DOI: 10.1016/j.quascirev.2015.04.011
Scopus记录号: 2-s2.0-84945437790
论文题名: Mid-Holocene drying of the U.S. Great Basin recorded in Nevada speleothems
作者: Steponaitis E. ; Andrews A. ; McGee D. ; Quade J. ; Hsieh Y.-T. ; Broecker W.S. ; Shuman B.N. ; Burns S.J. ; Cheng H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 127 起始页码: 174
结束页码: 185
语种: 英语
英文关键词: Great Basin
; Holocene
; Paleoclimate
; Speleothems
; U-Th dating
Scopus关键词: Atmospheric temperature
; Glaciers
; Infiltration
; Isotopes
; Lakes
; Magnesium
; Oceanography
; Soil moisture
; Storms
; Surface waters
; Trace elements
; Alternative hypothesis
; Great Basin
; Holocenes
; Paleoclimates
; Prior calcite precipitations
; Sea surface temperature (SST)
; Speleothems
; Trace element composition
; Drying
; arid region
; hiatus
; Holocene
; lake level
; Laurentide Ice Sheet
; paleoclimate
; precipitation (chemistry)
; sea surface temperature
; speleothem
; temporal record
; trace element
; uranium series dating
; water budget
; Canada
; Great Basin
; Hudson Bay
; Nevada
; Pacific Ocean
; Pacific Ocean (Equatorial)
; United States
英文摘要: Lake level records point to dramatic changes in Great Basin water balance over the last 25 ka, but the timing and pace of Holocene drying in the region remains poorly documented. Here we present stable isotope and trace metal data from two Lehman Caves, NV speleothems that provide a well-dated record of latest Pleistocene to mid-Holocene hydroclimate in the U.S. Great Basin. Together the stalagmites span the interval between 16.4 ka and 3.8 ka, with a hiatus from 15.0 ka to 12.7 ka. Mg/Ca and δ13C covary throughout the records, consistent with control by the extent of degassing and prior calcite precipitation (PCP); measurements of modern cave and soil waters support PCP as the primary control on drip-water trace-element composition. We therefore interpret Mg/Ca and δ13C as reflecting infiltration rates, with higher values corresponding to drier periods. Both Mg/Ca and δ13C indicate a wet period at the beginning of the record (12.7-8.2 ka) followed by pronounced drying after 8.2 ka. This mid-Holocene drying is consistent with records from around the western United States, including a new compilation of Great Basin lake-level records. The strong temporal correspondence with the collapse of the Laurentide ice sheet over Hudson Bay suggests that this drying may have been triggered by northward movement of the winter storm track as a result of ice sheet retreat. However, we cannot rule out an alternative hypothesis that wet early Holocene conditions are related to equatorial Pacific sea-surface temperature. Regardless, our results suggest that Great Basin water balance in the early Holocene was driven by factors other than orbital changes. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59804
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Geosciences, University of Arizona, Tucson, AZ, United States; Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Department of Geology and Geophysics, University of Wyoming, Laramie, WY, United States; Department of Geosciences, University of Massachusetts Amherst, Amherst, MA, United States; Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, China
Recommended Citation:
Steponaitis E.,Andrews A.,McGee D.,et al. Mid-Holocene drying of the U.S. Great Basin recorded in Nevada speleothems[J]. Quaternary Science Reviews,2015-01-01,127