481
20
Validation of Gravity
Recovery and Climate
Experiment Data for
Assessment of Terrestrial
Water Storage Variations
Pat J.-F. Yeh, Qiuhong Tang, and Hyungjun Kim
20.1 INTRODUCTION
Global water cycle directly affects the global circulation of both atmosphere and
ocean and, hence, is instrumental in shaping the weather and climate of the earth.
However, our quantitative knowledge of the global water cycle is quite poor; largescale measurements of the states and fluxes of various global reservoirs on time
CONTENTS
20.1 Introduction .................................................................................................. 481
20.2 Gravity Recovery and Climate Experiment Satellite Mission ..................... 482
20.3 Background ................................................................................................... 485
20.3.1 Terrestrial Water Balance Computation ........................................... 485
20.3.2 Combined Land–Atmosphere Water Balance Computation ............ 485
20.4 Data ............................................................................................................... 486
20.4.1 GRACE TWS Data ........................................................................... 486
20.4.2 Illinois In Situ Observations ............................................................. 490
20.4.3 MATSIRO LSM ............................................................................... 492
20.4.4 Data Used in the Combined Land–Atmosphere Water Balance
Computation ..................................................................................... 493
20.5 Results ........................................................................................................... 494
20.5.1 GRACE TWSA versus In Situ Measurements in Illinois ................. 494
20.5.2 GRACE TWSA versus Hydrological Model Simulation in Large
River Basins ...................................................................................... 495
20.5.3 GRACE TWSA versus Combined Land– Atmosphere Water
Balance Estimates ............................................................................. 497
20.6 Conclusions ................................................................................................... 501
References .............................................................................................................. 502
20
Validation of Gravity
Recovery and Climate
Experiment Data for
Assessment of Terrestrial
Water Storage Variations
Pat J.-F. Yeh, Qiuhong Tang, and Hyungjun Kim
20.1 INTRODUCTION
Global water cycle directly affects the global circulation of both atmosphere and
ocean and, hence, is instrumental in shaping the weather and climate of the earth.
However, our quantitative knowledge of the global water cycle is quite poor; largescale measurements of the states and fluxes of various global reservoirs on time
CONTENTS
20.1 Introduction .................................................................................................. 481
20.2 Gravity Recovery and Climate Experiment Satellite Mission ..................... 482
20.3 Background ................................................................................................... 485
20.3.1 Terrestrial Water Balance Computation ........................................... 485
20.3.2 Combined Land–Atmosphere Water Balance Computation ............ 485
20.4 Data ............................................................................................................... 486
20.4.1 GRACE TWS Data ........................................................................... 486
20.4.2 Illinois In Situ Observations ............................................................. 490
20.4.3 MATSIRO LSM ............................................................................... 492
20.4.4 Data Used in the Combined Land–Atmosphere Water Balance
Computation ..................................................................................... 493
20.5 Results ........................................................................................................... 494
20.5.1 GRACE TWSA versus In Situ Measurements in Illinois ................. 494
20.5.2 GRACE TWSA versus Hydrological Model Simulation in Large
River Basins ...................................................................................... 495
20.5.3 GRACE TWSA versus Combined Land– Atmosphere Water
Balance Estimates ............................................................................. 497
20.6 Conclusions ................................................................................................... 501
References .............................................................................................................. 502