Theoretical and modeling studies of the marine planetary boundary layer

Details Theoretical and modeling studies of the marine planetary boundary layer Theoretical and modeling studies of the marine planetary boundary layer

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990csu..reptr....r&link_type=abstract

Annual Report, 15 Dec. 1989 - 14 Dec. 1990 Colorado State Univ., Fort Collins. Dept. of Atmospheric Science.

Physics

Air Water Interactions, Atmospheric Boundary Layer, Atmospheric Circulation, Atmospheric Models, Marine Meteorology, Mathematical Models, Planetary Boundary Layer, Convective Flow, Kinetic Energy, Ocean Models, Prediction Analysis Techniques, Stratocumulus Clouds, Turbulence, Vortices

Scientific paper

The research goals were: (1) to gain an improved theoretical understanding of and a predictive capability for partly cloudy boundary layers, and to test these ideas against data acquired in the field and (2) to investigate the role of air-sea interactions in regulating cloud amount in the marine boundary layer. The objectives were to produce an extensive set of theoretical and numerical results, leading to better physical understanding of the cloudy marine boundary layer and provide a theoretical basis for the planning and execution of the Atlantic Stratocumulus Transition Experiment (ASTEX). A new type of boundary-layer model was developed that combines second order closure with a bulk representation of the vertical structure. The boundary-layer depth and turbulence kinetic energy (TKE) are prognostically determined. The large turbulent eddies that are primarily responsible for the fluxes are modeled as convective circulations, with ascending and descending branches. The interior of the boundary layer is bounded above by a thin entrainment layer and below by a thin ventilation layer. Conservative variables such as the the equivalent potential temperature have quadratic profiles in the interior. Convective circulations occur, with rising branches occupying fractional area sigma, which is predicted by the model. The upper ocean is represented by a mixed layer whose depth can be either fixed or variable, depending on the objectives of the numerical experiment being conducted.

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