Changes in El Nino - Southern Oscillation (ENSO) conditions during the Greenland Stadial 1 (GS-1) chronozone revealed by NeW Zealand tree-rings

QUATERNARY SCIENCE REVIEWS

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Article

Palmer, Jonathan G.¹  Turney, Chris S. M.¹  Cook, Edward R.²  Fenwick, Pavla³  Thomas, Zoe¹  Helle, Gerhard⁴  Jones, Richard⁵  Clement, Amy⁶  Hogg, Alan⁷  Southon, John⁸  Ramsey, Christopher Bronk⁹  Staff, Richard⁹  Muscheler, Raimund¹⁰  Correge, Thierry¹¹  Hua, Quan¹² 

[1] Univ New South Wales, Sch Biol Earth & Environm Sci, Climate Change Res Ctr, Sydney, NSW, Australia

[2] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[3] Gondwana Tree Ring Lab, POB 14, Canterbury 7546, New Zealand

[4] GFZ German Research Ctr GeoSci, Sect 5-2, D-14473 Potsdam, Germany

[5] Univ Exeter, Dept Geog, Exeter EX4 4RJ, Devon, England

[6] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker, Miami, FL 33149 USA

[7] Univ Waikato, Waikato Radiocarbon Lab, Private Bag 3105, Hamilton, New Zealand

[8] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA

[9] Univ Oxford, Res Lab Archaeol & Hist Art, Dyson Perrins Bldg,South Parks Rd, Oxford OX1 3QY, England

[10] Lund Univ, Dept Geol Quaternary Sci, S-22362 Lund, Sweden

[11] Univ Bordeaux, EPOC OASU, UMR CNRS 5805, F-33615 Pessac, France

[12] Australian Nucl Sci & Technol Org, Locked Bag 2001, Kirrawee Dc, NSW 2232, Australia

关键词: Dendrochronology;    Kauri (Agathis australis);    Abrupt climate change;    Bipolar seesaw;    Younger Dryas (YD);    Antarctic Cold Reversal (ACR);    Last Termination;   

DOI  :  10.1016/j.quascirev.2016.10.003

来源: Elsevier

【 摘 要 】

The warming trend at the end of the last glacial was disrupted by rapid cooling clearly identified in Greenland (Greenland Stadial 1 or GS-1) and Europe (Younger Dryas Stadial or YD). This reversal to glacial-like conditions is one of the best known examples of abrupt change but the exact timing and global spatial extent remain uncertain. Whilst the wider Atlantic region has a network of high-resolution proxy records spanning GS-1, the Pacific Ocean suffers from a scarcity of sub-decadally resolved sequences. Here we report the results from an investigation into a tree-ring chronology from northern New Zealand aimed at addressing the paucity of data. The conifer tree species kauri (Agathis australis) is known from contemporary studies to be sensitive to regional climate changes. An analysis of a 'historic' 452-year kauri chronology confirms a tropical-Pacific teleconnection via the El Nino Southern Oscillation (ENSO). We then focus our study on a 1010-year sub-fossil kauri chronology that has been precisely dated by comprehensive radiocarbon dating and contains a striking ring-width downturn between 12,500 and 12,380 cal BP within GS-1. Wavelet analysis shows a marked increase in ENSO-like periodicities occurring after the downturn event. Comparison to low-and mid-latitude Pacific records suggests a coherency with ENSO and Southern Hemisphere atmospheric circulation change during this period. The driver(s) for this climate event remain unclear but may be related to solar changes that subsequently led to establishment and/or increased expression of ENSO across the mid-latitudes of the Pacific, seemingly independent of the Atlantic and polar regions. (C) 2016 Elsevier Ltd. All rights reserved.

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