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

QUATERNARY SCIENCE REVIEWS

卷:170

Article

Koffman, Tobias N. B.¹  Schaefer, Joerg M.^1,2  Putnam, Aaron E.^1,3,4  Denton, George H.^1,3,4  Barrell, David J. A.⁵  Rowan, Ann V.⁶  Finkel, Robert C.⁷  Rood, Dylan H.^8,9  Schwartz, Roseanne¹  Plummer, Mitchell A.¹⁰  Brocklehurst, Simon H.¹¹ 

[1] Columbia Univ, Lamont Doherty Earth Observ, 61 Rt 9W, Palisades, NY 10964 USA

[2] Columbia Univ, Dept Earth & Environm Sci, New York, NY 10027 USA

[3] Univ Maine, Sch Earth & Climate Sci, Orono, ME 04469 USA

[4] Univ Maine, Climate Change Inst, Orono, ME 04469 USA

[5] GNS Sci, Private Bag 1930, Dunedin 9054, New Zealand

[6] Univ Sheffield, Dept Geog, Sheffield SI0 2TN, S Yorkshire, England

[7] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 95064 USA

[8] Imperial Coll London, Dept Earth Sci & Engn, South Kensington Campus, London SW7 2AZ, England

[9] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA

[10] Idaho Natl Lab, Idaho Falls, ID 83415 USA

[11] Univ Manchester, Sch Earth & Environm Sci, Manchester M139PL, Lancs, England

关键词: Pleistocene;    Holocene;    Paleoclimatology;    Glaciology;    Southern Pacific;    Cosmogenic isotopes;    Glacial geomorphology;    Glaciological modeling;   

DOI  :  10.1016/j.quascirev.2017.06.012

来源: Elsevier

【 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 (Be-10) 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 [1 sigma; +/- 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 degrees 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 similar to 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 degrees 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 degrees S north to at least 36 degrees S, and thus was a major feature of Southern Hemisphere paleoclimate during the last glacial termination. (C) 2017 Elsevier Ltd. All rights reserved.

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