Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD031015 |
The Convection Connection: How Ocean Feedbacks Affect Tropical Mean Moisture and MJO Propagation | |
DeMott, Charlotte A.1; Klingaman, Nicholas P.2; Tseng, Wan-Ling3; Burt, Melissa A.1; Gao, Yingxia4,5; Randall, David A.1 | |
2019-11-26 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:22页码:11910-11931 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England; Taiwan; Peoples R China |
英文摘要 | The response of the Madden-Julian oscillation (MJO) to ocean feedbacks is studied with coupled and uncoupled simulations of four general circulation models (GCMs). Monthly mean sea surface temperature (SST) from each coupled model is prescribed to its respective uncoupled simulation, to ensure identical SST mean-state and low-frequency variability between simulation pairs. Consistent with previous studies, coupling improves each model's ability to propagate MJO convection beyond the Maritime Continent. Analysis of the MJO moist static energy budget reveals that improved MJO eastward propagation in all four coupled models arises from enhanced meridional advection of column water vapor (CWV). Despite the identical mean-state SST in each coupled and uncoupled simulation pair, coupling increases mean-state CWV near the equator, sharpening equatorward moisture gradients and enhancing meridional moisture advection and MJO propagation. CWV composites during MJO and non-MJO periods demonstrate that the MJO itself does not cause enhanced moisture gradients. Instead, analysis of low-level subgrid-scale moistening conditioned by rainfall rate (R) and SST anomaly reveals that coupling enhances low-level convective moistening for R> 5 mm day(-1); this enhancement is most prominent near the equator. The low-level moistening process varies among the four models, which we interpret in terms of their ocean model configurations, cumulus parameterizations, and sensitivities of convection to column relative humidity. |
英文关键词 | Madden-Julian oscillation ocean feedbacks convection tropical climate |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000498562300001 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; MODULATED SURFACE FLUXES ; STATIC ENERGY BUDGET ; INTRASEASONAL VARIABILITY ; EASTWARD PROPAGATION ; INDIAN-OCEAN ; MODEL ; ATMOSPHERE ; IMPACT ; HEAT |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/225808 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA; 2.Univ Reading, Natl Ctr Atmospher Sci, Reading, Berks, England; 3.Acad Sinica, Res Ctr Environm Changes, Taipei, Taiwan; 4.Nanjing Univ Informat Sci & Technol, Minist Educ, Int Lab Climate & Environm Change, Nanjing, Jiangsu, Peoples R China; 5.Nanjing Univ Informat Sci & Technol, Minist Educ, Key Lab Meteorol Disaster, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | DeMott, Charlotte A.,Klingaman, Nicholas P.,Tseng, Wan-Ling,et al. The Convection Connection: How Ocean Feedbacks Affect Tropical Mean Moisture and MJO Propagation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(22):11910-11931. |
APA | DeMott, Charlotte A.,Klingaman, Nicholas P.,Tseng, Wan-Ling,Burt, Melissa A.,Gao, Yingxia,&Randall, David A..(2019).The Convection Connection: How Ocean Feedbacks Affect Tropical Mean Moisture and MJO Propagation.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(22),11910-11931. |
MLA | DeMott, Charlotte A.,et al."The Convection Connection: How Ocean Feedbacks Affect Tropical Mean Moisture and MJO Propagation".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.22(2019):11910-11931. |
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