Modeling of surface flux in Tongyu using the Simple Biosphere Model 2 (SiB2)

Abstract

The modeling ability of a stand-alone version of the Simple Biosphere Model 2 (SiB2) was tested mainly through diagnosing the simulated latent heat (LE), sensible heat (H), CO₂ flux, and air temperature at the Tongyu field observation station (44°25′N, 122°52′E, 184 m elevation) of Coordinated Enhanced Observing Period (CEOP), where the land cover is cropland and grassland. In the whole year of 2003, the canopy height and the leaf area index was variable. During non-growth period, the surface would become bare, while during the growth period, the canopy height could reach 2.0 m high over cropland and 0.8 m high over grassland, respectively, and max leaf area index could reach 4.2 and 2.4, respectively. The model was initialized with measurement and driven by half-hourly atmospheric observations. The simulation values for 2003 were compared against measurements. Results show that the model is of a good ability of simulating the hourly latent heat (LE), sensible heat (H), CO₂ flux and temperature during the growth period. Moreover, the daily LE, H and CO₂ flux simulated by SiB2 could reflect their yearly change reasonably. However, the model may overestimate the H generally.

Keywords

cropland / grassland / Simple Biosphere Model 2 (SiB2) / surface flux

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