利用地基遥感资料确定大气边界层高度

Determining the height of atmospheric boundary layer using the data from ground-based remote sensing

利用微脉冲激光雷达和微波辐射计资料确定大气边界层高度.利用激光雷达探测时,云层造成的回波信号会影响算法的准确性和稳定度,采用云识别算法除去云层影响后再利用Haar小波协方差法确定大气边界层高度,得到了更准确的结果.微波辐射计探测当有贴地逆温层存在时,边界层高度定义为贴地逆温层顶部,其他情况下定义为位温梯度最大的高度.两种方法均准确地确定了边界层高度,由激光雷达确定的边界层高度高于微波辐射计的结果,且具有更大的日振幅.激光雷达揭示的边界层高度的发展落后于微波辐射计的结果,微波辐射计所得的边界层高度在当地时间17:00开始下降,激光雷达的边界层高度在18:00后才开始有明显降低.

The atmospheric boundary layer height was determined based on the data measured by micro pulse lidar and microwave radiometer.For the detection of lidar,clouds cause strong echo signals,which affects the accuracy and stability of the algorithm.A certain cloud recognition algorithm was adopted to remove the influence of clouds,and the Haar wavelet covariance method was used to determine the boundary layer height,and more accurate results were obtained.For the detection of the microwave radiometer,the height of the boundary layer was defined as the top of the surface inversion layer when it existed;it was defined as the height with the maximum potential temperature gradient.Both methods could exactly determine the height of the atmospheric boundary layer;the results of lidar was higher than that of microwave radiometer and had a larger daily amplitude.The development of the boundary layer height revealed by lidar fell behind that of the microwave radiometer,and the boundary layer height determined by the microwave radiometer began to decline at 17:00,and that of lidar had a significant decline after 18:00.