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大气科学  2005 

模糊逻辑法在双线偏振雷达识别降水粒子相态中的研究

DOI: 10.3878/j.issn.1006-9895.2005.05.15

Keywords: 模糊逻辑,双线偏振雷达,降水粒子的相态结构,隶属函数

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Abstract:

根据不同相态降水粒子的散射和空间取向等特征建立了基本形式为不对称的T型函数的模糊逻辑识别的隶属函数,完善了该识别方法的流程,并利用美国KOUN雷达的观测资料,详细讨论了利用双线偏振雷达观测资料识别降水粒子相态的方法,并对其在实际业务运用中的合理性和可行性进行分析探讨.通过分析,作者认为:(1)利用模糊逻辑方法处理双线偏振雷达测量到的偏振参数,可以识别降水区域的降水粒子相态,反映降水区域的相态结构,识别的结果基本合理,但还需要资料作进一步的研究.(2)从实际资料的分析结果来看,虽然利用模糊逻辑法识别降水粒子相态得到的结果比较粗,没有明确的数据特征值,但是它基本上能反映各种降水粒子的相态结构,其识别的结果对目前日常的天气预报参考和人工影响天气的作业指挥和效果评估来说还是符合可用的.为中国国内未来的双线偏振雷达业务运行提供参考和帮助.(3)根据有限的观测资料分析表明,降水区域中出现60dBZ以上的回波强度,并不一定就会出现冰雹,还有可能是大粒子的液态降水.综合考虑双线偏振雷达的测量参数,可以得到更合理的结果.

References

[1]  刘志澄, 李柏, 翟武全. 新一代天气雷达系统环境及运行管理. 北京: 气象出版社, 2002. 78ppLiu Zhicheng, Li Bai, Zhai Wuquan. The System Environment and Run Management of China New Generation Radar (in Chinese). Beijing: China Meteorological Press, 2002. 78pp
[2]  Bringi V N, Seliga T A, Aydin K. Hail detection with a differential reflectivity radar. Science, 1984, 225: 1145~1147
[3]  Hall P M, Goddard J W F, Cherry S M. Identification of hydrometeors and other targets by dual-polarization radar. Radio Sci., 1984, 19: 132~140
[4]  Bringi V N, Vivekanandan J, Tuttle J D. Multiparameter radar measurements in Colorado convective storms, Part II: Hail detection studies. J. Atmos. Sci., 1986, 43: 2564~2577
[5]  Aydin K, Zhao Y, Seliga T A. A differential reflectivity radar hail measurement technique: Observations during the Denver hailstorm of 13 June 1984. J. Atmos. Oceanic Technol., 1990, 7: 104~113
[6]  Bringi V N, Chandrasekar V. Polarimetric Doppler Weather Radar. Cambridge University Press, 2001
[7]  Hail M P, Goddard J W F, Cherry S M. Identification of hydrometeors and other targets by Dual-polarization radar. Radio Sci.,1984, 19: 132~140
[8]  刘黎平. 不同相态的模式雹块对5.6 cm雷达波散射及衰减特性的研究. 高原气象, 1991, 10(1): 26~33Liu Liping. The study of different phase hail model to the scatter and attenuation characteristic of 5.6 cm radar echo. Plateau Meteorology (in Chinese), 1991, 10(1): 26~33
[9]  刘黎平, 钱永甫, 王致君. 用双线偏振雷达研究云内降水粒子相态及尺度的空间分布. 气象学报, 1996, 54(5): 590~598Liu Liping, Qian Yongfu, Wang Zhijun. The study of special distribution of phase and size of hydrometeorsin cloud by dual linear polarization radar. Acta Meterologica Sinica (in Chinese), 1996, 54(5): 590~598
[10]  Hubert J, Bringi V N. CSU-CHILL polarimetric radar measurement from a severe hailstorm in eastern Colorado. J. Appl. Meteor., 1998, 37: 453~454
[11]  刘黎平. 双线偏振多普勒天气雷达估测混合区降雨和降雹方法的理论研究. 大气科学, 2002, 26(6): 761~772Liu Liping. A theoretical study of estimations rain and hail rates in mixed-phase areas with dual linear polarization radar. Chinese Jounal of Atmospheric Sciences (in Chinese), 2002, 26(6): 761~772
[12]  Zadeh L A. Fuzzy algorithms. Info. & Ctl., 1968, 12: 94~102
[13]  Liu Hongping, Chandrasehar V. Classification of hydrometeor based on polarimetric radar measurements: Development of fuzzy logic and neuro-fuzzy systems, and in situ verification. J. Atmos. Oceanic Technol., 2000, 17: 140~164
[14]  Straka M J, Zrnic D S. An algorithm to deduce hydrometeor types and contents from multi-parameter radar data. 26th Conference on Radar Meteorology. 1993, 17: 513~515
[15]  Zrnic D, Burgess D. Observation and Classification of Echoes with the Polarimetric WSR-88D Radar. Report of National Servere Storms Laboratory, Norman, Oklahoma, 2003, 19~26 (http://www.nssl.noaa.com)

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