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Evaluating the simulated seasonality of soil moisture with earth observation data

Ellis, Richard J.; Taylor, Christopher M.; Weedon, Graham P.; Gedney, Nicola; Clark, Douglas B.; Los, Sietse. 2009 Evaluating the simulated seasonality of soil moisture with earth observation data. Journal of Hydrometeorology, 10. 1548-1560.

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Abstract/Summary

A critical function of a land surface scheme, used in climate and weather prediction models, is to partition the energy from insolation into sensible and latent heat fluxes. Many use a soil moisture function to control the surface moisture fluxes through the transpiration. The validity and global distribution of the parameters used to calculate this soil moisture stress function are difficult to assess. This work presents a method to map soil moisture stress globally from an earth observation vegetation index and precipitation data, and it compares the resulting distributions with output from the Joint U.K. Land Environment Simulator (JULES) land surface scheme. A number of model runs with different soil and vegetation parameters are compared. These examine the sensitivity of the seasonality of soil moisture stress, within the model, to the parameterization of soil hydraulic properties and the seasonality of leaf area index in the vegetation. It is found that the seasonality of soil moisture within the model is more sensitive to the soil hydraulic properties than the leaf area index. The partitioning of throughfall into evaporation and runoff, in the model, is the dominant factor in determining the timing of soil moisture stress.

Item Type: Publication - Article
Programmes: CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes
CEH Topics & Objectives 2009 onwards > Biogeochemistry > BGC Topic 2 - Biogeochemistry and Climate System Processes
CEH Sections: Harding (to 31.07.11)
ISSN: 1525-755X
Additional Keywords: seasonal effects, soil moisture, satellite observations
NORA Subject Terms: Meteorology and Climatology
Hydrology
Date made live: 14 Apr 2010 11:49
URI: http://nora.nerc.ac.uk/id/eprint/5283

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