| Publication type: |
 |
Article in peer-reviewed journal |
|
| Subject: |
|
Sciences of the Universe/Earth Sciences
|
|
| Title: |
|
Time-variations of the regional evapotranspiration rate from GRACE satellite gravimetry |
|
| Author(s): |
|
Guillaume Ramillien 1, Frédéric Frappart ( ) 1, 2, Andreas Güntner 3, Thanh Ngo-Duc () 4, Anny Cazenave 1, Katia Laval 4 |
|
| Laboratory: |
|
|
|
| Abstract: |
|
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. |
|
| Fulltext language: |
|
English |
|
| Production date: |
|
2005-06-09 |
|
|
| Journal: |
|
| Water Resources Research |
| Publisher |
American Geophysical Union (AGU) |
| ISSN |
0043-1397 |
|
|
| Audience: |
|
international |
|
| Publication date: |
|
2006-10-04 |
|
| Volume: |
|
42 |
|
| Page, identifiant, ...: |
|
W10403 |
|
|
Export this paper
