globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.08.010
论文题名:
A record of wet glacial stages and dry interglacial stages over the last 560kyr from a standing massive stalagmite in Carlsbad Cavern, New Mexico, USA
作者: Railsback L.B.; Brook G.A.; Ellwood B.B.; Liang F.; Cheng H.; Edwards R.L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 438
起始页码: 256
结束页码: 266
语种: 英语
英文关键词: Carlsbad ; Glacials ; Palaeoclimate ; Pleistocene ; Quaternary ; Stalagmite
英文摘要: A horizontal core through a large, standing, stalagmite in Carlsbad Caverns National Park, New Mexico, USA, provides a radiometrically dated record of wetter glacial stages and drier interglacial stages over the last 560. kyr. The stalagmite, the Texas Toothpick, is about 7. m tall and about 3. m wide at its base. Two cores through the stalagmite reveal five distinct matching layers, and the best estimates from twenty U-Th ages indicate that those layers were deposited during MIS 6, 8, 10, 12, and 14, the five glacial periods ending with the Penultimate Glacial Maximum (PGM). Stable isotope data, measurements of remanent magnetism, and petrographic observations combine to suggest that conditions during glacials, the periods in which deposition took place, were significantly wetter than today. On the other hand, the stalagmite's hiatuses seemingly represent conditions during interglacials similar to or drier than today. These results combine with modern climatological observations to suggest 100-kyr-scale alternation between wetter conditions with an increased proportion of winter rainfall from a Pacific source during glacials to drier conditions with largely summer rainfall derived from the Gulf of Mexico during interglacials. The length and continuity of the results confirm that the pattern of wetter glacials and drier interglacials, known previously from studies isolated in time, existed across all of at least the last six glacial cycles. Simple monotonic extrapolation of these findings from cooler wetter glacials of the past and warmer drier interglacials like the present to a warmer climate expected in the coming century suggests that groundwater in the already © 2015 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/68802
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geology, University of Georgia, Athens, GA, United States; Department of Geography, University of Georgia, Athens, GA, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, United States; Department of Geography, Western Illinois University, 1 University Circle, Macomb, IL, United States; College of Global Environmental Change, Xi'an Jiaotong University, Xi'an, Shaanxi, China; Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN, United States

Recommended Citation:
Railsback L.B.,Brook G.A.,Ellwood B.B.,et al. A record of wet glacial stages and dry interglacial stages over the last 560kyr from a standing massive stalagmite in Carlsbad Cavern, New Mexico, USA[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,438
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