95-GHz Doppler radar and lidar synergy for simultaneous ice microphysics and in-cloud vertical air motion retrieval

Kaori Sato, Hajime Okamoto, Masayuki K. Yamamoto, Shoichiro Fukao, Hiroshi Kumagai, Yuichi Ohno, Hiroaki Horie, Makoto Abo

研究成果: Contribution to journalArticle査読

19 被引用数 (Scopus)


We introduce a combined 95-GHz radar multi-parameter (radar reflectivity Ze, Doppler velocity VD, and/or linear depolarization ratio LDR) and lidar backscatter coefficient βbk algorithm for the simultaneous retrieval of ice cloud microphysics and in-cloud vertical air motion Vair within a single radar volume. Unlike earlier methods, our new approach is not limited to a specific temporal or spatial scale of V air, which makes it applicable to the interaction between cloud dynamics and ice cloud microphysics on various scales. Full one-to-one validation of the retrieved Vair was performed, for the first time, by collocated VHF Doppler radar measurement (Equatorial Atmospheric Radar) every 3 min for a cloud observed on 14 November 2005, at Kototabang, West Sumatra, Indonesia. The spatial structure of the retrieved up-/downward Vair in cloud agreed closely with direct measurements, with an average difference of -0.009 ±0.119 ms-1. The frequency distributions for the retrieved and measured Vair also agreed closely, with peaks of similar width observed around 0 ms-1. A large improvement in the microphysical retrieval was achieved due to the accurate estimation of the Ze-weighted particle fall velocity Vtz from VD. The correlation coefficient between ice water content retrieved with the estimated Vair and that retrieved with the Vair measured by the EAR improved to 0.70 from values as low as 0.28 without the V air retrieval.

ジャーナルJournal of Geophysical Research Atmospheres
出版ステータス出版済み - 2 16 2009

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 林業
  • 海洋学
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 古生物学


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