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Motivations

Development of a Simple Groundwater Model for Use in Climate Models and Evaluation with Gravity and Climate Experiment Data. Guo-Yue Niu, Zong-Liang Yang, Robert E. Dickinson, Lindsey E. Gulden, and Hua Su, Journal of Geophysical Research , Vol. 112, D07103, doi:10.1029/2006JD007522, 2007.

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Motivations

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  1. Development of a Simple Groundwater Model for Use in Climate Models and Evaluation with Gravity and Climate Experiment Data Guo-Yue Niu, Zong-Liang Yang, Robert E. Dickinson, Lindsey E. Gulden, and Hua Su, Journal of Geophysical Research, Vol. 112, D07103, doi:10.1029/2006JD007522, 2007

  2. Motivations • Develop a simple groundwater model (SIMGM) to represent groundwater dynamics in GCMs • Evaluate SIMGM against observations to see whether this model is realistic • Compare the updated model to the previous model to investigate the impact of this modification on the simulation of soil moisture and evapotranspiration

  3. Background

  4. Background • Recent study shows that surface runoff is an exponential function of water table depth. • TOPMODEL-based runoff scheme formulates the base flow as an exponential function of water table depth. • Deficiencies of current land surface models • Several methods to improve the model

  5. Add an unconfined aquifer to an LSM’s soil column Apply a simple TOPMODEL-based runoff scheme: Model Descriptions

  6. Represent groundwater recharge and discharge processes Update the gravitational drainage with the groundwater recharge as the lower-boundary condition The water table depth is converted from the aquifer water storage scaled by the specific yield (0.2) Model Descriptions

  7. Evaluation against GRDC Runoff Product

  8. Evaluation against GRDC Runoff Product

  9. Evaluation with GRACE

  10. Evaluation with GRACE

  11. Relationship of P – E with Recharge & Discharge

  12. Comparison to FD

  13. Comparison to FD

  14. Comparison to FD

  15. Conclusions • SIMGM was developed to represent groundwater dynamics in GCMs. • Global runoff produced by SIMGM agrees well with the GRDC runoff. • Both modeled total water storage and water table depth anomalies are in good agreement with those from GRACE, • Discharge, recharge, soil water and water table depth are controlled by P-E. • SIMGM produced much more soil moisture and 4% - 16% more annual ET than FD.

  16. Discussions • Integration elements • Is aquifer connected to the bottom layer of the soil column? • Specific yield? • Initialization of the model

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