干旱区生态环境知识资源中心(Arid): Strongest MJO on Record Triggers Extreme Atacama Rainfall and Warmth in Antarctica

Arid

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
通讯作者	Rondanelli, R.
来源期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2019
卷号	46 期号:6 页码:3482-3491
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
类型	Article
语种	英语
国家	Chile ; USA
开放获取类型	hybrid
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
来源机构	Desert Research Institute
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216024
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]. Desert Research Institute,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.