||Application of GRACE to improve a land model for use in climate models
This study presents how GRACE-derived terrestrial water storage (TWS) variations can be used to improve the performance of a land model for use within climate models in modeling TWS seasonal variations and water fluxes.
This study first evaluates the performance of the National Center for Atmospheric Research (NCAR) Community Land Model (CLM) in modeling TWS variations against that derived with GRACE satellites. The standard CLM produces a weaker TWS seasonal variation than GRACE. However, a modified version of CLM, which includes a more realistic runoff scheme and a more permeable frozen soil scheme, produces TWS variations that agree reasonably well with that of GRACE in global river basins of various scales. The modified CLM that produces a more accurate runoff and a more accurate TWS variation results in favorable changes in the modeled evapotranspiration (ET), which is of a weaker annual cycle than the standard CLM, in the Amazon River basin.