Rainfall Estimation from C-Band Polarimetric Radar in Okinawa, Japan : Comparisons with 2D-Video Disdrometer and 400MHz Wind Profiler

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概要

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• This paper presents an inter-comparison of rainfall parameters (median volume diameter and rain rate) using C-band polarimetric radar, a 2D-video disdrometer and a 400MHz profiler for the Baiu front event of 8-9 June 2005 in Okinawa, Japan. These instruments are part of the Okinawa Sub-Tropical Environment Remote Sensing Center, operated by the National Institute of Information and Communications Technology (NICT). The 2D-video disdrometer is used to derive the mean axis ratio of raindrops versus drop diameter, as well as the drop size distribution for the Baiu event. The data are then used to simulate various relations between polarimetric scattering parameters such as: specific attenuation (A_h), and specific differential attenuation (A_<dp>), versus specific differential phase (K_<dp>) which are required to correct the measured reflectivity at horizontal polarization (Z_h), and the differential reflectivity (Z_<dr>) for rain attenuation. The 2D-video disdrometer data are also used to arrive at retrieval formulas for median volume diameter (D_o) from radar Z_<dr>, and rain rate from radar K_<dp>. The intense Baiu event of 8-9 June 2005 was composed of heavy convective rain cells embedded in large areas of stratiform rain. The inter-comparison of D_o and rain rate (R) between instruments was conducted for 12 hours (03:00-07:00, 11:00-19:00 UTC on 8^<th> June 2004). The C-band radar retrievals were found to be in excellent agreement with the 2D-video disdrometer for the entire period. The 400MHz profiler retrievals of D_o and R were in good agreement with 2D-video disdrometer during the more steady rain periods, with more scatter observed during the heavier convective rain periods. These inter-comparisons demonstrate the accuracy of C-band polarimetric radar to retrieve important rainfall parameters, as well as the accurate correction for rain attenuation using differential propagation phase.

• 2006-08-25

著者

• BRINGI V.N.

  Colorado State University

• THURAI M.

  Colorado State University

• NAKAGAWA K.

  National Institute of Information and Communications Technology

• HUANG G.J.

  Colorado State University

• KOBAYASHI T.

  Meteorological Research Institute

• ADACHI A.

  Meteorological Research Institute

• HANADO H.

  National Institute of Information and Communications Technology

• SEKIZAWA S.

  National Institute of Information and Communications Technology

• Bringi V.n.

  Colorado State Univ. Fort Collins

• Bringi V.

  Colorado State University

関連論文

• Rainfall Estimation from C-Band Polarimetric Radar in Okinawa, Japan : Comparisons with 2D-Video Disdrometer and 400MHz Wind Profiler
• Effect of Natural Variations in Rain Drop Size Distributions on Rain Rate Estimators of 3 cm Wavelength Polarimetric Radar

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