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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 10, 1229-1240, 2017
http://www.atmos-meas-tech.net/10/1229/2017/
doi:10.5194/amt-10-1229-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
30 Mar 2017
Validating precision estimates in horizontal wind measurements from a Doppler lidar
Rob K. Newsom1, W. Alan Brewer2, James M. Wilczak2, Daniel E. Wolfe2,3, Steven P. Oncley4, and Julie K. Lundquist5,6 1Pacific Northwest National Laboratory, Richland, WA 99352, USA
2National Oceanic and Atmospheric Administration, Earth System Research Laboratory, Boulder, CO 80305, USA
3Cooperative Institute for Research in Environmental Sciences, Boulder, CO 80305, USA
4National Center for Atmospheric Research, Boulder, CO 80307, USA
5Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80309, USA
6National Renewable Energy Laboratory, Golden, CO 80401, USA
Abstract. Results from a recent field campaign are used to assess the accuracy of wind speed and direction precision estimates produced by a Doppler lidar wind retrieval algorithm. The algorithm, which is based on the traditional velocity-azimuth-display (VAD) technique, estimates the wind speed and direction measurement precision using standard error propagation techniques, assuming the input data (i.e., radial velocities) to be contaminated by random, zero-mean, errors. For this study, the lidar was configured to execute an 8-beam plan-position-indicator (PPI) scan once every 12 min during the 6-week deployment period. Several wind retrieval trials were conducted using different schemes for estimating the precision in the radial velocity measurements. The resulting wind speed and direction precision estimates were compared to differences in wind speed and direction between the VAD algorithm and sonic anemometer measurements taken on a nearby 300 m tower.

All trials produced qualitatively similar wind fields with negligible bias but substantially different wind speed and direction precision fields. The most accurate wind speed and direction precisions were obtained when the radial velocity precision was determined by direct calculation of radial velocity standard deviation along each pointing direction and range gate of the PPI scan. By contrast, when the instrumental measurement precision is assumed to be the only contribution to the radial velocity precision, the retrievals resulted in wind speed and direction precisions that were biased far too low and were poor indicators of data quality.


Citation: Newsom, R. K., Brewer, W. A., Wilczak, J. M., Wolfe, D. E., Oncley, S. P., and Lundquist, J. K.: Validating precision estimates in horizontal wind measurements from a Doppler lidar, Atmos. Meas. Tech., 10, 1229-1240, doi:10.5194/amt-10-1229-2017, 2017.
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Short summary
Doppler lidars are remote sensing instruments that use infrared light to measure wind velocity in the lowest 2 to 3 km of the atmosphere. Quantifying the uncertainty in these measurements is crucial for applications ranging from wind resource assessment to model data assimilation. In this study, we evaluate three methods for estimating the random uncertainty by comparing the lidar wind measurements with nearly collocated in situ wind measurements at multiple levels on a tall tower.
Doppler lidars are remote sensing instruments that use infrared light to measure wind velocity...
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