Global time variations of hydrological signals from GRACE satellite gravimetry

被引:103
作者
Ramillien, G [1 ]
Cazenave, A [1 ]
Brunau, O [1 ]
机构
[1] Observ Midi Pyrenees, LEGOS, CNES, UMR 5566, F-31401 Toulouse 04, France
关键词
global hydrology; GRACE satellite; inverse problem; time-variable gravimetry;
D O I
10.1111/j.1365-246X.2004.02328.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Successfully launched in 2002 mid-March, the goal of the Gravity Recovery And Climate Experiment (GRACE) satellite mission is to measure the spatio-temporal variations of the gravity field of the Earth to high accuracy (similar to1 cm in terms of geoid height) and a spatial resolution of similar to200-300 km, for a nominal period of 5 yr. The unprecedented precision of the GRACE mission will enable us to detect tiny time variations of the gravity field related to global redistributions of water and air mass inside fluid envelops at the surface of the Earth. In this paper, we present a new approach based on linear inverse methods to separate the different contributions of the main surface fluid reservoirs (oceans, atmosphere, total continental water storage including snow, soil wetness, ground water and ice caps) from monthly synthetic GRACE geoids. The synthetic geoids were computed from outputs of global models of different climatic fields. Because of the non-uniqueness of the classical inverse problems in gravimetry, independent information was added before inverting the synthetic geoids. Geoid solutions associated with each fluid contribution were then converted into water-equivalent thickness maps. Validation of the continental water storage solutions was performed by comparing total soil water estimates [soil moisture (SM) plus groundwater] with predictions of a global hydrological model in 71 different drainage basins of the world. Analysis of the a posteriori errors of the solutions suggests that the inversion method developed in this study allows recovering monthly water mass changes with a cm precision.
引用
收藏
页码:813 / 826
页数:14
相关论文
共 34 条
[21]  
NOILHAN J, 1989, MON WEATHER REV, V117, P536, DOI 10.1175/1520-0493(1989)117<0536:ASPOLS>2.0.CO
[22]  
2
[23]  
PEROSANZ F, 1995, THESIS U P SABATIER
[24]  
PRESS WH, 1998, NUMERICAL RECIPES C, P994
[25]   Detectability of variations in continental water storage from satellite observations of the time dependent gravity field [J].
Rodell, M ;
Famiglietti, JS .
WATER RESOURCES RESEARCH, 1999, 35 (09) :2705-2723
[26]   The potential for satellite-based monitoring of groundwater storage changes using GRACE: the High Plains aquifer, Central US [J].
Rodell, M ;
Famiglietti, JS .
JOURNAL OF HYDROLOGY, 2002, 263 (1-4) :245-256
[27]   An analysis of terrestrial water storage variations in Illinois with implications for the Gravity Recovery and Climate Experiment (GRACE) [J].
Rodell, M ;
Famiglietti, JS .
WATER RESOURCES RESEARCH, 2001, 37 (05) :1327-1339
[28]   OCEAN GENERAL-CIRCULATION FROM A GLOBAL EDDY-RESOLVING MODEL [J].
SEMTNER, AJ ;
CHERVIN, RM .
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1992, 97 (C4) :5493-5550
[29]   How well does a 1/4 degrees global circulation model simulate large-scale oceanic observations? [J].
Stammer, D ;
Tokmakian, R ;
Semtner, A ;
Wunsch, C .
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1996, 101 (C11) :25779-25811
[30]  
Swenson S., 2002, J GEOPHYS RES, V107, pB9, DOI [DOI 10.1029/2001JB000576, 10.1029/2001J8000576]