DOI: 10.1016/j.quascirev.2015.06.016
Scopus记录号: 2-s2.0-84945495301
论文题名: Great Basin hydrology, paleoclimate, and connections with the North Atlantic: A speleothem stable isotope and trace element record from Lehman Caves, NV
作者: Cross M. ; McGee D. ; Broecker W.S. ; Quade J. ; Shakun J.D. ; Cheng H. ; Lu Y. ; Edwards R.L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 127 起始页码: 186
结束页码: 198
语种: 英语
英文关键词: Carbon isotopes
; Effective precipitation
; Great Basin
; Heinrich Stadial
; Oxygen isotopes
; Speleothem
; Termination II
; Trace elements
Scopus关键词: Atmospheric thermodynamics
; Carbon
; Caves
; Climate change
; Glacial geology
; Incident solar radiation
; Isotopes
; Magnesium
; Moisture
; Solar radiation
; Thorium
; Trace elements
; Uranium
; Carbon isotopes
; Great Basin
; Heinrich Stadial
; Oxygen isotopes
; Speleothem
; Termination II
; Strontium
; atmospheric gas
; Boreal
; carbon dioxide
; carbon isotope
; ice sheet
; marine isotope stage
; oxygen isotope
; paleoclimate
; precipitation (chemistry)
; speleothem
; stable isotope
; stalagmite
; temperature effect
; trace element
; Alaska
; Aleutian Islands
; Atlantic Ocean
; Atlantic Ocean (North)
; China
; Far East
; Great Basin
; Nevada
; United States
英文摘要: We present a record of speleothem stable isotope (δ18O, δ13C) and trace element (Mg/Ca, Sr/Ca) variations from Lehman Caves, Nevada for an interval of time (139-128 ka) that encompasses the penultimate glacial termination, Termination II (T-II). Additional growth phases provide data from about 123 ka, a time that correlates with Marine Isotope Stage (MIS) 5e, and about 84 ka and between 82 and 81 ka (MIS 5a). Chronologies from two new stalagmites are anchored by thirty-six uranium-thorium dates. We also present new trace element data from stalagmite LC-2, which has a previously published uranium-thorium chronology and stable isotope record of T-II (Shakun et al., 2011). Our T-II δ18O record broadly replicates that of the Shakun et al. (2011) and Lachniet et al. (2014) records of this time, recording low values from 139 to 135 ka followed by an approximately 3.5‰ increase over an extended interval between 134 and 129 ka. This rise in δ18O values occurs during Heinrich Stadial 11 and the associated Weak Monsoon Interval observed in Chinese caves; our record broadly follows the marine termination, rising boreal summer insolation, and the rise in atmospheric CO2. We infer that this shift results from temperature increase due to increasing atmospheric CO2 and potentially a change in moisture source or precipitation seasonality from greater influence of the North American Monsoon accompanying summer insolation increase. It is also plausible that the melting of the ice sheet itself may have contributed to both temperature and precipitation seasonality changes. Trace element ratios and δ13C values are largely decoupled from δ18O values, showing minimal variation between 139 and 130 ka, for the duration of the Chinese Weak Monsoon Interval. However, these values increase sharply between 130 and 128 ka, which we interpret as increased prior calcite precipitation driven by a transition from wet to dry conditions. This abrupt drying event coincides within dating uncertainties with the abrupt strengthening of the East Asian summer monsoon, which marks the end of both the Weak Monsoon Interval and Heinrich Stadial 11. Our records demonstrate a link between North Atlantic climate and Great Basin moisture during this time that is consistent with the interpretation of data from the last glacial period and may result from abrupt shifts in Atlantic Meridional Overturning Circulation affecting the strength of the Aleutian Low. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59806
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, MN, United States; Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, United States; Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, NY, United States; Department of Geosciences, University of Arizona, 1040 E. 4th St., Tucson, AZ, United States; Department of Earth and Environmental Sciences, Boston College, 140 Commonwealth Ave., Chestnut Hill, MA, United States
Recommended Citation:
Cross M.,McGee D.,Broecker W.S.,et al. Great Basin hydrology, paleoclimate, and connections with the North Atlantic: A speleothem stable isotope and trace element record from Lehman Caves, NV[J]. Quaternary Science Reviews,2015-01-01,127