Single Doppler radar and lidar studies of the dynamics of mixed layers and overlying stable regionsSome examples of profiles of PBL quantities retrieved from Doppler radar and lidar observations are shown, and the extent to which the deduced quantities agree with the traditional eddy viscosity concept is examined. It is found in one case that the concept of 'top down bottom up' diffusion introduced by Wyngaard (1983) is more pertinent than that of the eddy viscosity. In another case it is found that, in stable layers with sufficiently large Richardson number, the momentum fluxes could be counter-gradient. In this latter case the use of a negative turbulence diffusion coefficient would result in an ill-posed differential equation, thus confusing the 'diffusion problem'.
Document ID
19930053690
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Xu, Mei (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gal-Chen, Tzvi (Oklahoma Univ. Norman, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: International Conference on Radar Meteorology, 25th, Paris, France, June 24-28, 1991, Preprints (A93-37626 15-47)