globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.01.023
论文题名:
Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America
作者: Waldmann N.; Borromei A.M.; Recasens C.; Olivera D.; Martínez M.A.; Maidana N.I.; Ariztegui D.; Austin J.A.; Anselmetti F.S.; Moy C.M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 399
起始页码: 294
结束页码: 309
语种: 英语
英文关键词: Lacustrine sediments ; Limnogeology ; Multi-proxy analyses ; Paleoenvironment and Paleoclimate reconstruction ; Palynology ; Southern Hemisphere Westerlies
英文摘要: This study presents new paleoenvironmental data obtained from sedimentary cores from Lago Fagnano, an elongated lake located at 54°S in southernmost South America. Data from palynomorphs (pollen, spores and algae) and associated palynofacies as well as from diatom taxa retrieved from these cores compared with other regional proxies contribute to evaluate the similarities and differences in the climate patterns based on different proxies from southernmost Patagonia. The pollen analysis reveals that a grass steppe environment existed during the early Holocene (11,300-~. 8000. cal. a. BP) followed by a major vegetation change characterized by development of forest-steppe ecotone communities between ~. 8000 and ~. 6500. cal. a. BP, under more humid conditions. Between ~. 6500 and ~. 4000. cal. a. BP, expansion and colonization by Nothofagus forests reflect an increase in effective moisture levels, while openness in the forest communities characterizes the region after ~. 1100. cal. a. BP. The palynological organic matter combined with the algal content reflects hydrological changes occurring in the lake and its nutrient status, probably in close relation with past climate oscillations. All these past ecological changes are closely related to oscillations in precipitation and temperature as a response to the variations in the latitudinal position and/or strength of the Southern Westerlies wind belt during the Holocene. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69397
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作者单位: Dr. Moses Strauss Department of Marine Geosciences, Charney School of Marine Sciences, University of Haifa, Mount Carmel, 31905 Haifa, Israel; INGEOSUR CONICET, Departamento de Geología, Universidad Nacional del Sur, B8000ICN Bahía Blanca, Argentina; Section of Earth and Environmental Sciences, University of Geneva, 1205 Geneva, Switzerland; Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, NY, United States; Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina; Institute for Geophysics, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, TX 78758, United States; Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland; Geology Department, University of Otago, 9054 Otago, New Zealand

Recommended Citation:
Waldmann N.,Borromei A.M.,Recasens C.,et al. Integrated reconstruction of Holocene millennial-scale environmental changes in Tierra del Fuego, southernmost South America[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,399
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