A one-dimensional simulation of the interaction between land surface processes and the atmosphere

Abstract

A one-dimensional soil-vegetation model is developed for future incorporation into a mesoscale model. The interaction of land surface processes with the overlying atmosphere is treated in terms of three coupled balance equations describing the energy and moisture transfer at the ground and the energy state of the vegetation layer. For a complete description of the interaction, the coupled processes of heat and moisture transport within the soil are included as a multilayer soil model. As model verification, successful reproductions of the observed energy fluxes over vegetated surfaces from the HAEEX-MOBILHY experiment in southwestern France and from the LOTREX-lOE/HIBE88 field experiment in Germany are presented. Finally, some sensitivity studies are performed and discussed in order to investigate the influence of different soil and vegetation types on the energy state of the atmosphere.

Planetary boundary layer and surface layer sensitivity to land surface parameters

“…Jacquemin and Noilhan (1990) found vegetation cover to be the most sensitive surface parameter, strongly influencing the Bowen ratio and the amount of sensible and latent heat flux. Contrary to this result, Wetzel and Chang (1988) and Siebert et al (1992) have noted more sensitivity to the amount of soil water content than to vegetation.…”

“…While Henderson Sellers (1993) found aerodynamic roughness length and Wilson et al (1987) found soil texture to be the most sensitive parameter in their respective simulations, Wetzel and Chang's (1988) experiments show little sensitivity to either roughness length or soil texture. Other factors that may be important include vegetation or canopy resistance to water transfer (stomatal resistance) (Wetzel and Chang, 1988;Siebert et al, 1992;Acs, 1994), root density or distribution (Acs, 1994;Pitman, 1994), leaf area index (Siebert et al, 1992), and surface albedo (Chamey, 1975;Chamey et al, 1977).…”

“…Wetzel and Chang (1988) and Siebert et al (1992) found little sensitivity to vegetation cover using multiple soil-layer models, while Deardorff (1978) and Jacquemin and Noilhan (1990) found the most sensitivity to vegetation cover using the force-restore soil model. Henderson Sellers et al (1995) have noted that climatic differences can occur between methods of soil water prediction (in particular, the bucket model).…”

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

“…In addition to direct field observations, numerical simulations are also one of the powerful methods utilized to study atmosphere-land interactions [8][9][10][11]. Mesoscale numerical weather models have been found to effectively simulate the complex thermal-dynamical processes in the atmospheric boundary layer (ABL), which has been successfully applied in the study of regional circulations.…”

A One-dimensional Ensemble Forecast and Assimilation System for Fog Prediction

“…GOLDING (1993) found that the development of local nocturnal winds in complex terrain often determines the location and timing of fog formation. SIEBERT et al (1992a), SIEBERT et al (1992b) and VON GLASOW and BOTT (1999) finally added a module to resolve small and tall vegetation on a high resolution grid. In these later models, the evolution of the droplet size distribution and cloud condensation nuclei is explicitly resolved, but even today such an approach is computationally very expensive.…”