globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.012
论文题名:
A beryllium-10 chronology of late-glacial moraines in the upper Rakaia valley, Southern Alps, New Zealand supports Southern-Hemisphere warming during the Younger Dryas
作者: Koffman T.N.B.; Schaefer J.M.; Putnam A.E.; Denton G.H.; Barrell D.J.A.; Rowan A.V.; Finkel R.C.; Rood D.H.; Schwartz R.; Plummer M.A.; Brocklehurst S.H.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 170
起始页码: 14
结束页码: 25
语种: 英语
英文关键词: Cosmogenic isotopes ; Glacial geomorphology ; Glaciological modeling ; Glaciology ; Holocene ; Paleoclimatology ; Pleistocene ; Southern Pacific
Scopus关键词: Atmospheric temperature ; Beryllium ; Geomorphology ; Knobs ; Landforms ; Upper atmosphere ; Cosmogenic isotopes ; Glacial geomorphology ; Glaciology ; Holocenes ; Paleoclimatology ; Pleistocene ; Southern Pacific ; Glacial geology
英文摘要: Interhemispheric differences in the timing of pauses or reversals in the temperature rise at the end of the last ice age can help to clarify the mechanisms that influence glacial terminations. Our beryllium-10 (10Be) surface-exposure chronology for the moraines of the upper Rakaia valley of New Zealand's Southern Alps, combined with glaciological modeling, show that late-glacial temperature change in the atmosphere over the Southern Alps exhibited an Antarctic-like pattern. During the Antarctic Cold Reversal, the upper Rakaia glacier built two well-defined, closely-spaced moraines on Reischek knob at 13,900 ± 120 [1σ; ± 310 yrs when including a 2.1% production-rate (PR) uncertainty] and 13,140 ± 250 (±370) yrs ago, in positions consistent with mean annual temperature approximately 2 °C cooler than modern values. The formation of distinct, widely-spaced moraines at 12,140 ± 200 (±320) and 11,620 ± 160 (±290) yrs ago on Meins Knob, 2 km up-valley from the Reischek knob moraines, indicates that the glacier thinned by ∼250 m during Heinrich Stadial 0 (HS 0, coeval with the Younger Dryas 12,900 to 11,600 yrs ago). The glacier-inferred temperature rise in the upper Rakaia valley during HS 0 was about 1 °C. Because a similar pattern is documented by well-dated glacial geomorphologic records from the Andes of South America, the implication is that this late-glacial atmospheric climate signal extended from 79°S north to at least 36°S, and thus was a major feature of Southern Hemisphere paleoclimate during the last glacial termination. © 2017 Elsevier Ltd
资助项目: Putnam, A.E. ; Lamont–Doherty Earth Observatory of Columbia University, 61 Rt. 9W, United States ; 电子邮件: aaron.putnam@maine.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59147
Appears in Collections:过去全球变化的重建

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作者单位: Lamont–Doherty Earth Observatory of Columbia University, 61 Rt. 9W, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; School of Earth and Climate Sciences and Climate Change Institute, University of Maine, Orono, ME, United States; GNS Science, Private Bag 1930, Dunedin, New Zealand; Department of Geography, University of Sheffield, Sheffield, United Kingdom; Department of Earth and Planetary Sciences, University of California, Berkeley, CA, United States; Department of Earth Science & Engineering, Imperial College London, South Kensington Campus, London, United Kingdom; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, United States; Idaho National Laboratory, Idaho Falls, ID, United States; School of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom

Recommended Citation:
Koffman T.N.B.,Schaefer J.M.,Putnam A.E.,et al. A beryllium-10 chronology of late-glacial moraines in the upper Rakaia valley, Southern Alps, New Zealand supports Southern-Hemisphere warming during the Younger Dryas[J]. Quaternary Science Reviews,2017-01-01,170
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