Simultaneous Observations of Thin Humidity Gradients in the Lower Troposphere with a Raman Lidar and the Very High-Frequency Middle- and Upper-Atmosphere Radar
Simultaneous Observations of Thin Humidity Gradients in the Lower Troposphere with a Raman Lidar and the Very High-Frequency Middle- and Upper-Atmosphere Radar
复制标题
用拉曼激光雷达和甚高频中高层大气雷达同时观测对流层低层的薄湿度梯度
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Fukao
中科院分区：
文献类型：
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作者：
H. Luce;T. Takai;Takuji Nakamura;M. Yamamoto;S. Fukao
摘要湿度是大气动力学演变过程中的一个关键参数，也是通过潜热释放形成云和降水的关键参数。因此，连续观测其垂直分布在气象学上是重要的。在没有对流的情况下，对流层低层的湿度分布成几乎水平的分层。在这些层的边缘薄的湿度梯度是已知的甚高频（VHF）平流层-对流层（ST）雷达后向散射在对流层低层的主要原因。在文献中，通过气球测量和低分辨率雷达观测之间的比较，已经多次通过实验证明了这一特性。在目前的工作中，原始结果之间的比较拉曼激光雷达测量的水蒸气和中层和高层大气（MU）雷达测量的回波功率使用范围成像技术显示在高的空间和时间分辨率（150米，120秒）。奥斯...
Abstract Humidity is, among other things, a key parameter in the evolution of atmospheric dynamics and in the formation of clouds and precipitation through latent heat release. The continuous observation of its vertical distribution is thus important in meteorology. In the absence of convection, humidity in the lower troposphere is distributed into nearly horizontally stratified layers. The thin humidity gradients at the edges of these layers are known to be the main cause of very high-frequency (VHF) stratosphere–troposphere (ST) radar backscatter in the lower troposphere. This property has been experimentally demonstrated many times in the literature from comparisons between balloon measurements and low-resolution radar observations. In the present work, original results of comparisons between Raman lidar measurements of water vapor and middle- and upper-atmosphere (MU) radar measurements of echo power using a range-imaging technique are shown at high spatial and temporal resolutions (∼50 m, ∼20 s). Oth...