HR: 0800h
AN: H11B-1264    [Abstracts]
TI: Spatial and temporal variability of soil moisture and climate variability
AU: * Tang, c
EM: chunlingtang@hotmail.com
AF: Thomas Piechota, University of Nevada, Las vegas, Department of civil and Environmental Engineering , Las Vegas, NV 89154 United States
AU: Piechota, T
EM: piechota@unlv.nevada.edu
AF: Thomas Piechota, University of Nevada, Las vegas, Department of civil and Environmental Engineering , Las Vegas, NV 89154 United States
AB: This research investigates the spatial and temporal variability of soil moisture as related to large scale climate variability. A three layer hydrological model VIC-3L (Variable Infiltration Capacity Model ­C 3 layers) was used in the Colorado River Basin over a 50 year period. The simulation focused on the soil moisture generation between January 1950 and December 2002 at daily time step. Simulation was performed on 1/8 degree resolution for the water balance model. Using wavelet analysis, temporal soil moisture was compared to the Palmer Drought Severity Index (PDSI), precipitation, and streamflow to determine whether deep soil moisture was an indicator of climate extremes. Principle component analysis (PCA) was performed to evaluate the spatial variability soil moisture response to climate variability. Wavelet coherency analysis and PCA analysis for the Colorado River Basin indicate a strong relationship between droughts and the deep soil moisture. Relationships between soil moisture and other large scale climate patterns (e.g., ENSO, PDO, sea surface temperatures) are also evaluated.
DE: 1800 HYDROLOGY
DE: 1807 Climate impacts
DE: 1812 Drought
DE: 1866 Soil moisture
SC: Hydrology [H]
MN: Fall Meeting 2005