Characteristics of Polarimetric Radar Variables in Three Types of Rainfalls in a Baiu Front Event over the East China Sea
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概要
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Characteristics of polarimetric radar variables in three rainfall types in a Baiu front event over the East China Sea observed on 1 June 2004 were studied and compared using a C-band polarimetric radar, the CRL Okinawa bistatic polarimetric radar (COBRA). The selected rainfalls are common types in the Baiu season in this area: (1) stratiform type (ST), (2) isolated convective type (ICT) and (3) embedded convective type (ECT). ST was characterized by an obvious bright band in the field of radar reflectivity (Z_<hh>). ICT and ECT had almost the same 30-dBZ echo-top height of about 5.5km, and their strong echo region (Z_<hh>>40dBZ) did not exceed the 0℃ level (4.4km altitude) even in their mature stages. Around the 0℃ level, overall decrease in correlation coefficient between horizontal and vertical polarization signals (ρ_<hv>) and increase in differential reflectivity (Z_<dr>) were observed in ST and ECT, which indicated the presence of a layer of mixed-phase precipitation. By contrast, significant decrease in ρ_<hv> and increase in Z_<dr> were not found in ICT. At lower levels, Z_<dr> ranged from 0 to 1.5dB and most of ρ_<hv> were higher than 0.98 in ST and ECT. The values of Z_<dr> and ρ_<hv> had wider variations in ICT. The characteristics of the vertical profiles of Z_<dr> and ρ_<hv> in ECT are consequently more similar to those in ST rather than to those in ICT, although their echo-top heights of 30dBZ and maximum Z_<hh> near the surface were almost equal. Near the surface, sufficiently below the 0℃ level, ICT had larger Z_<dr> and lower ρ_<hv> than ECT in the region with Z_<hh> stronger than 45dBZ. This indicates that larger raindrops were more dominant in ICT than in ECT at the same Z_<hh> in the intense rainfall. This difference of dominant raindrop sizes appears to reflect the difference in precipitation growth processes between ICT and ECT.
- 2009-10-26
著者
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IGUCHI Toshio
National Institute of Information and Communications Technology
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TAKAHASHI Nobuhiro
National Institute of Information and Communications Technology
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Iguchi Toshio
Applied Electromagnetic Research Center National Institute Of Information And Communications Technol
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Takahashi N
Kagoshima Space Center Space Transportation Mission Directorate Japan Aerospace Exploration Agency
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SHUSSE Yukari
Okinawa Subtropical Environment Remote-Sensing Center, National Institute of Information and Communi
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NAKAGAWA Katsuhiro
Okinawa Subtropical Environment Remote-Sensing Center, National Institute of Information and Communi
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SATOH Shinsuke
Okinawa Subtropical Environment Remote-Sensing Center, National Institute of Information and Communi
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Satoh Shinsuke
Okinawa Subtropical Environment Remote-sensing Center National Inst. Of Information And Communicatio
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Satoh Shinsuke
Okinawa Subtropical Environment Remote-sensing Center National Institute Of Information And Communic
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Shusse Yukari
Okinawa Subtropical Environment Remote-sensing Center National Inst. Of Information And Communicatio
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Shusse Yukari
Okinawa Subtropical Environment Remote-sensing Center National Institute Of Information And Communic
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Takahashi Nobuhiro
Kagoshima Space Center Space Transportation Mission Directorate Japan Aerospace Exploration Agency
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Nakagawa Katsuhiro
Okinawa Radio Observatory Of Communications Research Laboratory Ministry Of Posts And Telecommunicat
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Nakagawa Katsuhiro
Okinawa Subtropical Environment Remote-sensing Center National Institute Of Information And Communic
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Nishida Takashi
Kagoshima Space Center Space Transportation Mission Directorate Japan Aerospace Exploration Agency
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