Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.palaeo.2016.07.019 |
A molecular isotope record of climate variability and vegetation response in southwestern North America during mid-Pleistocene glacial/interglacial cycles | |
Contreras, Sergio1,2,3; Werne, Josef P.1; Brown, Erik T.2,3; Anderson, R. Scott4; Fawcett, Peter J.5 | |
通讯作者 | Contreras, Sergio |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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ISSN | 0031-0182 |
EISSN | 1872-616X |
出版年 | 2016 |
卷号 | 459页码:338-347 |
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 delta C-13 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 0 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 delta C-13 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. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Interglacial Leaf waxes Carbon stable isotopes C3 vs. C4 vegetation Climate change |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000382591600023 |
WOS关键词 | DIALKYL GLYCEROL TETRAETHERS ; WAX N-ALKANES ; DELTA-C-13 ANALYSES ; AQUATIC ORGANISMS ; RECENT SEDIMENTS ; LAKE-SEDIMENTS ; CARBON ; LIPIDS ; DISTRIBUTIONS ; PLANTS |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/195347 |
作者单位 | 1.Univ Pittsburgh, Dept Geol & Environm Sci, Pittsburgh, PA 15260 USA; 2.Univ Minnesota, Large Lakes Observ, Duluth, MN 55812 USA; 3.Univ Minnesota, Dept Geol Sci, Duluth, MN 55812 USA; 4.No Arizona Univ, Sch Earth Sci & Environm Sustainabil, Environm Programs, Flagstaff, AZ 86011 USA; 5.Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA |
推荐引用方式 GB/T 7714 | Contreras, Sergio,Werne, Josef P.,Brown, Erik T.,et al. A molecular isotope record of climate variability and vegetation response in southwestern North America during mid-Pleistocene glacial/interglacial cycles[J],2016,459:338-347. |
APA | Contreras, Sergio,Werne, Josef P.,Brown, Erik T.,Anderson, R. Scott,&Fawcett, Peter J..(2016).A molecular isotope record of climate variability and vegetation response in southwestern North America during mid-Pleistocene glacial/interglacial cycles.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,459,338-347. |
MLA | Contreras, Sergio,et al."A molecular isotope record of climate variability and vegetation response in southwestern North America during mid-Pleistocene glacial/interglacial cycles".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 459(2016):338-347. |
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