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《热带气象学报(英文版)》 2009-01
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IMPACTS OF CUMULUS PARAMETERIZATION AND RESOLUTION ON THE MJO SIMULATION

JIA Xiao-long 1, 2, LI Chong-yin 2, 3, LING Jian 2 (1. National Climate Center, Beijing, China 100081 China; 2. LASG, Institute of Atmospheric Physics, Chinese Academy of sciences, Beijing, 100029 China; 3. Institute of Meteorology, PLA University of Science and Technology, Nanjing, 211101 China)  
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.
【Fund】: National Natural Science Foundation of China (40805027; 40675051)
【CateGory Index】: P426.5
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