The Madden-Julian Oscillation in a warmer world

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题名:	The Madden-Julian Oscillation in a warmer world
作者:	Chang, Chiung-Wen June Tseng, Wan-Ling Hsu, Huang-Hsiung Keenlyside, Noel Tsuang, Ben-Jei
贡献者:	Dept Atmospher Sci
关键词:	Madden-Julian Oscillation climate change
日期:	2015-07
上传时间:	2015-10-20 16:17:10 (UTC+8)
摘要:	Global warming's impact on the Madden-Julian Oscillation (MJO) is assessed using one of the few models capable in reproducing its key features. In a warmer climate predicted for the end of the century, the MJO increases in amplitude (by similar to 30%) and frequency, showing a more circumglobal propagation tendency. The MJO spatial extent becomes enhanced, deeper, and more zonally extended but meridionally confined. A stronger vertical tilting structure in diabatic heating, moisture, and convergence fields is seen. Our findings indicate that these changes result from an intensification of the frictional wave-conditional instability of the second kind mechanism via the coupling of dynamical and thermodynamic response to the warming. The warming and moistening of the mean state contribute to the enhanced deep convective heating, driving a stronger-forced Kelvin wave-like perturbation. This reinforces the frictional low-level convergence, leading to larger shallow convective heating and therefore to a faster development and enhancement of the deep convection in the MJO.
關聯:	GEOPHYSICAL RESEARCH LETTERS 卷: 42 期: 14 頁碼: 6034-6042
显示于类别:	[大氣系所] 期刊論文

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