Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL081475 |
Strongest MJO on Record Triggers Extreme Atacama Rainfall and Warmth in Antarctica | |
Rondanelli, R.1,2; Hatchett, B.3; Rutllant, J.1,4; Bozkurt, D.1,2; Garreaud, R.1,2 | |
2019-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:6页码:3482-3491 |
文章类型 | Article |
语种 | 英语 |
国家 | Chile; USA |
英文摘要 | Tropical perturbations have been shown theoretically and observationally to excite long-range atmospheric responses in the form of Rossby wave teleconnections that result from the equator to pole gradient of planetary vorticity. An extreme teleconnection event occurred during March 2015 in the Southeastern Pacific. As a result, extreme high temperatures were observed in Southwestern South America and the Antarctic Peninsula simultaneously with an extreme rainfall and flood event in the hyperarid Atacama desert. We show that the origin of these seemingly disconnected extreme events can be traced to a Rossby wave response to the strongest Madden-Julian Oscillation (MJO) on record in the tropical central Pacific. A barotropic wave number 3 to 4 perturbation with group velocity between 15 and 30 m/s is consistent with the trajectory and timing followed by the upper-level anomalies radiating away from the tropics after the MJO episode. Plain Language Summary Large atmospheric waves can travel from the tropical regions after being excited by deep convective systems over the oceans. Sometimes this tropical rainfall occurs associated to tropical waves that take from 30 to 60 days to travel around the planet, known as the Madden-Julian Oscillations. The strongest of such Madden-Julian wave was observed during March 2015. Here we show that this wave triggered a response that traveled far east and south of the original rainfall heating, producing extreme weather in Antarctica (highest temperature in continental Antarctica observed on record) as well as extreme weather in the Pacific South American coast (major flooding in the Atacama desert). We emphasize that this case illustrates the importance of tropical extremes in setting temperature and precipitation extremes far away from the tropics, including polar regions. This has major consequences for these extreme environments: for the maintenance of the ice shelves in Antarctic Peninsula and for the hyperarid character of the Atacama desert. |
英文关键词 | Rossby waves extremes flooding atmospheric rivers Antarctica climate dynamics |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464650400051 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; MARCH 2015 ; ATMOSPHERIC CIRCULATION ; PRECIPITATION EVENTS ; SOUTHERN-HEMISPHERE ; CUTOFF LOWS ; CHILE ; TEMPERATURE ; CONVECTION |
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/181798 |
专题 | 气候变化 |
作者单位 | 1.Univ Chile, Dept Geophys, Santiago, Chile; 2.Ctr Climate & Resilience Res, Santiago, Chile; 3.Desert Res Inst, Las Vegas, NV USA; 4.Ctr Estudios Zonas Aridas, La Serena, Chile |
推荐引用方式 GB/T 7714 | Rondanelli, R.,Hatchett, B.,Rutllant, J.,et al. Strongest MJO on Record Triggers Extreme Atacama Rainfall and Warmth in Antarctica[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(6):3482-3491. |
APA | Rondanelli, R.,Hatchett, B.,Rutllant, J.,Bozkurt, D.,&Garreaud, R..(2019).Strongest MJO on Record Triggers Extreme Atacama Rainfall and Warmth in Antarctica.GEOPHYSICAL RESEARCH LETTERS,46(6),3482-3491. |
MLA | Rondanelli, R.,et al."Strongest MJO on Record Triggers Extreme Atacama Rainfall and Warmth in Antarctica".GEOPHYSICAL RESEARCH LETTERS 46.6(2019):3482-3491. |
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