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Validation of IIR/CALIPSO Level 1 Measurements by Comparison with Collocated Airborne Observations during CIRCLE-2 and Biscay ‘08 Campaigns

Sourdeval, Odran and Brogniez, Gerard and Pelon, Jacques and Labonnote, Laurent C. and Dubuisson, Philippe and Parol, Frédéric and Josset, Damien and Garnier, Anne and Faivre, Michael and Minikin, Andreas (2012) Validation of IIR/CALIPSO Level 1 Measurements by Comparison with Collocated Airborne Observations during CIRCLE-2 and Biscay ‘08 Campaigns. Journal of Atmospheric and Oceanic Technology, 29 (5), pp. 653-667. DOI: 10.1175/JTECH-D-11-00143.1.

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Official URL: http://journals.ametsoc.org/doi/pdf/10.1175/JTECH-D-11-00143.1

Abstract

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 Aèrosols 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-mm 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.

Document Type:Article
Title:Validation of IIR/CALIPSO Level 1 Measurements by Comparison with Collocated Airborne Observations during CIRCLE-2 and Biscay ‘08 Campaigns
Authors:
AuthorsInstitution or Email of Authors
Sourdeval, OdranUniv. de Lille, Villeneuve d’Ascq, F
Brogniez, GerardUniv. de Lille, Villeneuve d’Ascq, F
Pelon, JacquesUniv. Pierre et Marie Curie, Paris, F
Labonnote, Laurent C.Univ. de Lille, Villeneuve d’Ascq, F
Dubuisson, PhilippeUniv. de Lille, Villeneuve d’Ascq, F
Parol, FrédéricUniv. de Lille, Villeneuve d’Ascq, F
Josset, DamienUniv. Pierre et Marie Curie, Paris, F
Garnier, AnneUniv. Pierre et Marie Curie, Paris, F
Faivre, MichaelUniv. Pierre et Marie Curie, Paris, F
Minikin, AndreasDLR
Date:2012
Journal or Publication Title:Journal of Atmospheric and Oceanic Technology
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:29
DOI:10.1175/JTECH-D-11-00143.1
Page Range:pp. 653-667
Status:Published
Keywords:CALIPSO, CIRCLE-2
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:16 Jul 2012 15:58
Last Modified:12 Dec 2013 21:43

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