Vertical cloud structure observed from shipborne radar and lidar: Midlatitude case study during the MR01/K02 cruise of the research vessel Mirai

Hajime Okamoto, Tomoaki Nishizawa, Toshihiko Takemura, Hiroshi Kumagai, Hiroshi Kuroiwa, Nobuo Sugimoto, Ichiro Matsui, Atsushi Shimizu, Seita Emori, Akihide Kamei, Teruyuki Nakajima

    研究成果: Contribution to journalArticle査読

    50 被引用数 (Scopus)

    抄録

    We observed the vertical distribution of clouds over the Pacific Ocean near Japan in May 2001 using lidar and a 95-GHz radar on the Research Vessel Mirai. Cloud analyses derived from synergy use of radar and lidar observations showed that there were two local maxima of cirrus cloud frequency of occurrence at 7 and 10.5 km and the drizzle frequency of occurrence was about the half compared with that of clouds below 4 km. The number of layers could be also measured using these schemes. Single, double, triple, and quadruple (or more) cloud layers had a 48, 23, 7, and 2% probability of occurrence, respectively. The average number of cloud layers when clouds existed was 1.54. The vertical structure of clouds observed with the radar/lidar system was compared to clouds in the aerosol transport model SPRINTARS, which is based on the CCSR-NIES Atmospheric General Circulation Model. The cloud fraction, radar reflectivity factor, and lidar backscattering coefficient were simulated by the model and compared to those by the observations using height-time cross-sections where the radar sensitivity was taken into account. The overall pattern of cloud fraction was well reproduced, although the model underestimated (overestimated) mean cloud fraction below 8 km (above 8 km). Cloud microphysics in the model could also be validated through comparison of derived model radar and lidar signals in grid mean with observations. The model overestimated ice particle size above 10 km, and simulated particle sizes in water clouds of 10 μm were larger than observed.

    本文言語英語
    論文番号D08216
    ジャーナルJournal of Geophysical Research Atmospheres
    112
    8
    DOI
    出版ステータス出版済み - 4 27 2007

    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

    フィンガープリント

    「Vertical cloud structure observed from shipborne radar and lidar: Midlatitude case study during the MR01/K02 cruise of the research vessel Mirai」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル