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Laboratoire d'études en Géophysique et océanographie spatiales |  |
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Laboratoire d'études en Géophysique et océanographie spatiales | |
| HAL: hal-00429435, version 1 |
| DOI: 10.1029/2005WR004331 |
| Detailed view |  Export this paper |
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| Water Resources Research 42 (2006) W10403 |
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| Time-variations of the regional evapotranspiration rate from GRACE satellite gravimetry |
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| Guillaume Ramillien 1Frédéric Frappart 1, 2 |
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| (2006-10-04) |
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| Since its launch in March 2002, the GRACE mission is measuring the global time variations of the Earth's gravity field with a current resolution of ~500 km. Especially over the continents, these measurements represent the integrated land water mass including surface waters (lakes, wetlands and rivers), soil moisture, groundwater and snow cover. In this study, we use the GRACE land water solutions computed by Ramillien et al. (2005a) through an iterative inversion of monthly geoids from April 2002 to May 2004, to estimate time-series of basin-scale regional evapotranspiration rate -and associated uncertainties-. Evapotranspiration is determined by integrating and solving the water mass balance equation, which relates land water storage (from GRACE), precipitation data (from the Global Precipitation Climatology Centre), runoff (from a global land surface model) and evapotranspiration (the unknown). We further examine the sensibility of the computation when using different model runoff. Evapotranspiration results are compared to outputs of four different global land surface models. The overall satisfactory agreement between GRACE-derived and model-based evapotranspiration prove the ability of GRACE to provide realistic estimates of this parameter. |
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| 1: | Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
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CNRS : UMR5566 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III |
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| 2: | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
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CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
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| 3: | GeoForschungsZentrum (GFZ) |
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GeoForschungsZentrum |
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| 4: | 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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| Subject | : | Sciences of the Universe/Earth Sciences |
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| hal-00429435, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00429435 | |
| oai:hal.archives-ouvertes.fr:hal-00429435 | |
| From: Frédéric Frappart | |
| Submitted on: Monday, 2 November 2009 19:06:32 | |
| Updated on: Wednesday, 4 November 2009 15:59:52 | |
