globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.07.019
论文题名:
A molecular isotope record of climate variability and vegetation response in southwestern North America during mid-Pleistocene glacial/interglacial cycles
作者: Contreras S.; Werne J.P.; Brown E.T.; Anderson R.S.; Fawcett P.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 459
起始页码: 338
结束页码: 347
语种: 英语
英文关键词: C3 vs. C4 vegetation ; Carbon stable isotopes ; Climate change ; Interglacial ; Leaf waxes
英文摘要: Climate variability during Pleistocene glacial/interglacial transitions is well documented in marine and ice-sheet isotopic records, but terrestrial records showing the continental response to these transitions are scarce, especially for earlier in the Pleistocene. Cyclic intervals of warm interglacial and cold glacial conditions preserved in terrestrial records such as lake sediments provide opportunities to probe the biosphere's response to climate change. In this study, we track climate and plant type changes, specifically the presence of C3 and C4 plants, using the abundance and δ13C signatures of leaf waxes in paleolacustrine sediments from Valles Caldera in New Mexico. Through these changes, we assess the response of vegetation to climate variability in southwestern North America through two mid-Pleistocene glacial/interglacial transitions (Marine Isotope Stage [MIS] 14/13 and 12/11). Leaf wax data show that the C3 forest taxa were dominant through the entire record whereas C4 plants, better adapted to warm conditions and competitive under water stress, are favored during warming and extended arid periods during interglacials. The δ13C signature in leaf wax n-alkanes suggests that C4 plants persisted in the watershed throughout the interglacials and that some summer rainfall (which is required to support C4 grasses) was maintained even during prolonged dry periods. The abundance and carbon isotope composition of leaf waxes together with new MBT/CBT (methylation index of branched tetraethers/cyclization index of branched tetraethers) temperature data confirm warmer and more arid conditions during MIS 13 than during MIS 11, in spite of relatively low greenhouse gas concentrations during MIS 13. This suggests that variations in incoming solar radiation have played a major role in regulating the surface temperature, regional hydrological systems and vegetation in southwestern North America, likely through changes in the North American Monsoon coupled with variations in the location of the mid-latitude westerlies. © 2016 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/68280
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作者单位: Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, PA, United States; Large Lakes Observatory and Department of Geological Sciences, University of Minnesota Duluth, Duluth, MN, United States; Environmental Programs, School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, United States; Department of Earth & Planetary Sciences, University of New Mexico, Albuquerque, NM, United States

Recommended Citation:
Contreras S.,Werne J.P.,Brown E.T.,et al. A molecular isotope record of climate variability and vegetation response in southwestern North America during mid-Pleistocene glacial/interglacial cycles[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,459
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