Variability of Sea-Ice Extent in Baffin Bay over the Last Millennium |
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Authors: | Nancy S. Grumet Cameron P. Wake Paul A. Mayewski Gregory A. Zielinski Sallie I. Whitlow Roy M. Koerner David A. Fisher James M. Woollett |
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Affiliation: | (1) Climate Change Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, 03824, U.S.A;(2) Geological Survey of Canada, Ottawa, Ontario, K1A 0E8, Canada;(3) Peary MacMillian Arctic Museum, Bowdoin College, Brunswick, ME, 04011, U.S.A |
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Abstract: | Comparison of an ice core glaciochemical time-series developed from thePenny Ice Cap (PIC), Baffin Island and monthly sea-ice extent reveals astatisticallysignificant inverse relationship between changes in Baffin Bay spring sea-iceextent andPenny Ice Cap sea-salt concentrations for the period 1901–1990 AD.Empiricalorthogonal function analysis demonstrates the joint behavior between changesin PICsea-salt concentrations, sea-ice extent, and changes in North Atlanticatmosphericcirculation. Our results suggest that sea-salt concentrations in snowpreserved on thePIC reflect local to regional springtime sea-ice coverage. The PIC sea-saltrecord/sea-ice relationship is further supported by decadal and century scalecomparisonwith other paleoclimate records of eastern Arctic climate change over the last700 years. Our sea-salt record suggests that, while the turn of the century wascharacterized bygenerally milder sea-ice conditions in Baffin Bay, the last few decades ofsea-ice extentlie within Little Ice Age variability and correspond to instrumental recordsof lowertemperatures in the Eastern Canadian Arctic over the past three decades. |
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