气候变化领域集成服务门户(CCPortal): Late Holocene dynamics of the south American summer monsoon: New insights from the Andes of northern Chile (21°S)

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DOI	10.1016/j.quascirev.2020.106533
	Late Holocene dynamics of the south American summer monsoon: New insights from the Andes of northern Chile (21°S)
	Jara I.A.; Maldonado A.; Eugenia de Porras M.
发表日期	2020
ISSN	0277-3791
卷号	246
英文摘要	The South American summer monsoon (SASM) is the most important climate system of tropical South America, transporting moisture from the tropical Atlantic Ocean to the core of the continent during the austral summer. Recent paleoclimate studies suggest that past variability of the SASM has been more heterogenous in space and time than previously thought, implying that different atmospheric drivers controlled its long-term evolution. Unfortunately, past SASM reconstructions are largely limited to the last 2000 years and mainly focused on the core of the monsoon domain where precipitation does not fall exclusively during the monsoon season, thereby limiting our understanding of its long-term changes, drivers and mechanisms. Here we present a new 4000-year SASM precipitation reconstruction based on a high-resolution pollen sequence from a mountain lake in the dry Andes of northern Chile (21°S). We provide evidence for two centennial-scale intervals of enhanced SASM precipitation between 4000–3400 and 2300-1900 cal yr BP. These intervals are replicated in records from the southern portion of the central Andes (>18°S) but not clearly detected further north, suggesting the existence of a monsoon dynamics largely decoupled from latitudinal shifts of the Intertropical Convergence Zone. A comparison with precipitation reconstructions from the entire SASM domain and modern climate datasets suggests a teleconnection with the Southern Hemisphere circulation through the intensification of the South Atlantic Convergence Zone and/or the intrusion of extra-tropical Atlantic moisture. Our results highlight that significant spatial and temporal variability of the SASM occurred during the most recent millennia, and therefore social and environmental forecast should consider that similar variations will likely occur in the future. © 2020 Elsevier Ltd
语种	英语
scopus关键词	Long Term Evolution (LTE); Moisture; Tropics; Intertropical convergence zone; Paleoclimate studies; Precipitation reconstruction; Social and environmental; South atlantic convergence zones; Southern hemisphere circulation; Spatial and temporal variability; Tropical atlantic; Atmospheric thermodynamics; historical record; Holocene; intertropical convergence zone; long-term change; moisture transfer; monsoon; paleoclimate; reconstruction; summer; Andes; Atlantic Ocean; Atlantic Ocean (South); Atlantic Ocean (Tropical); Chile
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151319
作者单位	Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Raúl Bitrán 1305, La Serena, Chile; Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena, Raúl Bitrán 1305, La Serena, Chile; Departamento de Biología Marina, Universidad Católica del Norte, Larrondo, Coquimbo, 1281, Chile; Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA) – CCT Mendoza CONICET. Av. Ruiz Leal s/n, Mendoza, Argentina
推荐引用方式 GB/T 7714	Jara I.A.,Maldonado A.,Eugenia de Porras M.. Late Holocene dynamics of the south American summer monsoon: New insights from the Andes of northern Chile (21°S)[J],2020,246.
APA	Jara I.A.,Maldonado A.,&Eugenia de Porras M..(2020).Late Holocene dynamics of the south American summer monsoon: New insights from the Andes of northern Chile (21°S).Quaternary Science Reviews,246.
MLA	Jara I.A.,et al."Late Holocene dynamics of the south American summer monsoon: New insights from the Andes of northern Chile (21°S)".Quaternary Science Reviews 246(2020).