Effect of Spatial Variation of Convective Adjustment Time on the Madden-Julian Oscillation: A Theoretical Model Analysis

doi:10.3390/atmos8100204

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Effect of Spatial Variation of Convective Adjustment Time on the Madden-Julian Oscillation: A Theoretical Model Analysis
	Wang, Hui1,2 ; Wei, Yuntao 3,4; Liu, Fei 1,2
刊名	ATMOSPHERE
	2017-10-01
卷号	8 期号:10
关键词	Madden-julian Oscillation Convective Adjustment Time Convective Relaxation Frequency Spatial Variation Frictionally Coupled Dynamics Moisture Model
DOI	10.3390/atmos8100204
文献子类	Article
英文摘要	The observed convective adjustment time (CAT) associated with Madden-Julian Oscillation (MJO) precipitation is found to vary significantly in space. Here, we investigate the effect of different spatial distributions of CAT on MJO precipitation based on the frictional coupled dynamics moisture (FCDM) model. The results show that a large value of CAT tends to decrease the frequency and growth rate of eastward-propagating MJO-like mode in the FCDM model, delaying the occurrence of MJO deep convection and slowing down its eastward propagation. A large phase lag between circulation and convection decreases convective available potential energy (CAPE). In the observations, a small background vertical moisture gradient (BVMG) tends to increase the frequency associated with cold sea surface temperature (SST), while a large value of CAT tends to decrease the frequency. Due to their competing effect, the simulated frequency and phase speed remain the same when the convection moves from a warm to a cold SST region. The convection is heavily suppressed over the cold SST region due to the decreasing growth rate of unstable wavenumber-one mode with smaller BVMG and longer CAT. This theoretical finding should improve our understanding of MJO dynamics and simulation.
语种	英语
WOS记录号	WOS:000414847600024
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/143061]
专题	海洋研究所_海洋环流与波动重点实验室
作者单位	1.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, Nanjing 210044, Jiangsu, Peoples R China 2.Nanjing Univ Informat Sci & Technol, Climate Dynam Res Ctr, Nanjing 210044, Jiangsu, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Hui,Wei, Yuntao,Liu, Fei. Effect of Spatial Variation of Convective Adjustment Time on the Madden-Julian Oscillation: A Theoretical Model Analysis[J]. ATMOSPHERE,2017,8(10).
APA	Wang, Hui,Wei, Yuntao,&Liu, Fei.(2017).Effect of Spatial Variation of Convective Adjustment Time on the Madden-Julian Oscillation: A Theoretical Model Analysis.ATMOSPHERE,8(10).
MLA	Wang, Hui,et al."Effect of Spatial Variation of Convective Adjustment Time on the Madden-Julian Oscillation: A Theoretical Model Analysis".ATMOSPHERE 8.10(2017).