Cloud perturbations of temperature and humidity: A les study |
| |
Authors: | Peter Bechtold Johannes W. M. Cuijpers |
| |
Affiliation: | (1) Laboratoire d'Aérologie (URA CNRS 354), Observatoire Midi-Pyrénées, 31400 Toulouse, France;(2) IMAU, University of Utrecht, Postbus 80.000, 3508 TA Utrecht, The Netherlands |
| |
Abstract: | A series of Large-Eddy Simulations (LES) has been run for typical cases of marine cloudtopped boundary layers under suppressed conditions, ranging from cumulus-topped to stratocumulus boundary layers, in order to assess the temperature and humidity perturbations of boundary-layer clouds with respect to the environmental air.The results show that the mean incloud values of temperature and virtual potential temperature are close to the respective environmental values, but slightly cooler (0.1 K). Clouds form in regions that are essentially more moist than the environment. In contrast, the conservative variables liquid potential temperature and total water specific humidity have very different incloud and environmental values for which an analytical solution is given. Furthermore, the practical consequences of these findings for large-scale meteorological parameterizations are discussed. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|