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https://doi.org/10.5194/tc-2017-51
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/tc-2017-51
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
25 Apr 2017
Status: this preprint was under review for the journal TC but the revision was not accepted.
Brief communication: Changing mid-twentieth century Antarctic sea ice variability linked to tropical forcing
Abstract. Satellite observations demonstrate Antarctic sea ice extent increased between late-1978 and 2015, with significant spatial and seasonal variability. Late spring retreat off George V Land is a major component of the observed increase, but the paucity of proxy records makes interpretation of trends (and impacts) challenging. Here Earth-system modelling and reanalysis demonstrate tropical Pacific warming can trigger an atmospheric Rossby wave response during the austral spring, delaying sea-ice retreat off George V Land. Our results provide new insights into the spatial and temporal role low latitudes play in Antarctic sea-ice production, drift and ocean circulation on decadal to centennial timescales.
How to cite. Turney, C. S. ~M., Klekociuk, A., Fogwill, C. J., Zunz, V., Goosse, H., Parkinson, C. L., Compo, G., Lazzara, M., Keller, L., Allan, R., Palmer, J. G., Clark, G., and Marzinelli, E.: Brief communication: Changing mid-twentieth century Antarctic sea ice variability linked to tropical forcing, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2017-51, 2017.
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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SC1: 'Rossby waves and the PSA', Terence O'Kane, 10 May 2017
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AC1: 'Reply to review', Christian Turney, 19 Jul 2017
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AC1: 'Reply to review', Christian Turney, 19 Jul 2017
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RC1: 'Review of Turney et al. 2017', Anonymous Referee #1, 23 May 2017
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AC2: 'Reply to review', Christian Turney, 19 Jul 2017
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AC2: 'Reply to review', Christian Turney, 19 Jul 2017
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RC2: 'Referee comments to the paper: Brief communication: Changing mid-twentieth century Antarctic sea ice variability linked to tropical forcing', Anonymous Referee #2, 30 May 2017
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AC3: 'Reply to review', Christian Turney, 19 Jul 2017
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AC3: 'Reply to review', Christian Turney, 19 Jul 2017
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
- Printer-friendly version
- Supplement
-
SC1: 'Rossby waves and the PSA', Terence O'Kane, 10 May 2017
-
AC1: 'Reply to review', Christian Turney, 19 Jul 2017
-
AC1: 'Reply to review', Christian Turney, 19 Jul 2017
-
RC1: 'Review of Turney et al. 2017', Anonymous Referee #1, 23 May 2017
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AC2: 'Reply to review', Christian Turney, 19 Jul 2017
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AC2: 'Reply to review', Christian Turney, 19 Jul 2017
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RC2: 'Referee comments to the paper: Brief communication: Changing mid-twentieth century Antarctic sea ice variability linked to tropical forcing', Anonymous Referee #2, 30 May 2017
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AC3: 'Reply to review', Christian Turney, 19 Jul 2017
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AC3: 'Reply to review', Christian Turney, 19 Jul 2017
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Chris S.~M. Turney
Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Palaeontology, Geobiology and Earth Archives Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Andrew Klekociuk
Australian Antarctic Division, 203 Channel Highway, Kingston 7050, Tasmania, Australia
Antarctic Climate & Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001
Christopher J. Fogwill
Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Palaeontology, Geobiology and Earth Archives Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Violette Zunz
Earth System Science and Departement Geografie, Vrije Universiteit Brussels, Belgium
Hugues Goosse
Université catholique de Louvain, Earth and Life Institute, Georges Lemaître Centre for Earth and Climate Research, Place Pasteur, 3, 1348 Louvain-la-Neuve, Belgium
Claire L. Parkinson
Cryospheric Sciences Laboratory/Code 615, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Gilbert Compo
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA
Physical Sciences Division, Earth System Research Laboratory, NOAA, Boulder, CO 80305, USA
Matthew Lazzara
Meteorologist at the Antarctic Meteorological Research Center, Space Science and Engineering Center, University of Wisconsin–Madison, Madison, WI, USA
Department of Physical Sciences, School of Arts and Sciences, Madison Area Technical College, Madison, WI, USA
Linda Keller
Meteorologist at the Antarctic Meteorological Research Center, Space Science and Engineering Center, University of Wisconsin–Madison, Madison, WI, USA
Rob Allan
Met Office Hadley Centre, Exeter, UK
Jonathan G. Palmer
Climate Change Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Palaeontology, Geobiology and Earth Archives Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Graeme Clark
Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Ezequiel Marzinelli
Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Sydney Institute of Marine Science, Chowder Bay Road, Mosman NSW 2088, Australia
Centre for Bio-Innovation Science, School of Biological, Earth and Environmental Sciences, University of New South Wales, Australia
Short summary
We demonstrate that a mid-twentieth century decrease in geopotential height in the southwest Pacific marks a Rossby wave response to equatorial Pacific warming, leading to enhanced easterly airflow off George V Land. Our results suggest that in contrast to ozone hole-driven changes in the Amundsen Sea, the 1979–2015 increase in sea ice extent off George V Land may be in response to reduced northward Ekman drift and enhanced (near-coast) production as a consequence of low latitude forcing.
We demonstrate that a mid-twentieth century decrease in geopotential height in the southwest...