Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-95
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
01 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).
The Ross Sea Dipole – Temperature, Snow Accumulation and Sea Ice Variability in the Ross Sea Region, Antarctica, over the Past 2,700 Years
Nancy A. N. Bertler1,2, Howard Conway3, Dorthe Dahl-Jensen4, Daniel B. Emanuelsson1,2, Mai Winstrup4, Paul T. Vallelonga4, James E. Lee5, Ed J. Brook5, Jeffrey P. Severinghaus6, Taylor J. Fudge3, Elizabeth D. Keller2, W. Troy Baisden2, Richard C. A. Hindmarsh7, Peter D. Neff8,a, Thomas Blunier4, Ross Edwards9, Paul A. Mayewski10, Sepp Kipfstuhl11, Christo Buizert5, Silvia Canessa2, Ruzica Dadic1, Helle A. Kjær4, Andrei Kurbatov10, Dongqi Zhang12,13, Ed D. Waddington3, Giovanni Baccolo14, Thomas Beers10, Hannah J. Brightley1,2, Lionel Carter1, David Clemens-Sewall15, Viorela G. Ciobanu4, Barbara Delmonte14, Lukas Eling1,2, Aja A. Ellis16,b, Shruthi Ganesh17, Nicholas R. Golledge1,2, Skylar A. Haines10, Michael Handley10, Robert L. Hawley15, Chad M. Hogan18, Katelyn M. Johnson1,2, Elena Korotkikh10, Daniel P. Lowry1, Darcy Mandeno1, Robert M. McKay1, James A. Menking5, Timothy R. Naish1, Caroline Noerling11, Agathe Ollive19, Anaïs Orsi20, Bernadette C. Proemse18, Alexander R. Pyne1, Rebecca L. Pyne2, James Renwick1, Reed P. Scherer21, Stefanie Semper22, Marius Simonsen4, Sharon B. Sneed3, Eric J. Steig10, Andrea Tuohy23,c, Abhijith Ulayottil Venugopal1,2, Fernando Valero-Delgado11, Janani Venkatesh17, Feitang Wang24, Shimeng Wang13, Dominic A. Winski15, Victoria H. L. Winton25,d, Arran Whiteford26, Cunde Xiao27, Jiao Yang13, and Xin Zhang28 1Antarctic Research Centre, Victoria University of Wellington, Wellington, 6012, New Zealand
2GNS Science, Lower Hutt, 5010, New Zealand
3Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
4Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
5College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97330, USA
6Scripps Institution of Oceanography, UC San Diego, La Jolla CA 92093, USA
7B ritish Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom
8Antarctic Research Centre, Victoria University of Wellington, Wellington, 6012, New Zealand
9Physics and Astronomy, Curtin University, Perth, Western Australia, Australia
10Climate Change Institute, University of Maine, Orono, ME 04469-5790, USA
11Alfred Wegner Institute, Bremen, Germany
12Chinese Academy of Meteorological Sciences, Beijing, China
13State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu, China
14DISAT, Department of Earth and Environmental Sciences, University Milano-Bicocca, Piazza della Scienza 1, 20126 Milano, Italy
15Department of Earth Sciences, Dartmouth College, 6105 Fairchild Hall, Hanover, NH 03755, USA
16Physics and Astronomy, Curtin University, Perth, Western Australia, Australia
17Department of Chemical Engineering, SRM University, Kattankulathur – 603203, Kancheepuram Dt., Tamil Nadu, India
18University of Tasmania, School of Biological Sciences, Hobart, TAS, 7001 Australia
19Specialty of Earth Sciences and Environment, UniLasalle, 19 rue Pierre Waguet, 60000 Beauvais, France
20Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, F-91198 Gif-sur-Yvette, France
21Northern Illinois University, USA
22Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, 5020 Bergen, Norway
23Antarctic Research Centre, Victoria University of Wellington and GNS Science, Wellington, New Zealand
24State Key Laboratory of Cryospheric Science/Tianshan Glaciology Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu, China
25Physics and Astronomy, Curtin University, Perth, Western Australia, Australia
26Department of Earth and Ocean Sciences, University of British Columbia, Canada
27State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing, China
28Northwest Normal University, Lanzhou, Gansu, China
