SVAT-Modeling and scale interactions
Kyaw Tha Paw U1, R. David Pyles1, Liyi Xu1
1 University of California, Atmospheric Science
Key Note 6 in SVAT-Modeling and scale interactions
08.10.2009, 09:00-09:40, Kutschenhaus
The soil-vegetation-atmosphere transport (SVAT) model ACASA (Advanced Canopy Atmosphere Soil Algorithm) has been linked to regional scale models (MM5 and WRF). These linked models allow scaling from the leaf level to continental levels, and allows identification of dominant processes and controlling parameters. Feedback between the microscale canopy interactions and the regional scale models are important, and must be adequately described by detailed turbulent transport parameterizations between layers in the canopy. Results indicate that simplified surface models, such as those using single layers, two-layers, and flux-gradient (K-theory) yield substantially different results than more detailed higher-order closure turbulent transport models. Preliminary comparison with observations shows improvements by using ACASA in MM5 and WRF over the more traditional Land Surface Models, including those imbedded in MM5 and WRF. Advantages and disadvantages of the different models in describing scaling from the leaf to the canopy to the region are discussed.
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