IMPACTS OF CUMULUS PARAMETERIZATION AND RESOLUTION ON THE MJO SIMULATION

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. Theretbre,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.

作 者： JIA Xiao-long LI Chong-yin LING Jian   作者單位： JIA Xiao-long(National Climate Center,Beijing,China 100081 China;LASG,Institute of Atmospheric Physics, Chinese Academy of sciences,Beijing,100029 China)

LI Chong-yin(LASG,Institute of Atmospheric Physics, Chinese Academy of sciences,Beijing,100029 China;Institute of Meteorology,PLA University of Science and Technology,Nanjing,211101 China)

LING Jian(LASG,Institute of Atmospheric Physics, Chinese Academy of sciences,Beijing,100029 China) 

刊 名： 熱帶氣象學報(英文版)  英文刊名： JOURNAL OF TROPICAL METEOROLOGY  年，卷(期)： 2009 15(1)  分類號： P458.1.24  關鍵詞： climatology   MJO simulation   GCM   cumulus parameterizations   resolution