Boundary Layer Cloudiness Parameterizations Using ARM Observations

Albrecht, Bruce

University of Miami (United States)

关键词: Climate, Clouds, Remote Sensing, Boundary Layer;    Clouds;    Turbulence Climate, Clouds, Remote Sensing, Boundary Layer;    Sampling;    Reflectivity;   

DOI  :  10.2172/830034
RP-ID  :  NONE
RP-ID  :  FG02-97ER62337
RP-ID  :  830034

美国|英语

来源: UNT Digital Library

【 摘 要 】

This study used DOE ARM data and facilities to: (1) study macroscopic properties of continental stratus clouds at SGP and the factors controlling these properties, (2) develop a scientific basis for understanding the processes responsible for the formation of boundary layer clouds using ARM observations in conjunction with simple parametric models and LES, and (3) evaluate cumulus cloud characteristics retrieved from the MMCR operating at TWP-Nauru. In addition we have used high resolution 94 GHz observations of boundary layer clouds and precipitation to: (1) develop techniques for using high temporal resolution Doppler velocities to study large-eddy circulations and turbulence in boundary layer clouds and estimate the limitations of using current and past MMCR data for boundary layer cloud studies, (2) evaluate the capability and limitations of the current MMCR data for estimating reflectivity, vertical velocities, and spectral under low- signal-to-noise conditions associated with weak no n-precipitating clouds, (3) develop possible sampling modes for the new MMCR processors to allow for adequate sampling of boundary layer clouds, and (4) retrieve updraft and downdraft structures under precipitating conditions.