Development of an identification method of supercooled liquid droplets using a scanning polarimetric cloud radar

• Project/Area Number: 15K05285
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Kyoto University (2017); Nagoya University (2015-2016)
• Principal Investigator: Ohigashi Tadayasu 京都大学, 防災研究所, 特定助教 (80464155)
• Research Collaborator: SHIMIZU Kensaku 明星電気株式会社
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 過冷却水滴 / 雲粒 / 氷晶 / Ka帯レーダー / 雲レーダー / 偏波レーダー / 雲粒子ゾンデ / CPSゾンデ / ミリ波帯雲レーダー / 雲微物理 / 雲粒子センサー / 粒子判別 / 混相雲

Outline of Final Research Achievements

We examined a method of identifying presence of supercooled liquid droplets using a 35 GHz band (Ka band) scanning-type cloud radar. In-situ observations using cloud particle sonde and cloud particle sensor (CPS) sonde and cloud radar observation were carried out. In cases that supercooled liquid droplets are present without ice particles, there is a possibility of identifying supercooled liquid droplets using radar reflectivity and differential reflectivity (ZDR). Since it is considered that the method is applicable in limited regions, other recent identification methods using radar without polarimetric function, lidar, and microwave radiometer were also summarized.

Research Products

• [Int'l Joint Research] Stony Brook University(米国)
• [Int'l Joint Research] McGill University(カナダ)
• [Int'l Joint Research] McGill University(カナダ)
• [Journal Article] Kaバンドレーダーを利用した積乱雲生成段階に関する研究 (2018)
  • Author(s): 中北英一・新保友啓・佐藤悠人・山口弘誠・大東忠保
  • Journal Title: 土木学会論文集B1（水工学） Volume: 74 Pages: 55-60
  • NAID: 130007628265
  • Peer Reviewed
• [Journal Article] Cloud-Top Supercooled Liquid Droplets in Stratiform Clouds Observed during Winter in Inland Hokkaido, Japan (2016)
  • Author(s): Ohigashi, T., K. Tsuboki, M. Oue
  • Journal Title: SOLA Volume: 12 Issue: 0 Pages: 140-145
  • DOI: 10.2151/sola.2016-030
  • NAID: 130005155565
  • ISSN: 1349-6476
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A hydrometeor classification method for X-band polarimetric radar: Construction and validation focusing on solid hydrometeors under moist environments (2015)
  • Author(s): Kouketsu, T., H. Uyeda, T. Ohigashi, M. Oue, H. Takeuchi, T. Shinoda, K. Tsuboki, M. Kubo, and K. Muramoto
  • Journal Title: J. Atmos. Oceanic Technol. Volume: 32 Issue: 11 Pages: 2052-2074
  • DOI: 10.1175/jtech-d-14-00124.1
  • Peer Reviewed / Open Access
• [Presentation] 夏季積乱雲発達初期の偏波雲レーダー観測 (2018)
  • Author(s): 大東忠保・中北英一・山口弘誠・坪木和久
  • Organizer: 平成29年度防災研究所研究発表講演会
• [Presentation] 沖縄周辺の梅雨前線における Ka 帯レーダーの偏波パラメータと雲・降水粒子の微物理特性の関係 (2018)
  • Author(s): 長屋智大・篠田太郎・大東忠保・鈴木賢士・山田広幸・川村誠治・山口弘誠・中北英一・坪木和久
  • Organizer: GSMaP および衛星シミュレータ合同研究集会
• [Presentation] Kaバンドレーダーを利用した積乱雲生成段階に関する研究 (2018)
  • Author(s): 中北英一・新保友啓・佐藤悠人・山口弘誠・大東忠保
  • Organizer: 第62回水工学講演会
• [Presentation] 名古屋大学Ka帯偏波レーダの現状 (2017)
  • Author(s): 篠田太郎・大東忠保・長屋智大・鈴木賢士・川村誠治・山田広幸・山口弘誠・中北英一・久保 守・皆巳幸也・高橋暢宏・坪木和久
  • Organizer: 衛星シミュレータ・GSMaP合同研究集会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2017-03-16
• [Presentation] Cloud particle observation using Cloud Particle Sensor and its possibility of application to aircraft observation (2017)
  • Author(s): Shinoda, T., T. Ohigashi, M. Fujiwara, S. Kawamura, K. Suzuki, K. Yamagchi, E. Nakakita, N. Takahashi, and K. Tsuboki
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Ka・X・C帯二重偏波レーダーの偏波パラメータとHYVISによる直接観測の比較 (2017)
  • Author(s): 長屋智大・篠田太郎・大東忠保・川村誠治・山田広幸・山口弘誠・鈴木賢士・坪木和久・中北英一
  • Organizer: 日本気象学会2017年度春季大会
• [Presentation] Ka帯レーダーを用いた台風1618 号(Chaba) の上層雲の観測 (2017)
  • Author(s): 大東忠保・坪木和久・民田晴也・久島萌人・山田広幸・岩井宏徳
  • Organizer: 日本気象学会2017年度春季大会
• [Presentation] Ka-band radar observation of the outflow-layer clouds of Typhoon Chaba (2016) (2017)
  • Author(s): Ohigashi, T., K. Tsuboki, H. Minda, M. Kyushima, H. Yamada, and H. Iwai
  • Organizer: AOGS 14th Annual Meeting
  • Int'l Joint Research
