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DOI | 10.1002/2017GL075452 |
Joint Modulation of Intraseasonal Rainfall in Tropical Australia by the Madden-Julian Oscillation and El Nino-Southern Oscillation | |
Ghelani, Roohi P. S.1,2; Oliver, Eric C. J.1,2,3; Holbrook, Neil J.1,2; Wheeler, Matthew C.4; Klotzbach, Philip J.5 | |
2017-10-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:20 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; Canada; USA |
英文摘要 | Rainfall in tropical Australia is a critical resource for the agricultural sector. However, its high variability implores improvements in our understanding of its variability. Australian tropical rainfall is influenced by both the Madden-Julian Oscillation (MJO) on intraseasonal time scales and El Nino-Southern Oscillation (ENSO) on interannual time scales. This study examines the joint relationship between the MJO, ENSO, and tropical Australian rainfall variability. We analyze daily precipitation data from stations across tropical Australia during the wet season (November to April). The wet season rainfall response to the MJO is found to be greater during El Nino than La Nina. We demonstrate that this relationship is not due to the statistical relationship between the MJO and ENSO indices but instead due to differences in how the MJO modulates the large-scale circulation during El Nino versus during La Nina. Plain Language Summary This manuscript presents studies of the simultaneous relationship between tropical Australian rainfall variability and two modes of climate variability: the Madden-Julian Oscillation (MJO) and El Nino-Southern Oscillation (ENSO). We analyze daily rainfall at 43 long-record (1942-2011) weather stations across tropical Australia during the wet season (November to April). The MJO is shown to increase rainfall in certain phases (phases 5 and 6) and decrease it in other phases (phases 2 and 3), but more importantly, this signal is enhanced during El Nino as compared to La Nina. This is demonstrated to be due to how the MJO influences atmospheric circulation differently in El Nino versus La Nina wet seasons. These results are significant in demonstrating that the MJO and ENSO do not act independently on rainfall; the state of both climate modes need to be known in order to better predict rainfall variability. Agricultural decisions are highly dependent on knowledge of rainfall variability, from crop management on intraseasonal scales to crop types on interannual scales. Overall, the results of this study provide a better understanding of wet season rainfall and its potential predictability in tropical Australia, a major exporter of agriculture and livestock, with implications for improved agricultural decision-making. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416761600077 |
WOS关键词 | WET SEASON ; VARIABILITY ; ENSO |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/25697 |
专题 | 气候变化 |
作者单位 | 1.Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia; 2.Univ Tasmania, Australian Res Council, Ctr Excellence Climate Syst Sci, Hobart, Tas, Australia; 3.Dalhousie Univ, Dept Oceanog, Halifax, NS, Canada; 4.Bur Meteorol, Melbourne, Vic, Australia; 5.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA |
推荐引用方式 GB/T 7714 | Ghelani, Roohi P. S.,Oliver, Eric C. J.,Holbrook, Neil J.,et al. Joint Modulation of Intraseasonal Rainfall in Tropical Australia by the Madden-Julian Oscillation and El Nino-Southern Oscillation[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(20). |
APA | Ghelani, Roohi P. S.,Oliver, Eric C. J.,Holbrook, Neil J.,Wheeler, Matthew C.,&Klotzbach, Philip J..(2017).Joint Modulation of Intraseasonal Rainfall in Tropical Australia by the Madden-Julian Oscillation and El Nino-Southern Oscillation.GEOPHYSICAL RESEARCH LETTERS,44(20). |
MLA | Ghelani, Roohi P. S.,et al."Joint Modulation of Intraseasonal Rainfall in Tropical Australia by the Madden-Julian Oscillation and El Nino-Southern Oscillation".GEOPHYSICAL RESEARCH LETTERS 44.20(2017). |
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