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세미나

세미나 상세보기 입니다.
발표자 신혜윰 박사
소속 NOAA/GFDL and NCAR/CPAESS
제목 Toward Scale-Aware Physics Parameterization for Dry Convective Boundary Layer : From an LES Analysis to a Simple Model
문의처 02-880-6723
자료 Hyeyum Shin(20170912).docx [15028 byte] 자료 다운로드
시간 2017-09-12 11:00~12:00
장소 501동 504호
내용요약

[Abstract]

   

The gray zone of a physical process in numerical models is defined as the range of model resolution in which the physical process is partly resolved, but yet needs to be parameterized at the same time. Thanks to increase in computing power, numerical simulations with the spatial resolution of a few kilometers or finer have been realized and their advantages have been reported in recent decades, while the problem of the gray zone problem in convective boundary layer (CBL) has remained at the higher resolution.

  

In the first half of this talk, a reference scale dependency is suggested for the subgrid-scale (SGS) vertical transport in CBL, and its dependency on height, variable, and CBL stability (i.e., u*/w*) is discussed. The reference is considered as a true solution in the gray zone, and scale-aware PBL parameterizations are expected to reproduce it.

   

In the second half of this talk, a simple model to represent the SGS transport in the gray zone is introduced, via a prescribed vertical transport profile and scale dependency functions fitted to the Large Eddy Simulation (LES) results.

   

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