Arid
DOI10.1016/j.quascirev.2006.12.004
Paleohydrological changes during the last deglaciation in Northern Brazil
Jacob, Jeremy; Huang, Yongsong; Disnar, Jean-Robert; Sifeddine, Abdelfettah; Boussafir, Mohammed; Spadano Albuquerque, Ana Luiza; Turcq, Bruno
通讯作者Jacob, Jeremy
来源期刊QUATERNARY SCIENCE REVIEWS
ISSN0277-3791
出版年2007
卷号26期号:7-8页码:1004-1015
英文摘要

We here report a reconstruction of hydrological balance variations in Northern Brazil for the last 20 ka deduced from the delta D values of aquatic and land plant molecules extracted from the sediment infill of Lake Caco. Our reconstructed precipitation, lake water isotope ratio and evaporation-evapotranspiration isotope effect allows us to obtain an estimate of moisture balance, and, to a lesser extent, precipitation amount and seasonality changes. During the end of the Last Glacial Maximum (LGM, between ca 20 and 17.3 ka), high delta D values and smaller fractionation of leaf waxes indicate an and to semi-arid climate with a long lasting dry season. An abrupt change towards much wetter conditions occurred within ca 500 years from 17.3 to 16.8 ka, as shown by a 50 parts per thousand decrease in D/H ratios and a marked increase in H isotopic fractionation of leaf waxes. This abrupt isotopic change coincides with a major transformation from savanna-dominated vegetation to humid rain forest around the lake, based on pollen data. Comparisons with other paleo-precipitation records from South American sites indicate that Lateglacial humid conditions were controlled by intensification of the ITCZ and/or a southward shift of its mean position across our study site. Our isotope data show only a small rise in aridity during Younger Dryas event (13-11.5 ka). Although the Holocene was not screened in details, D/H ratios of terrestrial and aquatic compounds show near constant offsets, suggesting stable and relatively humid climate conditions during this period. (c) 2007 Elsevier Ltd. All rights reserved.


类型Article
语种英语
国家USA ; France ; Brazil
收录类别SCI-E
WOS记录号WOS:000248732200012
WOS关键词HYDROGEN ISOTOPE RATIOS ; NORTHEASTERN BRAZIL ; N-ALKANES ; TROPICAL ATLANTIC ; GLACIAL MAXIMUM ; AGE CALIBRATION ; CLIMATIC-CHANGE ; ORGANIC-MATTER ; SOUTH-AMERICA ; SCALE CHANGES
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/155807
作者单位(1)Brown Univ, Dept Geol Sci, Providence, RI 02912 USA;(2)Univ Orleans, CNRS, UMR 6113, Inst Sci Terre Orleans, F-45067 Orleans 2, France;(3)IRD Bondy, F-93143 Bondy, France;(4)Univ Fed Fluminense, Dept Geoquim, BR-24020007 Niteroi, RJ, Brazil
推荐引用方式
GB/T 7714
Jacob, Jeremy,Huang, Yongsong,Disnar, Jean-Robert,et al. Paleohydrological changes during the last deglaciation in Northern Brazil[J]. French National Research Institute for Sustainable Development,2007,26(7-8):1004-1015.
APA Jacob, Jeremy.,Huang, Yongsong.,Disnar, Jean-Robert.,Sifeddine, Abdelfettah.,Boussafir, Mohammed.,...&Turcq, Bruno.(2007).Paleohydrological changes during the last deglaciation in Northern Brazil.QUATERNARY SCIENCE REVIEWS,26(7-8),1004-1015.
MLA Jacob, Jeremy,et al."Paleohydrological changes during the last deglaciation in Northern Brazil".QUATERNARY SCIENCE REVIEWS 26.7-8(2007):1004-1015.
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