Time variations of the regional evapotranspiration rate from Gravity Recovery and Climate Experiment (GRACE) satellite gravimetry

Ramillien, Guillaume; Frappart, Frédéric; Güntner, Andreas; Ngo‐Duc, Thanh; Cazenave, Anny; Laval, K.

doi:10.1029/2005wr004331

Cited by 152 publications

(144 citation statements)

References 27 publications

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“…where t is the time, P , ET and R are the basin-averaged precipitation, evapotranspiration and runoff, and TWSC is the terrestrial water storage change (Ramillien et al, 2006). It is seen that the performance of a certain model is connected with its differently simulated runoff.…”

Section: Actual Evapotranspiration and Runoffmentioning

confidence: 97%

Validation of terrestrial water storage variations as simulated by different global numerical models with GRACE satellite observations

Zhang

Dobslaw

Stacke

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Estimates of terrestrial water storage (TWS) variations from the Gravity Recovery and Climate Experiment (GRACE) satellite mission are used to assess the accuracy of four global numerical model realizations that simulate the continental branch of the global water cycle. Based on four different validation metrics, we demonstrate that for the 31 largest discharge basins worldwide all model runs agree with the observations to a very limited degree only, together with large spreads among the models themselves. Since we apply a common atmospheric forcing data set to all hydrological models considered, we conclude that those discrepancies are not entirely related to uncertainties in meteorologic input, but instead to the model structure and parametrization, and in particular to the representation of individual storage components with different spatial characteristics in each of the models. TWS as monitored by the GRACE mission is therefore a valuable validation data set for global numerical simulations of the terrestrial water storage since it is sensitive to very different model physics in individual basins, which offers helpful insight to modellers for the future improvement of large-scale numerical models of the global terrestrial water cycle.

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Section: Actual Evapotranspiration and Runoffmentioning

confidence: 97%

Validation of terrestrial water storage variations as simulated by different global numerical models with GRACE satellite observations

Zhang

Dobslaw

Stacke

et al. 2017

Hydrol. Earth Syst. Sci.

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show abstract

“…Such alternative methods often focus on regional rather than global solutions. An alternative solution for global time-variable gravity fields was provided by an inversion approach of Ramillien et al 2004 andRamillien et al 2005. While a higher accuracy of the alternative solutions has partly been stressed, there exists no final recommendation so far on the superiority of a certain GRACE product.…”

Section: Grace Data Of Continental Water Storage Changementioning

confidence: 99%

Improvement of Global Hydrological Models Using GRACE Data

2008

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After about six years of GRACE (Gravity Recovery and Climate Experiment) satellite mission operation, an unprecedented global data set on the spatio-temporal variations of the Earth's water storage is available. The data allow for a better understanding of the water cycle at the global scale and for large river basins. This review summarizes the experiences that have been made when comparing GRACE data with simulation results of global hydrological models and it points out the prerequisites and perspectives for model improvements by combination with GRACE data. When evaluated qualitatively at the global scale, water storage variations on the continents from GRACE agreed reasonably well with model predictions in terms of their general seasonal dynamics and continental-scale spatial patterns.Differences in amplitudes and phases of water storage dynamics revealed in more detailed analyses were mainly attributed to deficiencies in the meteorological model forcing data, to missing water storage compartments in the model, but also to limitations and errors of the GRACE data. Studies that transformed previously identified model deficiencies into adequate modifications of the model structure or parameters are still rare. Prerequisites for a comprehensive improvement of large-scale hydrological models are in particular the consistency of GRACE observation and model variables in terms of filtering, reliable error estimates, and a full assessment of the water balance. Using improvements in GRACE processing techniques, complementary observation data, multi-model evaluations and advanced methods of multi-objective calibration and data assimilation, considerable progress in large-scale hydrological modelling by integration of GRACE data can be expected.

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“…A number of studies have derived ET estimates from GRACE observations in large basins, e.g., [11,33,34].…”

Section: Et Estimates From Grace Rainfall and Discharge Observationsmentioning

confidence: 99%

A Comparative Study of GRACE with Continental Evapotranspiration Estimates in Australian Semi-Arid and Arid Basins: Sensitivity to Climate Variability and Extremes

Shen

Leblanc

Frappart

et al. 2017

Water

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This study examines the dynamics and robustness of large-scale evapotranspiration products in water-limited environments. Four types of ET products are tested against rainfall in two large semi-arid to arid Australian basins from 2003 to 2010: two energy balance ET methods which are forced by optical satellite retrievals from MODIS; a newly developed land surface model (AWRA); and one approach based on observations from the Gravity Recovery and Climate Experiment (GRACE) and rainfall data. The two basins are quasi (Murray-Darling Basin: 1.06 million km 2 ) and completely (Lake Eyre Basin: 1.14 million km 2 ) endorheic. During the study period, two extreme climatic events-the Millennium drought and the strongest La Niña event-were recorded in the basins and are used in our assessment. The two remotely-sensed ET products constrained by the energy balance tended to overestimate ET flux over water-stressed regions. They had low sensitivity to climatic extremes and poor capability to close the water balance. However, these two remotely-sensed and energy balance products demonstrated their superiority in capturing spatial features including over small-scale and complicated landscapes. AWRA and GRACE formulated in the water balance framework were more sensitive to rainfall variability and yielded more realistic ET estimates during climate extremes. GRACE demonstrated its ability to account for seasonal and inter-annual change in water storage for ET evaluation.

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Time variations of the regional evapotranspiration rate from Gravity Recovery and Climate Experiment (GRACE) satellite gravimetry

Cited by 152 publications

References 27 publications

Validation of terrestrial water storage variations as simulated by different global numerical models with GRACE satellite observations

Validation of terrestrial water storage variations as simulated by different global numerical models with GRACE satellite observations

Improvement of Global Hydrological Models Using GRACE Data

A Comparative Study of GRACE with Continental Evapotranspiration Estimates in Australian Semi-Arid and Arid Basins: Sensitivity to Climate Variability and Extremes

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