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首页> 外文期刊>Geophysical Research Letters >Satellite detection of cloud liquid water over land using polarization differences at 85.5 GHz
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Satellite detection of cloud liquid water over land using polarization differences at 85.5 GHz

机译：利用85.5 GHz的极化差对陆地上的云状液态水进行卫星探测

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A physical retrieval method is described that detects cloud liquid water path (LWP) over land using polarization difference measurements from the Special Sensor Microwave Imager (SSM/I). The brightness temperature difference at 85.5 GHz is divided by the surface emissivity polarization difference to define a normalized polarization difference (NPD). The SSM/I NPD observations are compared to coincident observations of liquid water path fi om upward looking ground-based microwave radiometers in Oklahoma and Kansas for November and December of 1994. The comparisons reveal a moderate correlation and nonlinear relationship (which is expected from theory) between the 85.5 GHz NPD and liquid water path. The NPD method is anticipated to be valid over a broad region of the U.S., excluding the southern Mississippi Valley where the surface emissivity polarization differences are negligible. The observational results indicate that the NPD method holds promise for future routine satellite detection and retrieval of cloud LWP over land. [References: 18]
机译：描述了一种物理检索方法，该方法使用来自特殊传感器微波成像仪（SSM / I）的极化差测量来检测陆地上的云状液体水路径（LWP）。将85.5 GHz处的亮度温度差除以表面发射率极化差，以定义归一化极化差（NPD）。将SSM / I NPD观测值与1994年11月和12月俄克拉荷马州和堪萨斯州地面微波辐射计的液态水路径的同时观测值进行了比较。 ）在85.5 GHz NPD和液态水路径之间。预计NPD方法在美国的广大地区都将是有效的，但南部密西西比河谷地区的表面发射率极化差异可忽略不计。观测结果表明，NPD方法有望为将来的常规卫星探测和陆上云LWP的检索提供希望。 [参考：18]

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