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Laboratoire d'aérologie |  |
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Laboratoire d'aérologie | |
| HAL : hal-00326172, version 1 |
| DOI : 10.1029/2007JD008673 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Geophysical Research Atmospheres 113, D08111 (2008) - |
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| Development of precipitation retrievals at millimeter and sub-millimeter wavelenghts for geostationaly satellites. |
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| E. Defer 1C. Prigent 1 |
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| (2008) |
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| We study the potential of millimeter and sub-millimeter wavelengths for precipitation retrieval from geostationary sensors based on mesoscale cloud modeling and radiative transfer computation. Hydrometeor profiles simulated with the Meso-NH cloud resolving model for five European midlatitude situations are used to compute the brightness temperatures at frequencies from 23.8 to 875 GHz with the Atmospheric Transmission at Microwaves (ATM). Performances of both rain detection and rain rate retrieval are analyzed for different frequency sets, over ocean and land separately, and compared to the user requirements. The performances of a frequency set such as that already planned for geostationary satellites (with channels in the O2 lines at 50, 118, and 424 GHz, and in the H2O lines at 183, 325, 380 GHz) satisfy the requirements for Numerical Weather Prediction and NoWCasting in terms of rain detection as well as for rain rate retrieval above 1 mm/h. Suppressing the 50 GHz O2 channels does not seriously degrade the performances, except for rain rate below 1 mm/h, and, in addition, limits the spatial resolution problem from a geostationary orbit. Adding the thermal infrared observations has a limited impact. The retrieval of other hydrometeor quantities (cloud, ice) is also tested as well as the possibility to retrieve rain and the other hydrometeor profiles. These theoretical results are evaluated at close-to-millimeter wavelengths with coincident AMSU-B and radar observations (BALTEX and CAMRa). The results are degraded with respect to the theory, as expected, but are consistent with the observations. |
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| 1 : | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA) |
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CNRS : UMR8112 – INSU – Observatoire de Paris – Université Pierre et Marie Curie [UPMC] - Paris VI – Université de Cergy Pontoise – Ecole normale supérieure de Paris - ENS Paris |
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| 2 : | Laboratoire de Météorologie Dynamique (LMD) |
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CNRS : UMR8539 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI – Polytechnique - X – Ecole normale supérieure de Paris - ENS Paris |
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| 3 : | Instituto de Estructura de la Materia (IEM) |
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Consejo Superior de Investigaciones Cientificas |
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| 4 : | Rutherford Appleton Laboratory |
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Space Science and Technology Department |
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| 5 : | Collecte Localisation Satellite |
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PRES Université de Toulouse |
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| 6 : | Laboratoire d'aérologie (LA) |
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CNRS : UMR5560 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| Domaine | : | Physique/Physique/Physique Atmosphérique et Océanique |
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| Rain retrieval – passive radiometry – algorithms. |
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| hal-00326172, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00326172 | |
| oai:hal.archives-ouvertes.fr:hal-00326172 | |
| Contributeur : Maria-Isabel Ledig | |
| Soumis le : Jeudi 2 Octobre 2008, 09:38:15 | |
| Dernière modification le : Jeudi 3 Février 2011, 10:18:50 | |
