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

Research output: Contribution to journalArticlepeer-review

23 Citations (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.

Original languageEnglish
Article numberD03203
JournalJournal of Geophysical Research Atmospheres
Issue number3
Publication statusPublished - Feb 16 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology


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