globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.028
Scopus记录号: 2-s2.0-85026731390
论文题名:
Long-term vegetation, climate and ocean dynamics inferred from a 73,500 years old marine sediment core (GeoB2107-3) off southern Brazil
作者: Gu F.; Zonneveld K.A.F.; Chiessi C.M.; Arz H.W.; Pätzold J.; Behling H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 172
起始页码: 55
结束页码: 71
语种: 英语
英文关键词: Dinoflagellate cysts ; Environmental changes ; Late Quaternary ; Pollen ; South Atlantic ; Southern Brazil ; Spores
Scopus关键词: Forestry ; Nutrients ; Salinity measurement ; Sea level ; Submarine geology ; Vegetation ; Dinoflagellate cysts ; Environmental change ; Late quaternary ; Pollen ; South Atlantic ; Southern Brazil ; Spores ; Glacial geology ; Araucaria ; Dinophyceae ; Nothofagus
英文摘要: Long-term changes in vegetation and climate of southern Brazil, as well as ocean dynamics of the adjacent South Atlantic, were studied by analyses of pollen, spores and organic-walled dinoflagellate cysts (dinocysts) in marine sediment core GeoB2107-3 collected offshore southern Brazil covering the last 73.5 cal kyr BP. The pollen record indicates that grasslands were much more frequent in the landscapes of southern Brazil during the last glacial period if compared to the late Holocene, reflecting relatively colder and/or less humid climatic conditions. Patches of forest occurred in the lowlands and probably also on the exposed continental shelf that was mainly covered by salt marshes. Interestingly, drought-susceptible Araucaria trees were frequent in the highlands (with a similar abundance as during the late Holocene) until 65 cal kyr BP, but were rare during the following glacial period. Atlantic rainforest was present in the northern lowlands of southern Brazil during the recorded last glacial period, but was strongly reduced from 38.5 until 13.0 cal kyr BP. The reduction was probably controlled by colder and/or less humid climatic conditions. Atlantic rainforest expanded to the south since the Lateglacial period, while Araucaria forests advanced in the highlands only during the late Holocene. Dinocysts data indicate that the Brazil Current (BC) with its warm, salty and nutrient-poor waters influenced the study area throughout the investigated period. However, variations in the proportion of dinocyst taxa indicating an eutrophic environment reflect the input of nutrients transported mainly by the Brazilian Coastal Current (BCC) and partly discharged by the Rio Itajaí (the major river closest to the core site). This was strongly related to changes in sea level. A stronger influence of the BCC with nutrient rich waters occurred during Marine Isotope Stage (MIS) 4 and in particular during the late MIS 3 and MIS 2 under low sea level. Evidence of Nothofagus pollen grains from the southern Andes during late MIS 3 and MIS 2 suggests an efficient transport by the southern westerlies and Argentinean rivers, then by the Malvinas Current and finally by the BCC to the study site. Major changes in the pollen/spore and dinocyst assemblages occur with similar pacing, indicating strongly interlinked continental and marine environmental changes. Proxy comparisons suggest that the changes were driven by similar overarching factors, of which the most important was orbital obliquity. © 2017 Elsevier Ltd
资助项目: We thank Henry Hooghiemstra and an anonymous Reviewer for the constructive comments that greatly improved the manuscript. The sample material has been provided by the GeoB Core Repository at the MARUM - Center for Marine Environmental Sciences, University of Bremen, Germany. We thank Vera Bender for her help sampling the core. The data reported in this paper are archived in Pangaea (www.pangaea.de). Anastasia Poliakova is thanked with the support of dinocyst identification and interpretation. Fabienne Marret is thanked for comments on the ecological distribution of dinocysts. The financial support for this study is given to the first author from China Scholarship Council (CSC). Cristiano M. Chiessi acknowledges the financial support from FAPESP (grants 2012/17517-3 and 2013/50297-0), CAPES (grants 1976/2014 and 564/2015) and CNPq (302607/2016-1 and 422255/2016-5). We thank the captain and crew of RV Meteor for the successful recovery of the sediment core and the Gary Comer science and education foundation (GCSEF) that funded the thesis of Gerrit Heil.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59121
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作者单位: University of Goettingen, Department of Palynology and Climate Dynamics, Untere Karspüle 2, Göttingen, Germany; University of Bremen, MARUM - Center for Marine Environmental Sciences, Leobener Str. 8, Bremen, Germany; University of São Paulo, School of Arts, Sciences and Humanities, Rua Arlindo Bettio, 1000, São Paulo, SP, Brazil; Leibniz Institute for Baltic Sea Research Warnemünde (IOW), Marine Geology Department, Seestraße 15, Rostock-Warnemünde, Germany

Recommended Citation:
Gu F.,Zonneveld K.A.F.,Chiessi C.M.,et al. Long-term vegetation, climate and ocean dynamics inferred from a 73,500 years old marine sediment core (GeoB2107-3) off southern Brazil[J]. Quaternary Science Reviews,2017-01-01,172
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