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Title

Evolution of the Southern Annular Mode during the past millennium

Publication Year

2014

Author(s)
  • Abram, Nerilie J.
  • Mulvaney, Robert
  • Vimeux, Francoise
  • Phipps, Steven J.
  • Turner, John
  • England, Matthew H.
Source
NATURE CLIMATE CHANGE Volume: 4 Issue: 7 Pages: 564-569 Published: 2014
ISSN
1758-678X eISSN: 1758-6798
Abstract

The Southern Annular Mode (SAM) is the primary pattern of climate variability in the Southern Hemisphere(1,2), influencing latitudinal rainfall distribution and temperatures from the subtropics to Antarctica. The positive summer trend in the SAM over recent decades is widely attributed to stratospheric ozone depletion(2); however, the brevity of observational records from Antarctica(1)-one of the core zones that defines SAM variability-limits our understanding of long-term SAM behaviour. Here we reconstruct annual mean changes in the SAM since AD 1000 using, for the first time, proxy records that encompass the full mid-latitude to polar domain across the Drake Passage sector. We find that the SAM has undergone a progressive shift towards its positive phase since the fifteenth century, causing cooling of the main Antarctic continent at the same time that the Antarctic Peninsula has warmed. The positive trend in the SAM since similar to AD 1940 is reproduced by multimodel climate simulations forced with rising greenhouse gas levels and later ozone depletion, and the long-term average SAM index is now at its highest level for at least the past 1,000 years. Reconstructed SAM trends before the twentieth century are more prominent than those in radiative-forcing climate experiments and may be associated with a teleconnected response to tropical Pacific climate. Our findings imply that predictions of further greenhouse-driven increases in the SAM over the coming century(3) also need to account for the possibility of opposing effects from tropical Pacific climate changes.

Author Keyword(s)
    KeyWord(s) Plus
    • CLIMATE FORCING RECONSTRUCTIONS
    • LAST MILLENNIUM
    • PMIP SIMULATIONS
    • TEMPERATURE
    • 20TH-CENTURY
    • VARIABILITY
    • TRENDS
    • ICE
    • IMPACT
    • CMIP5
    ESI Discipline(s)
    • Environment/Ecology
    • Geosciences
    • Social Sciences
    Web of Science Category(ies)
    • Environmental Sciences
    • Environmental Studies
    • Meteorology & Atmospheric Sciences
    Adress(es)

    [Abram, Nerilie J.; Mulvaney, Robert; Turner, John] British Antarctic Survey, NERC, Cambridge CB3 0ET, England; [Abram, Nerilie J.] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia; [Vimeux, Francoise] Inst Rech Dev, Lab HydroSci Montpellier, F-91191 Gif Sur Yvette, France; [Vimeux, Francoise] Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France; [Phipps, Steven J.; England, Matthew H.] Univ New S Wales, Climate Change Res Ctr, Sydney, NSW 2052, Australia; [Phipps, Steven J.; England, Matthew H.] Univ New S Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW 2052, Australia

    Reprint Adress

    Abram, NJ (reprint author), British Antarctic Survey, NERC, Cambridge CB3 0ET, England.

    Country(ies)
    • Australia
    • France
    • United Kingdom
    CNRS - Adress(es)
    • HydroSciences Montpellier (HSM), UMR5569
    • Laboratoire des sciences du climat et de l'environnement (LSCE), UMR8212
    Accession Number
    WOS:000338837400020
    uid:/CS7K1F49
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