Application of the Simple Biosphere Model(SiB2) to a Paddy Field for a Period of Growing Season in GAME-Tropics.

The simple biosphere model (SiB2) of Sellers et al. and the revised SiB2 (SiB2-Paddy) incorporated with a paddy model are compared and evaluated using micrometeorological data measured in the paddy field that is one of the GAME-Tropics experimental sites in Thailand. In terms of the diurnal cycle, simulated net radiation, and latent heat flux, the two models are in good agreement with the observation, except for the diurnal variation of latent heat flux simulated by SiB2. Sensible and soil heat fluxes, and assimilation rate by SiB2-Paddy agree well with the observation; however, those simulated by SiB2 are found to be biased. Canopy, water, and soil temperature are also well simulated by SiB-Paddy with parameter adjustment. In terms of the total energy and water balance, net radiation, latent heat flux, and assimilation rate do not differ much between the simulations and the observation. This is partly because the values of sensible heat and soil heat fluxes are too small compared to net radiation and latent heat flux, and the mean biases are not significant. However, SiB2-Paddy is required for realistic simulations of the diurnal cycles of latent heat flux and surface temperature.

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