IMPACTS OF CUMULUS PARAMETERIZATION AND RESOLUTION ON THE MJO SIMULATION |
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Authors: | JIA Xiao-long LI Chong-yin and LING Jian |
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Institution: | 1. National Climate Center,Beijing,China 100081 China;LASG,Institute of Atmospheric Physics, Chinese Academy of sciences,Beijing,100029 China 2. LASG,Institute of Atmospheric Physics, Chinese Academy of sciences,Beijing,100029 China;Institute of Meteorology,PLA University of Science and Technology,Nanjing,211101 China 3. LASG,Institute of Atmospheric Physics, Chinese Academy of sciences,Beijing,100029 China |
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Abstract: | Madden-Julian Oscillations (MJO) in six integrations using an AGCM with different cumulus
parameterization schemes and resolutions are examined to investigate their impacts on the MJO simulation.
Results suggest that the MJO simulation can be affected by both resolution and cumulus parameterization,
though the latter, which determines the fundamental ability of the AGCM in simulating the MJO and the
characteristics of the simulated MJO, is more crucial than the former. Model resolution can substantially
affect the simulated MJO in certain aspects. Increasing resolution cannot improve the simulated MJO
substantially, but can significantly modulate the detailed character of the simulated MJO; meanwhile, the
impacts of resolution are dependent on the cumulus parameterization, determining the basic features of the
MJO. Changes in the resolution do not alter the nature of the simulated MJO but rather regulate the
simulation itself, which is constrained by cumulus parameterization schemes. Therefore, the vertical
resolution needs to be increased simultaneously. The vertical profile of diabatic heating may be a crucial
factor that is responsible for these different modeling results. To a large extent, it is determined by the
cumulus parameterization scheme used. |
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Keywords: | climatology MJO simulation GCM cumulus parameterizations resolution |
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