DOI: 10.1007/s00382-014-2315-1
Scopus记录号: 2-s2.0-85028139993
论文题名: Resolving the upper-ocean warm layer improves the simulation of the Madden–Julian oscillation
作者: Tseng W.-L. ; Tsuang B.-J. ; Keenlyside N.S. ; Hsu H.-H. ; Tu C.-Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-05-06 起始页码: 1487
结束页码: 1503
语种: 英语
英文关键词: Coupling
; MJO
; One column ocean model
; Warm layer
英文摘要: Here we show that coupling a high-resolution one-column ocean model to an atmospheric general circulation model dramatically improves simulation of the Madden–Julian oscillation (MJO) to have realistic strength, period, and propagation speed. The mechanism for the simulated MJO involves both frictional wave-convective conditional instability of the second kind (Frictional wave-CISK) and air–sea convective intraseasonal interaction (ASCII). In particular, better resolving the fine structure of upper ocean temperature, especially the warm layer, produces more vigorous atmosphere–ocean interaction and strengthens intraseasonal variations in both SST and atmospheric circulation. This helps organize and strengthen deep convection, inducing a stronger Kelvin-wave like perturbation and frictional near-surface convergence to the east. In addition, the warmer SST ahead of the MJO also acts to destabilize the boundary layer and enhance frictional convergence. These lead to a more realistic eastward-propagating MJO. A suite of sensitivity experiments were performed to show the robustness of the mechanisms and to demonstrate: (1) that mean state differences are not the main contributors to the improved simulation of our coupled model; (2) the role of SST variability in enhancing frictional convergence and intraseasonal variations in precipitation, and (3) that the simulation is significantly degraded when the first ocean model layer is thicker than 10 m. Our coupled model results are consistent with observations and demonstrate a simple but effective means to significantly improve MJO simulation and potentially also forecasts. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54179
Appears in Collections: 过去全球变化的重建
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作者单位: Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department of Environmental Engineering, National Chung-Hsing University, Taichung, Taiwan; Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway
Recommended Citation:
Tseng W.-L.,Tsuang B.-J.,Keenlyside N.S.,et al. Resolving the upper-ocean warm layer improves the simulation of the Madden–Julian oscillation[J]. Climate Dynamics,2015-01-01,44(2017-05-06)