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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.4
발행연도
2009.11
수록면
439 - 462 (24page)

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초록· 키워드

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The impacts of implementing state-of-the-art radiation packages on the radiative energy budget and troposphere-stratosphere circulations of a global climate model are investigated. The parameterizations newly incorporated are Chou and Suarez (2002) for solar radiation and Chou et al. (2003) modified by Chou and Lee (2005) for infrared radiation, respectively, while the previous schemes are based on Oh (1989) for both processes. The advanced packages result in increased biases in the clear-sky shortwave fluxes. However, unlike the random errors produced by the previous parameterizations, those biases are systematic and hence understandable to a considerable extent. Updating surface reflectivity and inclusion of aerosol radiative forcings are inferred to be essential to reduce the biases over the global land and the global ocean, respectively. Meanwhile, the clear-sky outgoing longwave radiation biases are generally decreased and change in sign. Again, the biases are explainable and attributed to the temperature biases and weakening of greenhouse effects due to the reduction in the tropospheric water vapor. The implementation rectifies the simulated temperature structures in the upper troposphere and stratosphere, entailing improved zonal wind in terms of the intensity and position of the polar night jet and the subtropical jet, and the separation between these two jet cores. The simulated wintertime stationary waves also show desirable changes. The amplitudes of wave activity are intensified as a result of the realistic southward displacement of the modeled subtropical westerly jets. The vertical and horizontal phase propagations of the longest two zonal waves become comparable to those of the observed. However, in spite of the realistic meridional temperature gradient reproduced in the summer hemispheric stratosphere, the seasonal reversal of the stratospheric zonal wind direction remains unsatisfactory.

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Abstract
1. Introduction
2. Implementation of broadband radiation parameterizations
3. AGCM and numerical simulations
4. Radiation flux
5. Zonal-mean structures
6. Stationary waves
7. Summary and conclusions
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UCI(KEPA) : I410-ECN-0101-2009-453-019158816