Cloud-topped boundary layer modeling: Application to the Pre-ASTEX-91 data
- Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Atmospheric Physics
- Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Numerical Mathematics
The differential E-e 40-levels model of the atmospheric cloud-topped boundary layer was developed with respect to the experiment Pre-ASTEX-91 tasks. It has been completed by detailed radiation scheme, as well as by the wave age surface wind stress. The model has allowed them to calculate vertical profiles of wind velocity components, temperature, humidity, cloud liquid water and turbulent parameters up to a height of 2 km. In this model turbulent and radiative experimental data, acoustical remote sensing and parameterizations of the surface fluxes have been used. Calculations and observations have shown a very strong dependence of processes in the boundary layer on the time of the day. Atmospheric boundary layer (ABL) is influenced by longwave radiative cooling at the cloud top and by shortwave radiative heating inside the cloud layer. This leads to the night convection from above and to the day time decoupling of clouds. Sodar data indicated diurnal variations of turbulence intensity and the heights of convection, which are directly correlated with ABL cloudiness amount. The modulation effect of the irradiance by the broken cloudiness and the following impact on the surface turbulent fluxes are essential parts of meso-scale boundary layer interaction in the ocean-atmosphere system.
- OSTI ID:
- 467669
- Report Number(s):
- CONF-9409461-; TRN: IM9721%%97
- Resource Relation:
- Conference: 2. International conference on air-sea interaction and on meterology and oceanography of the coastal zone, Lisbon (Portugal), 22-27 Sep 1994; Other Information: PBD: [1994]; Related Information: Is Part Of Second international conference on air-sea interaction and on meteorology and oceanography of the coastal zone; PB: 343 p.
- Country of Publication:
- United States
- Language:
- English
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