Effects of South China Sea/western North Pacific summer monsoon on tropospheric biennial oscillation (TBO)
Zheng Bin(郑彬)† , Gu De-Jun(谷德军), Lin Ai-Lan(林爱兰), and Li Chun-Hui(李春晖)
Guangzhou Institute of Tropical and Marine Meteorology/the Key Open Laboratory for Tropical Monsoon, China Meteorological Administration, Guangzhou 510080, China
Abstract Several theories have been developed to explain tropical biennial oscillation (TBO), as an air--sea interactive system to impact Asian and global weather and climate, and some models have been established to produce a TBO. A simple 5-box model, with almost all the key processes associated with TBO, can produce a TBO by including air--sea interactions in the monsoon regions. Despite that, the South China Sea/western North Pacific summer monsoon (SCS/WNPSM), a very important monsoon subsystem, is neglected. In this paper, based on the dynamical framework of 5-box model, the term of SCS/WNPSM has been added and a 6-box model has been developed. Comparing the difference of TBO sensibilities with several key parameters, air--sea coupling coefficient $\alpha$, SST-thermocline feedback coefficient $\gamma$ and wind-evaporation feedback coefficient $\lambda$, between the modified model and original model, TBO is more sensible to the parameters in the new model. The results imply that the eastern Pacific and local wind-evaporation play more important roles in the TBO when including SCS/WNPSM.
Received: 06 September 2006
Revised: 19 October 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of
China (Grant No~40505019) and the Open Research Fund of Laboratory of
China Meteorological Administration (Grant No~CMATG2006L03).
Cite this article:
Zheng Bin(郑彬), Gu De-Jun(谷德军), Lin Ai-Lan(林爱兰), and Li Chun-Hui(李春晖) Effects of South China Sea/western North Pacific summer monsoon on tropospheric biennial oscillation (TBO) 2007 Chinese Physics 16 1472
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