Planetary Waves drive South America’s Monsoon rains

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	Planetary Waves drive South America’s Monsoon rains
	admin
	2018-12-20
发布年	2018
语种	英语
国家	德国
领域	资源环境
正文(英文)	12/20/2018 - Monsoon rainfall in South America is to a large extent driven by huge airstreams high up in the atmosphere, a new study finds. Using innovative methods to explore teleconnections between different parts of the world, the scientists found evidence that the so-called Rossby waves – airstreams swinging from the tropics to Antarctica and back while circling the globe – are key for the variability in regional precipitation especially in parts of Brazil and Argentina. This has been assumed before but, to the knowledge of the authors, never been properly conceptualized and detected in actual data. Precipitation patterns in South America. Fig 1 from Gelbrecht et al, 2018 (cutout, refer to the paper for full figure)) “Our findings are of great relevance for some densely populated areas, especially the surroundings of Sao Paulo and Buenos Aires,” says Maximilian Gelbrecht from the Potsdam Institute for Climate Impact Research. “We hope that this can improve weather forecasting which becomes ever more important in times of climate change.” While the study is not about climate impacts, the region has been struck by some severe droughts in the past years which might have a link to global warming. Hence the interest of better understanding rainfall variability. Previous research by other scientists investigated the link between global warming and changes in Rossby wave behavior. “The present study is just another outcome of our complex systems science,” says project lead Jürgen Kurths from PIK. “While our approach is based on high-end mathematics, it yields practical insights into regional rainfall, which really matters to the affected people.” Article: M. Gelbrecht, N. Boers, J. Kurths (2018): Phase coherence between precipitation in South America and Rossby waves. Science Advances 4, eaau3191 [DOI:10.1126/sciadv.aau3191] Weblink to the article: http://advances.sciencemag.org/content/4/12/eaau3191
URL	查看原文
来源平台	Potsdam Institute for Climate Impact Research
文献类型	新闻
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/105155
专题	资源环境科学
推荐引用方式 GB/T 7714	admin. Planetary Waves drive South America’s Monsoon rains. 2018.