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[B-5.4.2 Evaluation of Feedback Process of Hydrological Circulation in the Atmosphere and Cloud Processes(Final Report)]

[Contact Person]

Yukari N. Takayabu
Senior Researcher
Atmospheric Environment Division
National Institute for Environmental Studies
16-2, Onogawa, Tsukuba 305 Japan
Phone:+81-298-50-2472, Fax:+81-298-51-4732
E-mail:yukari@nies.go.jp

[Total Budget for FY1994-1996]

12,937,000 Yen (FY1996 4,300,000 Yen)

[Abstract]

　In order to clarify the role of cloud feedback in the global climate change, advanced analysis studies utilizing the satellite data were performed. First, 'Semi-random method' for the radiation code was developed to include the effect of finite cloud fraction and implemented to the climate model. Secondly, utilizing the TOGA COARE(Tropical Ocean and Global Atmosphere Coupled Ocean Atmosphere Response Experiment) data, relationship between dynamical atmospheric disturbances and a lifecycle of cloud systems were described in detail. Thirdly, cloud characteristics and its effects were studied by utilizing various satellite data from NOAA/AVHRR(Advanced Very High Resolution Radiometer), ERBE(Earth Radiation Budget Experiment), ISCCP(International Satellite Cloud Climatology Project) and an advanced radiative transfer model. A new algorithm, 'the Normalized Split Window Method, to retrieve the cloud optical properties, was developed and applied to the global data. And cloud radiative forcing for various cloud types was examined utilizing the ISCCP cloud data and advanced radiative transfer model. It was shown that tropical high level clouds play more significant role compared to the mid-high latitude clouds from the viewpoint of the global climate change.

[Key Words]

cloud radiative forcing, cloud optical properties, satellite data, radiative transfer model, organized cumulus convection, normalized split window method