Impacts of cumulus momentum transport on MJO simulation |
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Authors: | Jian Ling Chongyin Li Xiaolong Jia |
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Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, Graduate University of the Chinese Academy of Sciences, Beijing 100049,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 and National Climate Center, Beijing 100081 |
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Abstract: | Vertical cumulus momentum transport is an important physical process in the tropical atmosphere and plays
a key role in the evolution of the tropical atmospheric system. This paper focuses on the impact of the vertical
cumulus momentum transport on Madden-Julian Oscillation (MJO) simulation in two global climate models (GCMs). The
Tiedtke cumulus parameterization scheme is applied to both GCMs CAM2 and Spectral Atmospheric general circulation
Model of LASG/IAP (SAMIL)]. It is found that the MJO simulation
ability might be influenced by the vertical cumulus momentum transport through the cumulus parameterization scheme.
However, the use of vertical momentum transport in different models provides different results. In order to improve
model's MJO simulation ability, we must introduce vertical cumulus momentum transport in a more reasonable way into
models. Furthermore, the coherence of the parameterization and the underlying model also need to be considered. |
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Keywords: | Madden Julian Oscillation vertical cumulus momentum transport propagation characteristics |
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