Mingxing LI1,2 and Zong-Liang Yang1 1 Department of Geological Sciences, The Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas, USA 2 RCE-TEA, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Groundwater is one of the most important land water cycle components, serving as water source/sink, particularly in the regions with shallow groundwater, impacting soil moisture fluctuations and then ecosystem conditions. The simulation of Water Table Depth (WTD) has been drawing attentions in the land surface model, until now few of the land surface models can simulate the WTD that can be compared with observed WTD. Fan et al. developed a scheme (LEAF-Hydro) describing the interactions between groundwater, soil moisture, rivers and flood plains. The scheme defined 14 resolved soil layers and a layer with variable thickness, connecting the water between groundwater, soil water, rivers and flood plains. The simulation validations of WTD and interactions between the surface water indicated that simulated WTD were reasonable well comparing with USGS's observations. Although the land surface model of Noah-MP incorporated four optional soil water schemes and an equilibrium groundwater scheme of SIMGM, its WTD is a conceptualized variable, the simulations has not been compared with observations by now. Based on such a developing condition of Noah-MP, we try to cast light on it, and to couple the Fan's groundwater scheme into Noah-MP to work out more complete physical processes of land water cycle, and make WTD simulations comparable with observations. Then we plan to simulate the WTD in the entire North America during 2000-2004 using the coupled land surface model NOAH-MP, to validate WTD simulations and analyze WTD's characteristics under changing climate. Key words: water table depth, NOAH-MP, LEAFhydro
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