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

01 November 2013, 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. Previous research showed that variability existed between separated lidars, but did not explain the cause. This research seeks to explain lidar variability and builds upon the BLISS group’s previous Lower Atmospheric Boundary Layer Experiments (LABLE-1 and LABLE-2). Given the homogenous terrain of the SGP site, wind conditions are thought to be a function of the heterogeneous land surfaces consisting of cropland and pastureland, and research is in progress to determine turbulence 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. Vertical velocity and attenuated backscatter were used to calculate boundary layer height (zi), noise and signal variance, skewness, and other parameters. These parameters will be correlated with vertical profiles of wind speed and direction, obtained from the Doppler lidar using the Velocity Azimuth Display technique.

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