Boundary Layer, Urban Meteorology, and Land-Surface Processes Seminar Series presents...
Measuring water vapor variance and skewness in the convective boundary layer
National Severe Storms Laboratory, Norman, OK
15 October 2012, 4:00 PM
National Weather Center, Room 5930
120 David L. Boren Blvd.
University of Oklahoma
Water vapor variance and skewness profiles measured by an operational Raman lidar in north-central Oklahoma in quasi-stationary (i.e., non-growing) convective mixed layers over several years have been analyzed. This dataset demonstrates that the atmospheric variance profile is quite variable, especially at the top of the boundary layer; furthermore, this variability at the top of the mixed layer is not well correlated with any of the traditional ground-based convective scales. However, the skewness of the water vapor profile narrows significantly at the top of the boundary layer, and seems to be quite repeatable. These data also demonstrate how the covariance of the water vapor mixing ratio in the convective mixed layer depends strongly on the variance at the top of the mixed layer.