Title:		Horizontal wind speed and direction profiles from Doppler lidar
Location:	Scottsboro Airport Site for Vortex-SE-2017
Lat/Lon:	34.68720 degN, -86.00490 degE
Date updated: 	30 September 2017
Contact: 	Dave Turner, NOAA (dave.turner@noaa.gov)
DOI:            10.5065/D6P55M7B
System:  	Halo Streamline lidar, which is part of the CLAMPS-2 facility

--- Background

Doppler lidars transmit pulses of 1.5 um wavelength laser energy into the atmosphere, which scatters off aerosol particles and hydrometeors.  The lidar measures the intensity of this return, as well as its radial velocity.  The lidar has a scanner which allows the system to scan anywhere in the hemisphere, and typically a fixed scan strategy is used.

These data were derived from plane-parallel-indicator (PPI) scans, which were collected approximately every 2 minutes.  In this scan, data were collected at 8 different azimuths each at 60 degrees elevation.  These data were processed using the velocity-azimuth-display (VAD) technique by Dave Turner.  The RMS field in the file indicates the goodness-of-fit to the assumed sine wave.  The field "maxht" indicates the maximum height that the data should be used.  Note that there are 1-sigma error bars on the lidar wind profiles.

This dataset was collected at the Scottsboro Airport in Alabama during the VORTEX-SE-2017 field campaign.  This lidar is the Halo Streamline system, which is part of the Collaborative Lower Atmospheric Mobile Profiling System (CLAMPS-2). 

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