HR: 10:35h
AN: H52B-02    [Abstracts]
TI: Effects of Global Land Cover Changes on Hydrologic Regime Changes
AU: * Duan, Q
EM: qduan@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808, L-103, 7000 East Avenue, Livermore, CA 94550 United States
AU: Phillips, T
H52B-02 AF: Lawrence Livermore National Laboratory, P.O. Box 808, L-103, 7000 East Avenue, Livermore, CA 94550 United States
AU: Caldeira, K
H52B-02 AF: Carnegie Institute of Washington, Dept. of Global Ecology 260 Panama Street, Stanford, CA 94305 United States
AB: In a series of idealized experiments with the NCAR CAM3 atmospheric general circulation model at LLNL, it was found that land cover changes could result in global warming comparable to the magnitude under a doubled CO2 scenario. For example, global average annual temperature could increase up to 1.6C if the current land cover were changed to all trees, which is equivalent to 75 percent of the warming under a doubled CO2 scenario. Conversely, the global average annual temperature could decrease by 0.4C if the land cover were changed to all grasslands. In this study, we will further analyze the model simulations from these idealized experiments to investigate how land cover changes affect hydrologic regime changes. The goal of this study is to gain a better understanding of the land feedback mechanisms that lead to the global climate changes. We will use a set of hydroclimatic indices including aridity index, evaporation efficiency and runoff coefficient to gain insights into how hydrologic regimes are shifted under different land covers. We will investigate if the changes in hydrologic behaviors are consistent with the imposed land cover changes.
DE: 1225 Global change from geodesy (1222, 1622, 1630, 1641, 1645, 4556)
DE: 1600 GLOBAL CHANGE
DE: 1632 Land cover change
DE: 1655 Water cycles (1836)
SC: Hydrology [H]
MN: Fall Meeting 2005