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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Airborne active and passive microwave observations of Super Typhoon Flo
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Airborne active and passive microwave observations of Super Typhoon Flo

机译：超级台风Flo的机载主动和被动微波观测

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Airborne microwave measurements of precipitation associated with Super Typhoon Flo in the western North Pacific were conducted during September 16-18, 1990. The sensor package aboard the NASA DC-8 aircraft included a dual-frequency precipitation radar at 10 GHz and 34 GHz and a host of radiometers operating at 10 GHz, 18 GHz, 19 GHz, 34 GHz, and 92 GHz, as well as three frequencies near the strong water vapor absorption line of 183.3 GHz. The measurements were made during a few passes over the storm center, and active and passive microwave signatures of the rainbands were detected with a fine spatial resolution. The relationship between the measured brightness temperature and radar-estimated rain rate is examined at the frequencies between 10-92 GHz. At both 34 and 92 GHz this relationship is analyzed with the 10 GHz radar reflectivity factor measured at altitudes above the freezing layer as a further constraint. The results show that frozen hydrometeors strongly scatter radiation at these frequencies, especially at 92 GHz. It was shown from a close examination of both active and passive microwave signatures that a significant scattering of radiation at frequencies 118 GHz occurred in the inner eyewall at altitudes of 3-8 km. This scattering of microwave radiation by hydrometeors in both liquid and frozen forms is discussed under the authors' current understanding of the scattering mechanism.
机译：1990年9月16日至18日，进行了北太平洋西部与超级台风Flo相关的降水的机载微波测量。NASADC-8飞机上的传感器套件包括10 GHz和34 GHz的双频降水雷达和在10 GHz，18 GHz，19 GHz，34 GHz和92 GHz以及在183.3 GHz强水蒸气吸收线附近的三个频率下运行的许多辐射计。在风暴中心上空进行了几次测量，并以良好的空间分辨率检测了雨带的有源和无源微波信号。在10-92 GHz之间的频率下检查了测得的亮度温度和雷达估计的降雨率之间的关系。在34 GHz和92 GHz时，将这一关系与在进一步冻结条件下在冻结层以上高度测得的10 GHz雷达反射率因子进行分析。结果表明，冻结的水凝物强烈地散射了这些频率的辐射，尤其是在92 GHz时。从对有源和无源微波签名的仔细检查中可以看出，在3-8 km的高度，内眼墙中出现了118 GHz频率处的辐射显着散射。在作者对散射机理的当前理解下，讨论了水凝物以液态和冷冻形式对微波辐射的这种散射。

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