Cirrus Horizontal Heterogeneity and 3‐D ...
Type de document :
Article dans une revue scientifique: Article original
DOI :
URL permanente :
Titre :
Cirrus Horizontal Heterogeneity and 3‐D Radiative Effects on Cloud Optical Property Retrievals From MODIS Near to Thermal Infrared Channels as a Function of Spatial Resolution
Auteur(s) :
Fauchez, T. [Auteur]
Platnick, S. [Auteur]
Sourdeval, Odran [Auteur]
Leipziger Institut für Meteorologie [LIM]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Wang, C. [Auteur]
Meyer, K. [Auteur]
Cornet, Celine [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Szczap, F. [Auteur]
Laboratoire de Météorologie Physique [LaMP]
Platnick, S. [Auteur]
Sourdeval, Odran [Auteur]
Leipziger Institut für Meteorologie [LIM]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Wang, C. [Auteur]
Meyer, K. [Auteur]
Cornet, Celine [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Szczap, F. [Auteur]
Laboratoire de Météorologie Physique [LaMP]
Titre de la revue :
Journal of Geophysical Research: Atmospheres
Numéro :
123
Pagination :
11,141-11,153
Éditeur :
American Geophysical Union (AGU)
Date de publication :
2018-10-16
ISSN :
2169-897X
Mot(s)-clé(s) en anglais :
cirrus
optimal estimation
optical property
cloud heterogeneity
3-D radiative effects
optimal estimation
optical property
cloud heterogeneity
3-D radiative effects
Discipline(s) HAL :
Planète et Univers [physics]/Océan, Atmosphère
Résumé en anglais : [en]
To retrieve cloud optical properties, current satellite operational imager algorithms simplify the forward radiative transfer problem by assuming that cloudy pixels are horizontally homogeneous and radiatively independent. ...
Lire la suite >To retrieve cloud optical properties, current satellite operational imager algorithms simplify the forward radiative transfer problem by assuming that cloudy pixels are horizontally homogeneous and radiatively independent. This study investigates the effects of cirrus horizontal heterogeneity and 3-D radiative effects on cloud optical thickness (COT) and ice crystal effective radius (CER) retrievals obtained using simulated nadir near-infrared/shortwave-infrared (NIR/SWIR) reflectances at 0.86 and 2.13 μm and thermal infrared (TIR) radiances at 8.5, 11.0, and 12.0 μm, first separately and next using the five wavelengths together. Synthetic cirrus radiation fields are generated using a cirrus 3-D cloud generator and a 3-D radiative transfer code. When both cloud 3-D and heterogeneity effects are considered, the solar reflectance-based retrievals have the largest errors (up to 10% for COT and 80% for CER, depending on solar angles) for spatial resolutions less than 500–1,000 m, while the TIR-based retrievals have the largest errors (up to 30% for COT and 50% for CER) above this resolution due to parallel homogeneous approximation bias. Therefore, TIR radiance-based retrievals are preferable for spatial resolutions equal or higher than ~500 m to 1 km, while NIR/SWIR reflectance-based retrievals are preferable for coarser spatial resolutions. The combination of NIR/SWIR and TIR measurements performed better together than individually for CER retrieval only for resolutions coarser than 2.5 km because 3-D effects are negligible at this scale. Thus, the spectral dependence of subpixel cloud horizontal heterogeneity and 3-D radiative effects has strong consequences when simultaneously using different channels for retrieving cirrus properties.Lire moins >
Lire la suite >To retrieve cloud optical properties, current satellite operational imager algorithms simplify the forward radiative transfer problem by assuming that cloudy pixels are horizontally homogeneous and radiatively independent. This study investigates the effects of cirrus horizontal heterogeneity and 3-D radiative effects on cloud optical thickness (COT) and ice crystal effective radius (CER) retrievals obtained using simulated nadir near-infrared/shortwave-infrared (NIR/SWIR) reflectances at 0.86 and 2.13 μm and thermal infrared (TIR) radiances at 8.5, 11.0, and 12.0 μm, first separately and next using the five wavelengths together. Synthetic cirrus radiation fields are generated using a cirrus 3-D cloud generator and a 3-D radiative transfer code. When both cloud 3-D and heterogeneity effects are considered, the solar reflectance-based retrievals have the largest errors (up to 10% for COT and 80% for CER, depending on solar angles) for spatial resolutions less than 500–1,000 m, while the TIR-based retrievals have the largest errors (up to 30% for COT and 50% for CER) above this resolution due to parallel homogeneous approximation bias. Therefore, TIR radiance-based retrievals are preferable for spatial resolutions equal or higher than ~500 m to 1 km, while NIR/SWIR reflectance-based retrievals are preferable for coarser spatial resolutions. The combination of NIR/SWIR and TIR measurements performed better together than individually for CER retrieval only for resolutions coarser than 2.5 km because 3-D effects are negligible at this scale. Thus, the spectral dependence of subpixel cloud horizontal heterogeneity and 3-D radiative effects has strong consequences when simultaneously using different channels for retrieving cirrus properties.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Équipe(s) de recherche :
Interactions Rayonnement Nuages (IRN)
Date de dépôt :
2023-01-06T12:42:34Z
2023-01-13T14:06:21Z
2023-01-13T14:06:21Z
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- Fauchez-2018aa.pdf
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