Vertical cloud properties in the tropical western Pacific Ocean: Validation of the CCSR/NIES/FRCGC GCM by shipborne radar and lidar

Hajime Okamoto, Tomoaki Nishizawa, Toshihiko Takemura, Kaori Sato, Hiroshi Kumagai, Yuichi Ohno, Nobuo Sugimoto, Atsushi Shimizu, Ichiro Matsui, Teruyuki Nakajima

研究成果: ジャーナルへの寄稿記事

31 引用 (Scopus)

抄録

This study examined the vertical cloud structure over the tropical western Pacific Ocean using 95-GHz radar and lidar data observed from September to December 2001 during the MR01-K05 cruise of the research vessel Mirai. The cloud vertical structure was homogeneous between 6 and 10 km, and the maximum cloud occurrence was 20% and located at 12 km. The mean precipitation occurrence was 11.5% at 1 km. The cloud fraction, radar reflectivity factor, and lidar backscattering coefficient were simulated along the Mirai cruise track using the output from the Center for Climate System Research, University of Tokyo; National Institute for Environmental Studies; and Frontier Research Center for Global Change (CCSR/NIES/FRCGC) general circulation model (GCM). The original output showed the maximum cloud fraction at 15 km; however, after considering attenuation and the minimum sensitivity of the radar, the maximum shifted to 12 km. The model overestimated the cloud fraction above 8 km, with the simulated fraction more than twice as large as the observed fraction. The model overpredicted the frequency of deep convection reaching the upper atmosphere above 12 km. Further, it overestimated precipitation frequency. Simulated radar reflectivity was underestimated throughout the entire altitude range, whereas simulated and observed lidar backscattering were in good agreement above 12 km with subgrid-scale treatment. The ice effective radius of 40 μm and ice water content were reasonable in thin clouds, but the radius was underestimated in other regions. The simulated liquid water content was overestimated.

元の言語英語
記事番号D24213
ジャーナルJournal of Geophysical Research Atmospheres
113
発行部数24
DOI
出版物ステータス出版済み - 12 27 2008

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lidar
General Circulation Models
Pacific Ocean
radar
Optical radar
optical radar
general circulation model
Radar
ocean
ice
water content
university research
Ice
Backscattering
reflectivity
Water content
moisture content
global change
backscattering
occurrences

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

これを引用

Vertical cloud properties in the tropical western Pacific Ocean : Validation of the CCSR/NIES/FRCGC GCM by shipborne radar and lidar. / Okamoto, Hajime; Nishizawa, Tomoaki; Takemura, Toshihiko; Sato, Kaori; Kumagai, Hiroshi; Ohno, Yuichi; Sugimoto, Nobuo; Shimizu, Atsushi; Matsui, Ichiro; Nakajima, Teruyuki.

:: Journal of Geophysical Research Atmospheres, 巻 113, 番号 24, D24213, 27.12.2008.

研究成果: ジャーナルへの寄稿記事

Okamoto, Hajime ; Nishizawa, Tomoaki ; Takemura, Toshihiko ; Sato, Kaori ; Kumagai, Hiroshi ; Ohno, Yuichi ; Sugimoto, Nobuo ; Shimizu, Atsushi ; Matsui, Ichiro ; Nakajima, Teruyuki. / Vertical cloud properties in the tropical western Pacific Ocean : Validation of the CCSR/NIES/FRCGC GCM by shipborne radar and lidar. :: Journal of Geophysical Research Atmospheres. 2008 ; 巻 113, 番号 24.
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abstract = "This study examined the vertical cloud structure over the tropical western Pacific Ocean using 95-GHz radar and lidar data observed from September to December 2001 during the MR01-K05 cruise of the research vessel Mirai. The cloud vertical structure was homogeneous between 6 and 10 km, and the maximum cloud occurrence was 20{\%} and located at 12 km. The mean precipitation occurrence was 11.5{\%} at 1 km. The cloud fraction, radar reflectivity factor, and lidar backscattering coefficient were simulated along the Mirai cruise track using the output from the Center for Climate System Research, University of Tokyo; National Institute for Environmental Studies; and Frontier Research Center for Global Change (CCSR/NIES/FRCGC) general circulation model (GCM). The original output showed the maximum cloud fraction at 15 km; however, after considering attenuation and the minimum sensitivity of the radar, the maximum shifted to 12 km. The model overestimated the cloud fraction above 8 km, with the simulated fraction more than twice as large as the observed fraction. The model overpredicted the frequency of deep convection reaching the upper atmosphere above 12 km. Further, it overestimated precipitation frequency. Simulated radar reflectivity was underestimated throughout the entire altitude range, whereas simulated and observed lidar backscattering were in good agreement above 12 km with subgrid-scale treatment. The ice effective radius of 40 μm and ice water content were reasonable in thin clouds, but the radius was underestimated in other regions. The simulated liquid water content was overestimated.",
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AU - Takemura, Toshihiko

AU - Sato, Kaori

AU - Kumagai, Hiroshi

AU - Ohno, Yuichi

AU - Sugimoto, Nobuo

AU - Shimizu, Atsushi

AU - Matsui, Ichiro

AU - Nakajima, Teruyuki

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