Linear relation between convective cloud base height and updrafts and application to satellite retrievals
Linear relation between convective cloud base height and updrafts and application to satellite retrievals
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DOI：
10.1002/2015gl064809
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发表时间：
2015-08
影响因子：
5.2
通讯作者：
Youtong Zheng;D. Rosenfeld
中科院分区：
文献类型：
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作者：
Youtong Zheng;D. Rosenfeld
能源部/大气辐射测量计划在南部大平原、亚马逊河中部以及在檀香山和洛杉矶之间的远洋船上进行的测量表明，多普勒激光雷达和95 GHz云雷达测量的上升气流速度与云底高度（Hb）密切线性相关。基于这些关系，提出了一种利用卫星反演云顶行星边界层最大上升气流速度（Wmax）和云底上升气流速度（Wb）的方法。Hb作为上升气流估计的输入，是从卫星反演的云底温度结合欧洲中期天气预报中心再分析得出的2米空气温度获得的。激光雷达和雷达测量的验证表明，Wmax的卫星反演与RMSE（均方根误差）= 0.38 m/s和MAPE（平均绝对百分比误差）= 19%和Wb的RMSE = 0.34 m/s和MAPE = 21%的良好协议。
Measurements done by the Department of Energy/Atmospheric Radiation Measurement program, at the Southern Great Plains, the central Amazon, and on board an oceangoing ship between Honolulu and Los Angeles, show that updraft speeds measured by Doppler lidar and 95 GHz cloud radar are tightly linearly correlated with cloud base height (Hb). Based on these relationships, a method of satellite retrieval of maximum (Wmax) and cloud base (Wb) updraft speeds in cloud topped planetary boundary layer is proposed. Hb, as an input for updraft estimation, is obtained from satellite‐retrieved cloud base temperature in combination with 2 m air temperature derived from European Centre for Medium‐Range Weather Forecasts reanalysis. Validation by the lidar and radar measurements shows good agreements for the satellite retrieval of Wmax with RMSE (root‐mean‐square error) = 0.38 m/s and MAPE (mean absolute percentage error) = 19% and Wb with RMSE = 0.34 m/s and MAPE = 21%.