• [Presentation] Comparison of polarimetric parameters obtained by a Ka-band radar with those by C- and X-band radars in relation on characteristics of hydrometeors (2017)
  • Author(s): Nagaya, T., T. Shinoda, T. Ohigashi, S. Kawamura, H. Yamada, K. Yamaguchi, K. Suzuki, K. Tsuboki, and E. Nakakita
  • Organizer: 38th Conference on Radar Meteorology
  • Int'l Joint Research
• [Presentation] Kaバンドレーダを用いた積乱雲の発生初期の解析 (2017)
  • Author(s): 新保友啓・中北英一・佐藤悠人・山口弘誠・坪木和久・篠田太郎・大東忠保
  • Organizer: 水文・水資源学会2017年度総会・研究発表会
• [Presentation] An analysis of cumulonimbus cloud development using Ka-band Doppler radar (2017)
  • Author(s): Nakakita, E., T. Niibo, H. Sato, K. Yamaguchi, and T. Ohigashi
  • Organizer: International Symposium on Earth-Science Challenges (ISEC) 2017
  • Int'l Joint Research
• [Presentation] Videosonde and radar observations in ice-phase regions of stratiform clouds (2017)
  • Author(s): Ohigashi, T., K. Tsuboki, T. Shinoda, K. Suzuki, S. Kawamura, H. Yamada, K. Yamaguchi, and E. Nakakita
  • Organizer: International Symposium on Earth-Science Challenges (ISEC) 2017
  • Int'l Joint Research
• [Presentation] Relationship between Ka-band polarimetric parameters and characteristics of hydrometeors observed by balloon-borne instruments (2017)
  • Author(s): Nagaya, T., T. Shinoda, T. Ohigashi, S. Kawamura, H. Yamada, K. Yamaguchi, K. Suzuki, K. Tsuboki, and E. Nakakita
  • Organizer: Conference on Mesoscale Convective Systems and High-Impact Weather in East Asia (ICMCS-XII)
  • Int'l Joint Research
• [Presentation] Structure of outflow-layer clouds of Typhoon Chaba (2016) observed by a Ka-band cloud radar (2017)
  • Author(s): Ohigashi, T., K. Tsuboki, H. Minda, M. Kyushima, H. Yamada, and H. Iwai
  • Organizer: 2017 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] CPSゾンデを用いた雲粒子観測と航空機観測への適用可能性 (2016)
  • Author(s): 篠田太郎・大東忠保・坪木和久
  • Organizer: 「航空機観測による気候・地球システム科学研究の推進」研究集会
  • Place of Presentation: 名古屋大学環境総合館
  • Year and Date: 2016-09-15
• [Presentation] 一層の混相域をもつ北極域混相雲とその環境場の鉛直プロファイル (2016)
  • Author(s): 大東忠保・P. Kollias・W. Szyrmer
  • Organizer: 日本気象学会2016年度春季大会
  • Place of Presentation: 国立オリンピック記念青少年総合センター(東京)
  • Year and Date: 2016-05-18
• [Presentation] 一層の混相域をもつ北極域混相雲とその環境場の鉛直プロファイル (2016)
  • Author(s): 大東忠保・P. Kollias・W. Szyrmer
  • Organizer: 日本気象学会2016年度春季大会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
  • Year and Date: 2016-05-18
• [Presentation] Microphysical structures in the typhoon outflow layer observed by hydrometeor videosonde (2016)
  • Author(s): Suzuki, Y., T. Ohigashi, K. Tsuboki, K. Nakagawa, and H. Yamada
  • Organizer: International Conference on Mesoscale Convective System and High Impact Weather (ICMCS-XI)
  • Place of Presentation: 韓国プサン
  • Year and Date: 2016-04-25
  • Int'l Joint Research
• [Presentation] Early detection of isolated cumulonimbus clouds in summer using data obtained by a Ka-band radar and Geostationary Meteorological Satellites (Himawari-8) (2016)
  • Author(s): Shinoda, T., T. Hikida, T. Ohigashi, T. Kouketsu, M. Kato, and K. Tsuboki
  • Organizer: International Conference on Mesoscale Convective System and High Impact Weather (ICMCS-XI)
  • Place of Presentation: 韓国プサン
  • Year and Date: 2016-04-25
  • Int'l Joint Research
• [Presentation] Precipitation properties of Arctic single-layer mixed-phase clouds (2015)
  • Author(s): Ohigashi, T., P. Kollias, and W. Szyrmer,
  • Organizer: 2015 American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Precipitation properties of single-layer mixed-phase clouds in Barrow, Alaska (2015)
  • Author(s): Ohigashi, T., P. Kollias, and W. Szyrmer
  • Organizer: The Sixth Symposium on Polar Science
  • Place of Presentation: 国立極地研究所
  • Year and Date: 2015-11-16
• [Presentation] 一層の混相域をもつ北極域混相雲の降水の特徴 (2015)
  • Author(s): 大東忠保・P. Kollias・W. Szyrmer
  • Organizer: 日本気象学会2015年度秋季大会
  • Place of Presentation: 京都テルサ
  • Year and Date: 2015-10-28