aUniversity of Rochester, Department of Earth & Environmental Sciences, Rochester, NY, USA 14627
bCenter for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA 15213 USA
cTonkin and Taylor, ABS Tower, 2 Hunter St., Wellington, 6011, New Zealand
dBritish Antarctic Survey, Cambridge CB3 0ET, United Kingdom
Abstract. High-resolution, well-dated climate archives provide an opportunity to investigate the dynamic interactions of climate patterns relevant for future projections. Here, we present data from a new, annually-dated ice core record from the eastern Ross Sea. Comparison of the Roosevelt Island Climate Evolution (RICE) ice core records with climate reanalysis data for the 1979–2012 calibration period shows that RICE records reliably capture temperature and snow precipitation variability of the region. RICE is compared with data from West Antarctica (West Antarctic Ice Sheet Divide Ice Core) and the western (Talos Dome) and eastern (Siple Dome) Ross Sea. For most of the past 2,700 years, the eastern Ross Sea was warming with perhaps increased snow accumulation and decreased sea ice extent. However, West Antarctica cooled whereas the western Ross Sea showed no significant temperature trend. From the 17th Century onwards, this relationship changes. All three regions now show signs of warming, with snow accumulation declining in West Antarctica and the eastern Ross Sea, but increasing in the western Ross Sea. Analysis of decadal to centennial-scale climate variability superimposed on the longer term trend reveal that periods characterised by opposing temperature trends between the Eastern and Western Ross Sea have occurred since the 3rd Century but are masked by longer-term trends. This pattern here is referred to as the Ross Sea Dipole, caused by a sensitive response of the region to dynamic interactions of the Southern Annual Mode and tropical forcings.

Citation: Bertler, N. A. N., Conway, H., Dahl-Jensen, D., Emanuelsson, D. B., Winstrup, M., Vallelonga, P. T., Lee, J. E., Brook, E. J., Severinghaus, J. P., Fudge, T. J., Keller, E. D., Baisden, W. T., Hindmarsh, R. C. A., Neff, P. D., Blunier, T., Edwards, R., Mayewski, P. A., Kipfstuhl, S., Buizert, C., Canessa, S., Dadic, R., Kjær, H. A., Kurbatov, A., Zhang, D., Waddington, E. D., Baccolo, G., Beers, T., Brightley, H. J., Carter, L., Clemens-Sewall, D., Ciobanu, V. G., Delmonte, B., Eling, L., Ellis, A. A., Ganesh, S., Golledge, N. R., Haines, S. A., Handley, M., Hawley, R. L., Hogan, C. M., Johnson, K. M., Korotkikh, E., Lowry, D. P., Mandeno, D., McKay, R. M., Menking, J. A., Naish, T. R., Noerling, C., Ollive, A., Orsi, A., Proemse, B. C., Pyne, A. R., Pyne, R. L., Renwick, J., Scherer, R. P., Semper, S., Simonsen, M., Sneed, S. B., Steig, E. J., Tuohy, A., Ulayottil Venugopal, A., Valero-Delgado, F., Venkatesh, J., Wang, F., Wang, S., Winski, D. A., Winton, V. H. L., Whiteford, A., Xiao, C., Yang, J., and Zhang, X.: The Ross Sea Dipole – Temperature, Snow Accumulation and Sea Ice Variability in the Ross Sea Region, Antarctica, over the Past 2,700 Years, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-95, in review, 2017.
Nancy A. N. Bertler et al.
Nancy A. N. Bertler et al.
Nancy A. N. Bertler et al.

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Short summary
Temperature and snow accumulation records from the annually-dated Roosevelt Island Climate Evolution (RICE) ice core show that for the past 2,700 years, the eastern Ross Sea warmed while the western Ross Sea showed no trend and West Antarctica cooled. From the 17th Century, all three regions warm, with dynamic changes in snow accumulation trends. A Ross Sea Dipole – opposing trends in the eastern and western Ross – Sea, is observed since the 3rd Century but is masked by longer-term trends.
Temperature and snow accumulation records from the annually-dated Roosevelt Island Climate...
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