Boundary Layer, Urban Meteorology and Land-Surface Processes

Vertical Velocity Turbulence Profiles Measured by Two Horizontally Separated Doppler Lidars

Nathan Anderson
OU School of Meteorology

28 March 2014, 2:00 PM

National Weather Center, Room 5600
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

Two identical Doppler Lidars, belonging to the Atmospheric Radiation Measurement (ARM) Climate Research Facility and OU’s Boundary Layer Integrated Sensing and Simulation (BLISS) group, were deployed at the ARM Southern Great Plains (SGP) site in Lamont, Oklahoma in 2012 and 2013, after initial fieldwork using two lidars in 2010. Given the unique terrain of the SGP site and the heterogeneous land surfaces consisting of cropland and pastureland, the varying upwind conditions are thought to play a role in how turbulent eddies evolve.
Building upon the BLISS group’s previous Lower Atmospheric Boundary Layer Experiments (LABLE-1 and LABLE-2), research is in progress to determine turbulent moment profiles and their relation to upwind fetch during selected periods. Case selection was based on synoptically quiet afternoon periods with a quasi-stationary boundary layer. Attenuated backscatter was used to determine boundary layer height (zi), while statistical moments such as variance and skewness, were calculated using vertical velocity. Utilization of Plan Position Indicators with the Velocity Azimuth Display technique allowed calculation of vertical profiles of wind speed and direction. The effect of wind speed, wind direction and surface fluxes on variance and skewness profiles from lidars separated by 300 meters will be examined.

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