Influence of Soil Moisture on Boundary Layer Cloud Development

• Published in: Journal of hydrometeorology Vol. 5; no. 1; pp. 86 - 99
• Main Authors: Ek, M. B., Holtslag, A. A. M.
• Format: Journal Article
• Language: English
• Published: American Meteorological Society 01.02.2004
• Subjects: aardoppervlak; atmosferische grenslaag; atmospheric boundary-layer; bodemwater; clouds; daytime evolution; energy-balance; eta-model; land surface; Meteorologie (algemeen); Meteorology (General); pine forest; relative-humidity; simulation; soil water; solar-radiation; surface parameterization schemes; water; wolken
• ISSN: 1525-755X; 1525-7541
• DOI: 10.1175/1525-7541(2004)005<0086:iosmob>2.0.co;2

The daytime interaction of the land surface with the atmospheric boundary layer (ABL) is studied using a coupled one-dimensional (column) land surface–ABL model. This is an extension of earlier work that focused on modeling the ABL for 31 May 1978 at Cabauw, Netherlands; previously, it was found that coupled land–atmosphere tests using a simple land surface scheme did not accurately represent surface fluxes and coupled ABL development. Here, findings from that earlier study on ABL parameterization are utilized, and include a more sophisticated land surface scheme. This land surface scheme allows the land–atmosphere system to respond interactively with the ABL. Results indicate that incoupledland–atmosphere model runs, realistic daytime surface fluxes and atmospheric profiles are produced, even in the presence of ABL clouds (shallow cumulus). Subsequently, the role of soil moisture in the development of ABL clouds is explored in terms of a new relative humidity tendency equation at the ABL top where a number of processes and interactions are involved. Among other issues, it is shown that decreasing soil moisture may actually lead to an increase in ABL clouds in some cases.