IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts
Utida, Giselle1; Cruz, Francisco W.1; Santos, Roberto V.2; Sawakuchi, Andre O.1; Wang, Hong3; Pessenda, Luiz C. R.4; Novello, Valdir F.1; Vuille, Mathias5; Strauss, Andre M.6; Borella, Ana Claudia6; Strikis, Nicolas M.7; Guedes, Carlos C. F.8; Dias De Andrade, Fabio Ramos1; Zhang, Haiwei9; Cheng, Hai9,10,11; Edwards, R. Lawrence12
Corresponding AuthorUtida, Giselle(
AbstractChanges 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 (delta C-13), oxygen (delta O-18) and strontium (Sr-87/Sr-86) 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 delta C-13 and delta O-18 and low Sr-87/Sr-86 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. (C) 2020 Elsevier Ltd. All rights reserved.
KeywordStable isotopes ITCZ Speleothems Holocene Northeastern Brazil Archaeology Demographic impacts
Indexed BySCI ; SCI
Funding ProjectFAPESP, Brazil through PIRE NSF-FAPESP[2017/50085-3] ; FAPESP, Brazil through PIRE NSF-FAPESP[2020/02737-4] ; FAPESP, Brazil through PIRE NSF-FAPESP[2016/15807-5] ; FAPESP, Brazil through PIRE NSF-FAPESP[2017/16451-2] ; FAPESP, Brazil through PIRE NSF-FAPESP[2019/12981-2] ; FAPESP, Brazil through PIRE NSF-FAPESP[2019/15914-4] ; NSF, United States[AGS-1303828] ; NSF, United States[OISE-1743738] ; NSF, United States[1103403] ; NSFC, China[NSFC 41888101] ; CNPq, Brazil[423573/2018-7] ; CNPq, Brazil[308769/2018-0] ; CAPES, Brazil[88887.310301/2018-00] ; CAPES
WOS Research AreaPhysical Geography ; Geology
Funding OrganizationFAPESP, Brazil through PIRE NSF-FAPESP ; NSF, United States ; NSFC, China ; CNPq, Brazil ; CAPES, Brazil ; CAPES
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000595946300006
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorUtida, Giselle
Affiliation1.Univ Sao Paulo, Inst Geociencias, Rua Lago 562, BR-05508090 Sao Paulo, SP, Brazil
2.Univ Brasilia, Dept Geol, Brasilia, DF, Brazil
3.Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing, Peoples R China
4.Univ Sao Paulo, 14C Lab, Piracicaba, SP, Brazil
5.SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY USA
6.Univ Sao Paulo, Museu Arqueol & Etnol, Sao Paulo, SP, Brazil
7.Univ Fed Fluminense, Dept Geoquim, Niteroi, RJ, Brazil
8.Univ Fed Parana, Dept Geol, Curitiba, Parana, Brazil
9.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710054, Peoples R China
10.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
11.Inst Karst Geol, Key Lab Karst Dynam, MLR, CAGS, Guilin 541004, Peoples R China
12.Univ Minnesota, Dept Earth Sci, Minneapolis, MN USA
Recommended Citation
GB/T 7714
Utida, Giselle,Cruz, Francisco W.,Santos, Roberto V.,et al. Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts[J]. QUATERNARY SCIENCE REVIEWS,2020,250:18.
APA Utida, Giselle.,Cruz, Francisco W..,Santos, Roberto V..,Sawakuchi, Andre O..,Wang, Hong.,...&Edwards, R. Lawrence.(2020).Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts.QUATERNARY SCIENCE REVIEWS,250,18.
MLA Utida, Giselle,et al."Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts".QUATERNARY SCIENCE REVIEWS 250(2020):18.
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