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The Ross Sea Dipole - temperature, snow accumulation and sea ice variability in the Ross Sea Region, Antarctica, over the past 2,700 years


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Bertler, NAN, Conway, H, Dahl-Jensen, D, Emanuelsson, DB, Winstrup, M, Vallelonga, PT, Lee, JE, Brook, EJ, Severinghaus, JP, Fudge, TJ, Keller, ED, Baisden, WT, Hindmarsh, RCA, Neff, PD, Blunier, T, Edwards, R, Mayewski, PA, Kipfstuhl, S, Buizert, C, Canessa, S, Dadic, R, Kjaer, HA, Kurbatov, A, Zhang, D, Waddington, ED, Baccolo, G, Beers, T, Brightley, HJ, Carter, L, Clemens-Sewall, D, Ciobanu, VG, Delmonte, B, Eling, L, Ellis, AA, Ganesh, S, Golledge, NR, Haines, S, Handley, M, Hawley, RL, Hogan, CM ORCID: 0000-0002-3894-8409, Johnson, KM, Korotkikh, E, Lowry, DP, Mandeno, D, McKay, RM, Menking, JA, Naish, TR, Noerling, C, Ollive, A, Orsi, A, Proemse, BC ORCID: 0000-0002-6630-6892, Pyne, AR, Pyne, RL, Renwick, J, Scherer, RP, Semper, S, Simonsen, M, Sneed, SB, Steig, EJ, Tuoy, A, Venugopal, AU, Valero-Delgado, F, Venkatesh, J, Wang, Feitang, Wang, S, Winski, DA, Winton, VHL, Whiteford, A, Xiao, C, Yang, J and Zhang, X 2017 , 'The Ross Sea Dipole - temperature, snow accumulation and sea ice variability in the Ross Sea Region, Antarctica, over the past 2,700 years' , Climate of the Past Discussions, vol. 14 , pp. 193-214 , doi: 10.5194/cp-2017-95.

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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.

Item Type: Article
Authors/Creators:Bertler, NAN and Conway, H and Dahl-Jensen, D and Emanuelsson, DB and Winstrup, M and Vallelonga, PT and Lee, JE and Brook, EJ and Severinghaus, JP and Fudge, TJ and Keller, ED and Baisden, WT and Hindmarsh, RCA and Neff, PD and Blunier, T and Edwards, R and Mayewski, PA and Kipfstuhl, S and Buizert, C and Canessa, S and Dadic, R and Kjaer, HA and Kurbatov, A and Zhang, D and Waddington, ED and Baccolo, G and Beers, T and Brightley, HJ and Carter, L and Clemens-Sewall, D and Ciobanu, VG and Delmonte, B and Eling, L and Ellis, AA and Ganesh, S and Golledge, NR and Haines, S and Handley, M and Hawley, RL and Hogan, CM and Johnson, KM and Korotkikh, E and Lowry, DP and Mandeno, D and McKay, RM and Menking, JA and Naish, TR and Noerling, C and Ollive, A and Orsi, A and Proemse, BC and Pyne, AR and Pyne, RL and Renwick, J and Scherer, RP and Semper, S and Simonsen, M and Sneed, SB and Steig, EJ and Tuoy, A and Venugopal, AU and Valero-Delgado, F and Venkatesh, J and Wang, Feitang and Wang, S and Winski, DA and Winton, VHL and Whiteford, A and Xiao, C and Yang, J and Zhang, X
Keywords: Ross Sea, Antarctica, sea ice
Journal or Publication Title: Climate of the Past Discussions
Publisher: Copernicus GmbH
ISSN: 1814-9340
DOI / ID Number: 10.5194/cp-2017-95
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© 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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