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一台用于观测对流层和平流层风场的车载瑞利测风激光雷达于安徽合肥建成,该雷达使用双边缘技术,设计探测高度10~40 km,距离分辨率分别为100 m(20 km高度以下)和500 m(20 km高度以上)。在2011年夏季该雷达于新疆乌鲁木齐地区(42.1°N,87.1°E)进行了风场观测实验并成功观测到了平流层准零风层大气结构,给出了几组夜间典型的风场数据,根据观测结果得出:准零风层底部高度稳定在17~18 km高度而不随时间变化,而准零风层厚度则随时间有一个先增大后减小的趋势,并在北京时间凌晨0点~3点期间达到最大值。在观测中出现的准零风层厚度最大值超过15 km,最小值则仅有约2~3 km。分析认为:准零风层厚度的变化与夜间平流层接收到的紫外线辐射强度变化有关,同一时刻不同纬度上的平流层接收的紫外线辐射强度变化程度不同,导致平流层温度梯度继而大气环流的速度发生变化,从而引起准零风层厚度变化。
An on-board Rayleigh wind-lidar for observing wind fields in the troposphere and stratosphere was built in Hefei, Anhui Province. The radar uses double-edge technology with a designed detection height of 10-40 km and a range resolution of 100 m (20 km height Below) and 500 m (above 20 km altitude). In the summer of 2011, the wind field observation experiment was conducted in Urumqi, Xinjiang (at a temperature of 42.1 ° N, 87.1 ° E) and the atmospheric structure of the quasi-zero stratosphere was successfully observed. Several typical night-time wind field data were obtained, According to the observation results, the bottom of the quasi-zero wind layer is stable at the height of 17-18 km without changing with time, while the thickness of the quasi-zero wind layer increases first and then decreases with time. At the midnight of 0:00 GMT, Point ~ 3:00 to reach the maximum value. The maximum thickness of quasi-zero air layers appearing in observation exceeds 15 km, and the minimum value is only about 2 ~ 3 km. The analysis shows that the change of the thickness of the quasi-zero wind layer is related to the change of the ultraviolet radiation intensity received by the night stratosphere. The intensity of the ultraviolet radiation received by the stratosphere at different latitudes varies at the same time, resulting in the temperature gradient of the stratosphere and then the atmospheric circulation velocity Changes, resulting in changes in the thickness of quasi-zero wind.