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The Ross Sea Dipole - temperature, snow accumulation and sea ice variability in the Ross Sea region, Antarctica, over the past 2700 years

TitleThe Ross Sea Dipole - temperature, snow accumulation and sea ice variability in the Ross Sea region, Antarctica, over the past 2700 years
Publication TypeJournal Article
Year of Publication2018
AuthorsBertler N.AN, Conway H., Dahl-Jensen D., Emanuelsson D.B, Winstrup M., Vallelonga P.T, Lee J.E, Brook E.J, Severinghaus JP, Fudge T.J, Keller E.D, Baisden W.T, Hindmarsh R.CA, Neff P.D, Blunier T., Edwards R., Mayewski P.A, Kipfstuhl S., Buizert C, Canessa S., Dadic R., Kjaer H.A, Kurbatov A., Zhang D.Q, Waddington E.D, Baccolo G., Beers T., Brightley H.J, Carter L., Clemens-Sewall D., Ciobanu V.G, Delmonte B., Eling L., Ellis A., Ganesh S., Golledge N.R, Haines S., 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., Venugopal A.U, Valero-Delgado F., Venkatesh J., Wang F.T, Wang S.M, Winski D.A, Winton V.HL, Whiteford A., Xiao C.D, Yang J., Zhang X.
JournalClimate of the Past
Date Published2018/02
Type of ArticleArticle
ISBN Number1814-9324
Accession NumberWOS:000425657600001
Keywordsamundsen sea; climate; east antarctica; Geology; grounding-line retreat; hemisphere surface; high-resolution; Meteorology & Atmospheric Sciences; Ocean circulation; Pacific decadal oscillation; Southern Annular mode; warming hiatus; west antarctica

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, named the Roosevelt Island Climate Evolution (RICE) ice core. Comparison of this record with climate reanalysis data for the 1979-2012 interval shows that RICE reliably captures temperature and snow precipitation variability in the region. Trends over the past 2700 years in RICE are shown to be distinct from those in West Antarctica and the western Ross Sea captured by other ice cores. For most of this interval, the eastern Ross Sea was warming (or showing isotopic enrichment for other reasons), with increased snow accumulation and perhaps decreased sea ice concentration. However, West Antarctica cooled and the western Ross Sea showed no significant isotope temperature trend. This pattern here is referred to as the Ross Sea Dipole. Notably, during the Little Ice Age, West Antarctica and the western Ross Sea experienced colder than average temperatures, while the eastern Ross Sea underwent a period of warming or increased isotopic enrichment. From the 17th century onwards, this dipole relationship changed. All three regions show current warming, with snow accumulation declining in West Antarctica and the eastern Ross Sea but increasing in the western Ross Sea. We interpret this pattern as reflecting an increase in sea ice in the eastern Ross Sea with perhaps the establishment of a modern Roosevelt Island polynya as a local moisture source for RICE.

Short TitleClim. Past.
Student Publication: