Abstract
Wind-profiling lidars are now regularly used in boundary-layer meteorology and in applications such as vertical wind field measurement. In order to verify the accuracy of the Doppler wind lidar, the major domestic Doppler wind lidar manufacturers were organized to compare the Minute-level average wind speed and direction data measured by the lidar to which measured by meteorological gradient tower and L band Sounding radar in Shenzhen and Zhangjiakou, respectively. The result of comparison with the wind cup on the meteorological gradient tower is in good agreement, the correlation coefficient of wind speed is close to or higher than 90 %, and the maximum standard deviation of the wind direction is about 7° except the inflection point. When the L-band sounding radar is used as a reference for the lidar equipment which joint the comparison. The system difference and standard deviation of daily wind speed and direction vary greatly, and the reliability is poor. At the same time, it was founded that compared with the 1-minute average data, when the 10-minute average data were used for comparison, the system deviation and standard deviation were reduced. That mean the results were more stable and reliable. The comparison results show that the technical indicators of several domestic lidar equipment are equivalent to windcube indicators made by Vaisala and complying with the World Meteorological Organization's requirements for the Coherent Doppler Lidar indicator for near-term weather forecasts. It shows the lidars are reliable to obtain wind speed and direction parameters at different altitudes in real time.
Highlights
Considering the poor structural stability, high cost of construction and site constraints, the traditional wind tower can just detect the wind field in low height and has limited detection range (Matthew et al, 2020)
As can be seen from that table, wind speed accuracy of six doppler wind lidars which participate in the comparison are less than 2 m/s and wind direction accuracy of seven lidars are less than 30°
It is found that multiple Doppler wind lidar devices of various manufacturers are highly reliable, and they can perform unattended 7×24 hours continuous and stable operation
Summary
Considering the poor structural stability, high cost of construction and site constraints, the traditional wind tower can just detect the wind field in low height and has limited detection range (Matthew et al, 2020). Its detection accuracy is high and can be used to continuously observe at different altitudes At present, it has become one of the most effective means to measure the atmospheric wind field as well as a wide range of applications in environmental protection, aerospace flight support, wind power and national defense (Antuñano et al, 2017). The median of the halfhourly averaged wind speed for the intercomparing data set is 8.2 m/ s−1, with a lower quartile of 5.4 m/ s−1 and an upper quartile of 11.6 m/s−1(Päschke et al, 2015) To verify their detection performance, the synchronous observation data of three-type wind lidars were analyzed at Hangzhou National Reference Climate Station by using the data of sounding observation and L-band stationary wind profiler as the reference (Qin et al., 2019).
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