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Effect of Spatial Variation of Convective Adjustment Time on the Madden-Julian Oscillation: A Theoretical Model Analysis
Wang, Hui1,2; Wei, Yuntao3,4; Liu, Fei1,2
2017-10-01
发表期刊ATMOSPHERE
卷号8期号:10
文章类型Article
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.
关键词Madden-julian Oscillation Convective Adjustment Time Convective Relaxation Frequency Spatial Variation Frictionally Coupled Dynamics Moisture Model
DOI10.3390/atmos8100204
收录类别SCI
语种英语
WOS记录号WOS:000414847600024
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/143061
专题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
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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).
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