| Preliminary Evaluation of a Revised Zhang-McFarlane Convection Scheme Using the NCAR CCM3 GCM |
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| 作者姓名： | Guang J. Zhang Guo Mingming |
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| 作者单位： | Guang J. Zhang Center for Atmospheric Sciences，Scripps Institution of Oceanography，La Jolla，California 92093-0221，USA Guo Mingming University of Science and Technology of China，Hefei 230026 |
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| 基金项目： | This research was supported by the Institute of Geophysics and Planetary Physics of University of
California and the Los Alamos |
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| 摘 要： | l. IntroductiOnThe parameterizat1on of atmospheric convection is one of the most challenging issues inglobal climate modeling. Since convection interacts strongly with clouds and the large--scalecirculation, its representation in GCMs has a tremendous impact on the slmulation of theglobal climate and its variations. For example, in the National Center for Atmospheric Re-search (NCAR) Community Climate Model Version 2 (CCM2), excessive surface 1atent heatflux in the tropics was simulate…
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Preliminary Evaluation of a Revised Zhang-McFarlane Convection Scheme Using the NCAR CCM3 GCM |
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| Guang J. Zhang,Guo Mingming.Preliminary Evaluation of a Revised Zhang-McFarlane Convection Scheme Using the NCAR CCM3 GCM[J].Advances in Atmospheric Sciences,2001,18(5):710-717. |
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| Authors: | Guang J Zhang and Guo Mingming |
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| Institution: | Center for Atmospheric Sciences, Scripps Institution of Oceanography, La Jolla, California 92093-0221, U S A,University of Science and Technology of China, Hefei 230026 |
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| Abstract: | This study investigates the interaction between convection, clouds, and the large-scale circulation. By examining the sensitivity of the large-scale fields to a modification of the convective parameterization scheme in the NCAR CCM3, we show that the convective parameterization has a strong impact on the tem poral characteristics of the large-scale circulation and clouds. When Convective Available Potential Energy (CAPE) in the atmosphere is used to close the convective parameterization, the simulated convection is con tinuous, and lacks the observed intermittence. When the CAPE change due to the large-scale forcing in the free troposphere is used, the simulated temporal behavior of convection is in much better agreement with the observations. We attribute this improvement to the enhanced coupling between convection and the large-scale forcing in the convective parameterization. |
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| Keywords: | Convective parameterization CCM3 GCM |
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