龙门风廓线雷达与探空雷达水平风场对比分析

Comparison and Analysis of Horizontal Wind Fields Derived from a Longmen Wind Profiler and a Heyuan Sounding Radar

利用2019年龙门风廓线雷达与河源L波段探空雷达探测资料,对二者水平风场进行对比分析。结果表明:1)无论是否有降水,在选定的对比高度下,龙门风廓线雷达和河源探空雷达二者水平风速整体均呈显著正相关。2)龙门风廓线雷达水平风速较探空整体偏小,无降水时除850 hPa偏大、其余各层偏小;有降水时高空偏大,低空偏小。3)降水会降低风廓线雷达水平测风精度,低层影响更大,其中水平风速影响最大为850 hPa。4)风廓线雷达水平风速资料较水平风向资料更可靠。5)降水会使低层水平风向样本率降低、高层水平风向样本率上升。6)水平测风资料14:00优于02:00、20:00优于08:00,水平风速有效样本率秋季最高,水平风向有效样本率排序为夏季最高。

Using the data detected by a wind profiler in Longmen and an L-band sounding radar in Heyuan in 2019,this work compared and analyzed the horizontal wind fields derived by the two radars.The results are shown as follows.1)Regardless the presence of precipitation,the wind profiler showed a signifi-cantly positive correlation with the sounding radar in overall horizontal wind speed at selected altitudes for comparison.2)The wind profiler had generally smaller horizontal wind speed than sounding;in the case of rain-free conditions,its horizontal wind speed was all smaller than sounding at all levels except for 850 hPa,and when there was precipitation,it reported a larger upper-level value but a smaller low-level value than sounding.3)The presence of precipitation reduced the accuracy of the wind profiler’s horizontal wind measurements,especially for the low level,with 850 hPa being the level affected the most.4)For the wind profiler,its horizontal wind speed data was more reliable than its horizontal wind direction data.5)The presence of precipitation decreased the sample rate of low-level horizontal wind direction but increased that of upper-level one.6)For horizontal wind measurements,the quality was better at 14:00 and 20:00 than at 02:00 and 08:00,respectively.The samples of horizontal wind speed were most effective in autumn while those of horizontal wind direction were most effective in summer.