气候变化领域集成服务门户(CCPortal): Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts

CCPortal

DOI	10.1016/j.quascirev.2020.106655
	Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts
	Utida G.; Cruz F.W.; Santos R.V.; Sawakuchi A.O.; Wang H.; Pessenda L.C.R.; Novello V.F.; Vuille M.; Strauss A.M.; Borella A.C.; Stríkis N.M.; Guedes C.C.F.; Dias De Andrade F.R.; Zhang H.; Cheng H.; Edwards R.L.
发表日期	2020
ISSN	0277-3791
卷号	250
英文摘要	Changes in insolation driven by precession and obliquity are considered the major driver of tropical precipitation on orbital time scales, and responsible for vegetation and physical landscape changes during the Late Holocene over tropical South America. Here we investigate the environmental changes in the karst region of Chapada do Apodi - Northeastern Brazil (NEB), using a multi-proxy approach including carbon (δ13C), oxygen (δ18O) and strontium (87Sr/86Sr) isotopic analyses on speleothems from different caves, carbonate bedrock, and clastic cave deposits. This approach reveals that the balance between soil formation and erosion and their alternating impact on vegetation and precipitation changes occurred in response to variations in the position and intensity of the Intertropical Convergence Zone (ITCZ) over the region. The high δ13C and δ18O and low 87Sr/86Sr values at 4,200 yrs BP indicate a massive episode of soil erosion, resulting in the exposure of carbonate bedrocks over a large area of the karst terrain. This event marks the beginning of the Meghalayan chronozone, characterized as the aridification of this region, decline in soil production, drying out of underground drainages, and increased dominance of dry-adapted flora species, characteristic of a more open vegetation (caatinga). We investigated if the Holocene climatic changes affected human occupation in the NEB and found that the overall demographic course is virtually identical to the well-established curve characterized by population deflation during Middle Holocene. © 2020 Elsevier Ltd
英文关键词	Archaeology; Demographic impacts; Holocene; ITCZ; Northeastern Brazil; Speleothems; Stable isotopes
语种	英语
scopus关键词	Climate change; Erosion; Landforms; Soils; Strontium compounds; Strontium deposits; Tropics; Vegetation; Carbonate bedrock; Environmental change; Intertropical convergence zone; Isotopic analysis; Northeastern Brazil; Precipitation change; Tropical precipitation; Underground drainage; Environmental impact; aridification; bedrock; climate change; deglaciation; environmental impact; intertropical convergence zone; isotopic analysis; oxygen isotope; precipitation (climatology); soil erosion; soil-vegetation interaction; spatiotemporal analysis; Brazil; Apodi
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/151236
作者单位	Instituto de Geociências, Universidade de São Paulo, Cidade Universitária, Rua do Lago, 562, São Paulo, SP 05508-090, Brazil; Departamento de Geologia, Universidade de Brasília, Brasília, Brazil; Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing, China; Universidade de São Paulo, 14C Laboratory, Piracicaba, SP, Brazil; Department of Atmospheric and Environmental Sciences University at Albany, SUNY, Albany, NY, United States; Museu de Arqueologia e Etnologia, Universidade de São Paulo, São Paulo, Brazil; Departamento de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil; Departamento de Geologia, Universidade Federal do Paraná, Curitiba, Brazil; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710054, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Key Laboratory of Karst Dynamics, MLR, Institute of Karst Geology, CAGS, Guili...
推荐引用方式 GB/T 7714	Utida G.,Cruz F.W.,Santos R.V.,et al. Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts[J],2020,250.
APA	Utida G..,Cruz F.W..,Santos R.V..,Sawakuchi A.O..,Wang H..,...&Edwards R.L..(2020).Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts.Quaternary Science Reviews,250.
MLA	Utida G.,et al."Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts".Quaternary Science Reviews 250(2020).