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Southern Ocean deep convection as a driver of Antarctic warming events

Pedro, J. B., Martin, T., Steig, E. J., Jochum, M., Park, W., Rasmussen, S. O.·2016·Geophysical Research Letters
DOI 10.1002/2016gl067861
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Abstract

Simulations with a free‐running coupled climate model show that heat release associated with Southern Ocean deep convection variability can drive centennial‐scale Antarctic temperature variations of up to 2.0°C. The mechanism involves three steps: Preconditioning: heat accumulates at depth in the Southern Ocean; Convection onset: wind and/or sea ice changes tip the buoyantly unstable system into the convective state; and Antarctic warming: fast sea ice‐albedo feedbacks (on annual‐decadal time scales) and slow Southern Ocean frontal and sea surface temperature adjustments to convective heat release (on multidecadal‐century time scales) drive an increase in atmospheric heat and moisture transport toward Antarctica. We discuss the potential of this mechanism to help drive and amplify climate variability as observed in Antarctic ice core records.

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  • Small fluctuations in temperature and precipitation have been recorded during the middle and late Holocene in various areas, but they require validation at local level from systematic paleoclimatic data not yet available for the study area.

    “Si bien se han registrado pequeñas fluctuaciones en temperatura y precipitación durante el Holoceno medio y tardío en diversas áreas (Marcott et al., 2013;de Pedro et al., 2016;D'Abramo et al., 2021), las mismas requieren ser validadas a nivel local a partir de datos paleoclimáticos sistemáticos que aún no se encuentran disponibles para el área de estudio.”

    From Conectividad estacional del paisaje y el registro arqueológico del norte de neuquén (noroeste de patagonia) (2023) · cites this paper as de Pedro et al., 2016

  • From 5000 BP, modern climatic conditions consolidated, characterized by marked stability.

    “A partir del 5.000 AP se consolidaron las condiciones climáticas modernas caracterizadas por una marcada estabilidad (Marcott et al., 2013;Pedro et al., 2016;D'Abramo et al., 2021).”

    From Conectividad estacional del paisaje y el registro arqueológico del norte de neuquén (noroeste de patagonia) (2023) · cites this paper as Pedro et al., 2016

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Metadata

Authors
Pedro, J. B., Martin, T., Steig, E. J., Jochum, M., Park, W., & Rasmussen, S. O.
Affiliations
  • Center for Ice and Climate, Niels Bohr Institute University of Copenhagen Copenhagen Denmark
  • GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany
  • Quaternary Research Center and Department of Earth and Space Sciences University of Washington Seattle Washington USA
Venue
Geophysical Research Letters
Publisher
American Geophysical Union (AGU)
Published
2016-03-12
Volume
43
Issue
5
Pages
2192-2199
ISSN
  • 0094-8276
  • 1944-8007
DOI
10.1002/2016gl067861
Cited by
51
References
1
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Funders
  • European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013)
  • ERC (610055)
  • Joint Institute for the Study of the Atmosphere and Ocean (JISAO contribution 2461)
  • Marie Curie International Incoming Fellowship

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