HR: 17:00h
AN: H24D-04 [Abstracts]
TI: Representing groundwater dynamics in climate models and its impacts on climate modeling
AU: * niu, g
EM: niu@geo.utexas.edu
AF: The University of Texas at Austin, Dept. of Geological Sciences,
Univ. of Texas at Austin, C1100, Austin, TX 78712, United States
AU: Yang, Z
EM: liang@mail.utexas.edu
AF: The University of Texas at Austin, Dept. of Geological Sciences,
Univ. of Texas at Austin, C1100, Austin, TX 78712, United States
AU: Jiang, X
EM: xyjiang@mail.utexas.edu
AF: The University of Texas at Austin, Dept. of Geological Sciences,
Univ. of Texas at Austin, C1100, Austin, TX 78712, United States
AU: Gulden, L E
EM: gulden@mail.utexas.edu
AF: The University of Texas at Austin, Dept. of Geological Sciences,
Univ. of Texas at Austin, C1100, Austin, TX 78712, United States
AB:
We will present an efficient approach to representing groundwater dynamics for climate modeling studies and its
impacts on climate modeling on both global and regional scales. We developed a simple groundwater model
by representing recharge and discharge processes of the water storage in an unconfined aquifer, which is added
as a single integration element below the soil of a land surface model. We evaluated the model against the
Gravity Recovery and Climate Experiment (GRACE) terrestrial water storage change data. The modeled total
water storage (including unsaturated soil water and
groundwater) change agrees fairly well with GRACE estimates in most river basins where the water storage is
not affected by snow water or frozen soil. Together with other changes in the model terrestrial hydrology, including
a groundwater component in a GCM increases evapotranspiration (ET) and precipitation in some arid-to-wet
transition zones. In addition, through root uptakes of water in deep soil, it improves the seasonal prediction of
precipitation in the Central United States.
DE: 1818 Evapotranspiration
DE: 1830 Groundwater/surface water interaction
DE: 1840 Hydrometeorology
DE: 1843 Land/atmosphere interactions (1218, 1631, 3322)
DE: 1878 Water/energy interactions (0495)
SC: Hydrology [H]
MN: 2007 Fall Meeting