Ice Depolarization Characteristics on Ka-Band Satellite-to-Ground Path in Stratus Type Rainfall Events

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概要

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• Ice depolarization characteristics are discussed using cross-polarization discrimination (XPD) observations of the CS-2 beacon signal (19.45 GHz, right-hand circular polarization, elevation angle of 49.5°) in the stratus type rainfall events, which show a clear bright band in the simultaneous X-band radar observations. Both amplitude and phase of the mean ice depolarizations are deduced in each rainfall event by subtracting theoretical rain depolarizations from the observed values. In spite of the difference in rainfall rates on the ground, the inferred depolarizations indicate much the same amplitude and phase as those directly obtained in pure ice depolarization events without appreciable rain depolarizations. The origin of the ice depolarizations in the stratus type events, as well as in the pure ice events, seems to be ice crystals near the cloud top which are not very much concerned with the ground rainfall rates. Compared with the radar measurements above the bright band, the ice depolarizations are approximately proportional to the vertical length of the ice region at least up to 3 km above the bright band. This result yields the equivalent "specific depolarization" per unit path length: |Ci|&cong;6×10^<-3> km^<-1> (44dB in XPD) for the mean ice depolarizations in each event. Using this coefficient, the ice effects (ΔXPD), which refer to the deviations of the observed depolarizations from the theoretical rain depolarization, are well described as a function of the height ratio of the ice region to the rain region in the stratus type events. Finally, the ice effects (ΔXPD) are calculated against vertical lengths of the ice region in the case of specific rain heights of 2-4 km. These calculations are performed for various rainfall rates of 2-15 mm/h in view of ground-based rain observations.

• 社団法人電子情報通信学会の論文
• 1994-02-25

著者

• MIYAZAKI Akira

  Department of Biochemistry, Showa University School of Medicine

• MAEKAWA Yasuyuki

  Department of Communication Engineering, Osaka Electro-Communication University

• CHANG Nion

  Department of Electro-Communication Engineering, Osaka Electro-Communication University

• Chang N

  Osaka Electro‐communication Univ. Neyagawa‐shi Jpn

• MAEKAWA Yasuyuki

  Dept. of Telecommunications and Computer Networks, Osaka Electro-Communication University

• Chang Nion

  Department Of Electro-communication Engineering Osaka Electro-communication University:(present Addr

• Maekawa Y

  Dept. Of Telecommunications And Computer Networks Osaka Electro-communication University

• Miyazaki Akira

  Department Of Biochemistry Faculty Of Medicine Showa University

• CHANG Nion

  Department of Communication Engineering,Faculty of Engineering,Osaka Electro-Communication University

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