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DOI | 10.1002/2016JD025955 |
Key processes for the eastward propagation of the Madden-Julian Oscillation based on multimodel simulations | |
Jiang, Xianan1,2 | |
2017-01-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | As a prominent climate variability mode with widespread influences on global weather extremes, the Madden-Julian Oscillation (MJO) remains poorly represented in the latest generation of general circulation models (GCMs), with a particular challenge in simulating its eastward propagating convective signals. In this study, by analyzing multimodel simulations from a recent global MJO model evaluation project, an effort is made to identify key processes for the eastward propagation of the MJO through analyses of moisture entropy (ME) processes under a "moisture mode" framework for the MJO. The column-integrated horizontal ME advection is found to play a critical role for the eastward propagation of the MJO in both observations and good MJO models, with a primary contribution through advection of the lower tropospheric seasonal mean ME by the MJO anomalous circulations. By contrast, the horizontal ME advection effect for the eastward propagation is greatly underestimated in poor MJO GCMs, due to model deficiencies in simulating both the seasonal mean ME pattern and MJO circulations, leading to a largely stationary MJO mode in these GCMs. These results thus pinpoint an important guidance toward improved representation of the MJO in climate and weather forecast models. While this study mainly focuses on fundamental physics for the MJO propagation over the Indian Ocean, complex influences by the Maritime Continent on the MJO and also ME processes associated with the MJO over the western Pacific warrant further investigations. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396116900012 |
WOS关键词 | STATIC ENERGY BUDGET ; VERTICAL STRUCTURE ; PHYSICAL PROCESSES ; MOISTURE MODES ; MJO ; CLIMATE ; WEATHER ; PRECIPITATION ; PREDICTION ; TROPICS |
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/33059 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci & Engn, Los Angeles, CA 90095 USA; 2.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Jiang, Xianan. Key processes for the eastward propagation of the Madden-Julian Oscillation based on multimodel simulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(2). |
APA | Jiang, Xianan.(2017).Key processes for the eastward propagation of the Madden-Julian Oscillation based on multimodel simulations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(2). |
MLA | Jiang, Xianan."Key processes for the eastward propagation of the Madden-Julian Oscillation based on multimodel simulations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.2(2017). |
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