气候变化领域集成服务门户(CCPortal): Six hundred years of South American tree rings reveal an increase in severe hydroclimatic events since mid-20th century

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DOI	10.1073/pnas.2002411117
	Six hundred years of South American tree rings reveal an increase in severe hydroclimatic events since mid-20th century
	Morales M.S.; Cook E.R.; Barichivich J.; Christie D.A.; Villalba R.; LeQuesne C.; Srur A.M.; Eugenia Ferrero M.; González-Reyes Á.; Couvreux F.; Matskovsky V.; Aravena J.C.; Lara A.; Mundo I.A.; Rojas F.; Prieto M.R.; Smerdon J.E.; Bianchi L.O.; Masiokas M.H.; Urrutia-Jalabert R.; Rodriguez-Catón M.; Muñoz A.A.; Rojas-Badilla M.; Alvarez C.; Lopez L.; Luckman B.H.; Lister D.; Harris I.; Jones P.D.; Park Williams A.; Velazquez G.; Aliste D.; Aguilera-Betti I.; Marcotti E.; Flores F.; Muñoz T.; Cuq E.; Boninsegna J.A.
发表日期	2020
ISSN	0027-8424
起始页码	16816
结束页码	16823
卷号	117 期号:29
英文摘要	South American (SA) societies are highly vulnerable to droughts and pluvials, but lack of long-term climate observations severely limits our understanding of the global processes driving climatic variability in the region. The number and quality of SA climate-sensitive tree ring chronologies have significantly increased in recent decades, now providing a robust network of 286 records for characterizing hydroclimate variability since 1400 CE. We combine this network with a self-calibrated Palmer Drought Severity Index (scPDSI) dataset to derive the South American Drought Atlas (SADA) over the continent south of 12°S. The gridded annual reconstruction of austral summer scPDSI is the most spatially complete estimate of SA hydroclimate to date, and well matches past historical dry/wet events. Relating the SADA to the Australia-New Zealand Drought Atlas, sea surface temperatures and atmospheric pressure fields, we determine that the El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) are strongly associated with spatially extended droughts and pluvials over the SADA domain during the past several centuries. SADA also exhibits more extended severe droughts and extreme pluvials since the mid-20th century. Extensive droughts are consistent with the observed 20th-century trend toward positive SAM anomalies concomitant with the weakening of midlatitude Westerlies, while low-level moisture transport intensified by global warming has favored extreme rainfall across the subtropics. The SADA thus provides a long-term context for observed hydroclimatic changes and for 21st-century Intergovernmental Panel on Climate Change (IPCC) projections that suggest SA will experience more frequent/ severe droughts and rainfall events as a consequence of increasing greenhouse gas emissions. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Drought atlas; Extreme hydroclimate events; Palaeoclimate reconstruction; South America hydroclimate; Southern Hemisphere climate modes
语种	英语
scopus关键词	rain; atmospheric pressure; carbon footprint; controlled study; drought; environmental impact; experience; greenhouse effect; hydroclimate; moisture; nonhuman; priority journal; Review; sea surface temperature; seasonal variation; soil moisture; South America; spatiotemporal analysis; tree; tree ring; climate; geographic mapping; greenhouse effect; growth, development and aging; statistical model; tree; Climate; Droughts; Geographic Mapping; Global Warming; Models, Statistical; Rain; South America; Trees
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160256
作者单位	Morales, M.S., Instituto Argentino de Nivología, Glaciología y Cs. Ambientales, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Mendoza, 5500, Argentina, Laboratorio de Dendrocronología, Universidad Continental, Huancayo, 12003, Peru; Cook, E.R., Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964-1000, United States; Barichivich, J., Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre Simon Laplace, CNRS/Commissariat à l'Energie Atomique, Université de Versailles Saint-Quentin-en-Yvelines, Gif sur Yvette, 91191, France, Laboratorio de Dendrocronología y Cambio Global, Instituto de Conservación Biodiversidad y Territorio, Universidad Austral de Chile, Valdivia, 5110566, Chile; Christie, D.A., Laboratorio de Dendrocronología y Cambio Global, Instituto de Conservación Biodiversidad y Territorio, Universidad Austral de Chile, Valdivia, 5110566, Chile, Center for Climate and Resilience Research (CR)2, Santiago, 8370415, Chile; Villalba, R., I...
推荐引用方式 GB/T 7714	Morales M.S.,Cook E.R.,Barichivich J.,et al. Six hundred years of South American tree rings reveal an increase in severe hydroclimatic events since mid-20th century[J],2020,117(29).
APA	Morales M.S..,Cook E.R..,Barichivich J..,Christie D.A..,Villalba R..,...&Boninsegna J.A..(2020).Six hundred years of South American tree rings reveal an increase in severe hydroclimatic events since mid-20th century.Proceedings of the National Academy of Sciences of the United States of America,117(29).
MLA	Morales M.S.,et al."Six hundred years of South American tree rings reveal an increase in severe hydroclimatic events since mid-20th century".Proceedings of the National Academy of Sciences of the United States of America 117.29(2020).