Research Projects

Project at a Glance

Project Status: complete

Title: Radar wind profiler support for California Air Resources Board Lake Tahoe atmospheric deposition studies: 2002-2003

Principal Investigator / Author(s): King, Clark W.

Contractor: Environmental Technology Laboratory, National Oceanic and Atmospheric Administration (NOAA)

Contract Number: 01-342

Research Program Area: Atmospheric Processes


The NOAA Environmental Technology Laboratory (ETL), ETL performed system audits at the four CARB Doppler SODAR/wind profiler sites in the Lake Tahoe area and at the ETL Grass Valley wind profiler site during June 2003. ETL used both radiosonde and tethered-balloon systems for the audit of the radar and sodar systems. While the comparison of GPS sonde wind and temperature data with wind profiler derived wind and temperatures provides a general view of the profiler's performance, it must be kept in mind that since these instruments sample differently, comparisons of their measurements cannot provide unambiguous information on the accuracy of either instrument. These instruments sample different space and time scales. The topography of the Lake Tahoe area would favor variable as opposed to uniform winds because of both terrain and thermal forcing of the winds. Comparisons of GPS sonde and MiniSODAR data have less of a problem when considering the space scale as the comparisons occur in the lowest 200 m, a region where the MiniSODAR and GPS sonde make measurements in generally the same volume unless the winds are strong and the sonde rapidly drifts out of the MiniSODAR's sampling volume. However, the time scale problem still exists. The use of the Tethersonde eliminates some of the space and time scale issues as the sampling volume and averaging periods are similar. Strong winds and turbulence limited the use of the Tethersonde for this study.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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