气候变化领域集成服务门户(CCPortal): Centennial-scale precipitation anomalies in the southern Altiplano (18° S) suggest an extratropical driver for the South American summer monsoon during the late Holocene

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DOI	10.5194/cp-15-1845-2019
	Centennial-scale precipitation anomalies in the southern Altiplano (18° S) suggest an extratropical driver for the South American summer monsoon during the late Holocene
	A. Jara I.; Maldonado A.; González L.; Hernández A.; Sáez A.; Giralt S.; Bao R.; Valero-Garcés B.
发表日期	2019
ISSN	18149324
起始页码	1845
结束页码	1859
卷号	15 期号:5
英文摘要	Modern precipitation anomalies in the Altiplano, South America, are closely linked to the strength of the South American summer monsoon (SASM), which is influenced by large-scale climate features sourced in the tropics such as the Intertropical Convergence Zone (ITCZ) and El Niño-Southern Oscillation (ENSO). However, the timing, direction, and spatial extent of precipitation changes prior to the instrumental period are still largely unknown, preventing a better understanding of the long-term drivers of the SASM and their effects over the Altiplano. Here we present a detailed pollen reconstruction from a sedimentary sequence covering the period between 4500 and 1000 cal yr BP in Lago Chungará (18ĝ S; 4570 m a.s.l.), a high-elevation lake on the southwestern margin of the Altiplano where precipitation is delivered almost exclusively during the mature phase of the SASM over the austral summer. We distinguish three well-defined centennial-scale anomalies, with dry conditions between 4100-3300 and 1600-1000 cal yr BP and a conspicuous humid interval between 2400 and 1600 cal yr BP, which resulted from the weakening and strengthening of the SASM, respectively. Comparisons with other climate reconstructions from the Altiplano, the Atacama Desert, the tropical Andes, and the southwestern Atlantic coast reveal that - unlike modern climatological controls - past precipitation anomalies at Lago Chungará were largely decoupled from north-south shifts in the ITCZ and ENSO. A regionally coherent pattern of centennial-scale SASM variations and a significant latitudinal gradient in precipitation responses suggest the contribution of an extratropical moisture source for the SASM, with significant effects on precipitation variability in the southern Altiplano. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	El Nino-Southern Oscillation; Holocene; intertropical convergence zone; latitudinal gradient; moisture content; monsoon; pollen; precipitation assessment; proxy climate record; sedimentary sequence; sequence stratigraphy; Altiplano; Andes; Atacama Desert; Chile; South America
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146871
作者单位	Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Colina Del Pino, La Serena, Chile; Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de la Serena, La Serena, Chile; Departamento de Biología Marina, Universidad Católica Del Norte, Larrondo 1281, Coquimbo, Chile; Municipalidad de San Pedro de Atacama, Gustavo Padre Le Paige 328, San Pedro de Atacama, Chile; Instituto Ciencias de la Tierra Jaume Almera-CSIC, Barcelona, Spain; Departament de Dinàmica de la Terra i de l'Oceà, Universitat de Barcelona, Spain; Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, A Coruña, Spain; Instituto Pirenaico de Ecología - CSIC, Zaragoza, Spain; Laboratorio Internacional de Cambio Global, CSIC-PUC-UFRJ, Zaragoza, Spain
推荐引用方式 GB/T 7714	A. Jara I.,Maldonado A.,González L.,et al. Centennial-scale precipitation anomalies in the southern Altiplano (18° S) suggest an extratropical driver for the South American summer monsoon during the late Holocene[J],2019,15(5).
APA	A. Jara I..,Maldonado A..,González L..,Hernández A..,Sáez A..,...&Valero-Garcés B..(2019).Centennial-scale precipitation anomalies in the southern Altiplano (18° S) suggest an extratropical driver for the South American summer monsoon during the late Holocene.Climate of the Past,15(5).
MLA	A. Jara I.,et al."Centennial-scale precipitation anomalies in the southern Altiplano (18° S) suggest an extratropical driver for the South American summer monsoon during the late Holocene".Climate of the Past 15.5(2019).