Version (AV), whose spectral characteristics are strongly similar to those of the infrared imaging radiometer (IIR). In situ measurements were also taken in cirrus clouds during CIRCLE-2. After comparisons, consistent agreements are found between brightness temperatures measured by CLIMAT-AV and IIR. However, deviations in the brightness temperature measurements are still observed, mainly in the 8.6-μm channels. Simulations using a radiative transfer code are performed along a perfectly clear-sky area to show that these dissimilarities are inherent in slight differences between the spectral channels of both radiometers, and in differences between their altitudes. Cloudy and imperfectly clear areas are found to be harder to interpret, but the measurements are still coherent by taking into account experimental uncertainties. In the end, IIR measurements can be validated unambiguously.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Research team(s) :
Interactions Rayonnement Nuages (IRN)
Submission date :
2023-01-06T14:24:42Z
2023-01-13T14:47:37Z
2023-01-13T14:47:37Z
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