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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >A Surface-Based Imaging Method for Water Vapor and Liquid Clouds Using a Scanning Radiometer at 91 GHz
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A Surface-Based Imaging Method for Water Vapor and Liquid Clouds Using a Scanning Radiometer at 91 GHz

机译：使用91 GHz扫描辐射计的水蒸气和液体云的基于表面的成像方法

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摘要

The Scanning Polarimetric Imaging RAdiometer at 91 GHz with an angular resolution of 0.5 $^{circ}$ was used to investigate the dynamics of the atmosphere. We introduced a new imaging method by continuously scanning the sky over a range of elevation angles in a fixed azimuth direction. The measurements were realized during three different situations: clear sky, sky with water clouds, and sky with cirrus clouds. In most situations, the scan direction was nearly parallel to the mean atmospheric flow. Particularly interesting structures were found in the images with water clouds. In contrast, cirrus clouds are highly transparent. Simulations of the applied imaging method helped to interpret the cloud images, particularly concerning the cloud movement. Characteristic shapes were identified as signatures of motions along the scan line, which were used to estimate the horizontal velocity of water clouds. It was also possible to estimate the integrated water vapor from the clear sky images. They allow a visualization of water vapor parcels. Some of these images contain similar signatures as the clouds, indicating advection of water vapor along the scan line. In the future, we plan to extend these measurements and to combine them with multifrequency observations.
机译：91 GHz的扫描极化成像成像测辐射仪具有0.5°C的角分辨率，用于研究大气动力学。我们通过在固定方位角的一系列仰角范围内连续扫描天空来介绍一种新的成像方法。这些测量是在三种不同情况下实现的：晴朗的天空，带水云的天空和带卷云的天空。在大多数情况下，扫描方向几乎平行于平均大气流量。在带有水云的图像中发现了特别有趣的结构。相反，卷云是高度透明的。应用成像方法的模拟有助于解释云图像，尤其是有关云运动的图像。特征形状被识别为沿着扫描线的运动特征，用于估计水云的水平速度。也有可能从晴朗的天空图像中估算出整合的水蒸气。它们使水蒸气包裹可视化。这些图像中有些包含与云类似的特征，表明水蒸气沿扫描线平流。将来，我们计划扩展这些测量并将它们与多频观测结合起来。

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