Using CALIOP to estimate cloud-field base ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Using CALIOP to estimate cloud-field base height and its uncertainty: the Cloud Base Altitude Spatial Extrapolator (CBASE) algorithm and dataset
Auteur(s) :
Mülmenstädt, Johannes [Auteur]
Leipziger Institut für Meteorologie [LIM]
Sourdeval, Odran [Auteur]
Leipziger Institut für Meteorologie [LIM]
Henderson, David S. [Auteur]
University of Wisconsin-Madison
L'Ecuyer, Tristan S. [Auteur]
University of Wisconsin-Madison
Unglaub, Claudia [Auteur]
Leipziger Institut für Meteorologie [LIM]
Jungandreas, Leonore [Auteur]
Leipziger Institut für Meteorologie [LIM]
Böhm, Christoph [Auteur]
Institut für Geophysik und Meteorologie [Köln] [IGN]
Russell, Lynn M. [Auteur]
The Scripps Research Institute [La Jolla, San Diego]
Quaas, Johannes [Auteur]
Leipziger Institut für Meteorologie [LIM]
Leipziger Institut für Meteorologie [LIM]
Sourdeval, Odran [Auteur]
Leipziger Institut für Meteorologie [LIM]
Henderson, David S. [Auteur]
University of Wisconsin-Madison
L'Ecuyer, Tristan S. [Auteur]
University of Wisconsin-Madison
Unglaub, Claudia [Auteur]
Leipziger Institut für Meteorologie [LIM]
Jungandreas, Leonore [Auteur]
Leipziger Institut für Meteorologie [LIM]
Böhm, Christoph [Auteur]
Institut für Geophysik und Meteorologie [Köln] [IGN]
Russell, Lynn M. [Auteur]
The Scripps Research Institute [La Jolla, San Diego]
Quaas, Johannes [Auteur]
Leipziger Institut für Meteorologie [LIM]
Titre de la revue :
Earth System Science Data
Nom court de la revue :
Earth Syst. Sci. Data
Numéro :
10
Pagination :
2279-2293
Éditeur :
Copernicus GmbH
Date de publication :
2018-12-14
ISSN :
1866-3516
Discipline(s) HAL :
Planète et Univers [physics]/Océan, Atmosphère
Résumé en anglais : [en]
A technique is presented that uses attenuated backscatter profiles from the
CALIOP satellite lidar to estimate cloud base heights of lower-troposphere
liquid clouds (cloud base height below approximately 3 km). Even when ...
Lire la suite >A technique is presented that uses attenuated backscatter profiles from the CALIOP satellite lidar to estimate cloud base heights of lower-troposphere liquid clouds (cloud base height below approximately 3 km). Even when clouds are thick enough to attenuate the lidar beam (optical thickness τ≳5), the technique provides cloud base heights by treating the cloud base height of nearby thinner clouds as representative of the surrounding cloud field. Using ground-based ceilometer data, uncertainty estimates for the cloud base height product at retrieval resolution are derived as a function of various properties of the CALIOP lidar profiles. Evaluation of the predicted cloud base heights and their predicted uncertainty using a second statistically independent ceilometer dataset shows that cloud base heights and uncertainties are biased by less than 10 %. Geographic distributions of cloud base height and its uncertainty are presented. In some regions, the uncertainty is found to be substantially smaller than the 480 m uncertainty assumed in the A-Train surface downwelling longwave estimate, potentially permitting the most uncertain of the radiative fluxes in the climate system to be better constrained. The cloud base dataset is available at https://doi.org/10.1594/WDCC/CBASE.Lire moins >
Lire la suite >A technique is presented that uses attenuated backscatter profiles from the CALIOP satellite lidar to estimate cloud base heights of lower-troposphere liquid clouds (cloud base height below approximately 3 km). Even when clouds are thick enough to attenuate the lidar beam (optical thickness τ≳5), the technique provides cloud base heights by treating the cloud base height of nearby thinner clouds as representative of the surrounding cloud field. Using ground-based ceilometer data, uncertainty estimates for the cloud base height product at retrieval resolution are derived as a function of various properties of the CALIOP lidar profiles. Evaluation of the predicted cloud base heights and their predicted uncertainty using a second statistically independent ceilometer dataset shows that cloud base heights and uncertainties are biased by less than 10 %. Geographic distributions of cloud base height and its uncertainty are presented. In some regions, the uncertainty is found to be substantially smaller than the 480 m uncertainty assumed in the A-Train surface downwelling longwave estimate, potentially permitting the most uncertain of the radiative fluxes in the climate system to be better constrained. The cloud base dataset is available at https://doi.org/10.1594/WDCC/CBASE.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Projet Européen :
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Date de dépôt :
2023-01-06T12:53:26Z
2023-01-11T09:32:29Z
2023-01-11T09:32:29Z
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- Muelmenstaedt-2018aa.pdf
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