NORTH-ATLANTIC
; NORDIC SEAS
; OCEAN CIRCULATION
; RAPID CHANGES
; ASH ZONES
; MARINE
; GREENLAND
; OSCILLATIONS
; BIOMARKER
; RECORDS
WOS学科分类:
Multidisciplinary Sciences
WOS研究方向:
Science & Technology - Other Topics
英文摘要:
The last glacial period was marked by pronounced millennial-scale variability in ocean circulation and global climate. Shifts in sea ice cover within the Nordic Seas are believed to have amplified the glacial climate variability in northern high latitudes and contributed to abrupt, high-amplitude temperature changes over Greenland. We present unprecedented empirical evidence that resolves the nature, timing, and role of sea ice fluctuations for abrupt ocean and climate change 32 to 40 thousand years ago, using biomarker sea ice reconstructions from the southern Norwegian Sea. Our results document that initial sea ice reductions at the core site preceded the major reinvigoration of convective deep-water formation in the Nordic Seas and abrupt Greenland warming; sea ice expansions preceded the buildup of a deep oceanic heat reservoir. Our findings suggest that the sea ice variability shaped regime shifts between surface stratification and deep convection in the Nordic Seas during abrupt climate changes.
1.Univ Bergen, Dept Earth Sci, N-5007 Bergen, Norway 2.Univ Bergen, Bjerknes Ctr Climate Res, N-5007 Bergen, Norway 3.Bjerknes Ctr Climate Res, NORCE Norwegian Res Ctr, N-5007 Bergen, Norway 4.Univ Cambridge, Dept Geog, Cambridge CB2 3EQ, England 5.Columbia Univ, Lamont Doherty Earth Observ, 61 Route 9W,POB 1000, Palisades, NY 10964 USA 6.Alfred Wegener Inst, Helmholtz Ctr Polar & Marine, D-27568 Bremerhaven, Germany 7.Univ Bremen, MARUM, POB 330440, D-28334 Bremen, Germany 8.Univ Bremen, Fac Geosci FB 5, POB 330440, D-28334 Bremen, Germany 9.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW 2052, Australia 10.Univ New South Wales, PANGEA Res Ctr, Sydney, NSW 2052, Australia 11.Macquarie Univ, Dept Earth & Planetary Sci, Sydney, NSW, Australia 12.IBS, Ctr Climate Phys, Busan, South Korea 13.Pusan Natl Univ, Busan, South Korea
Recommended Citation:
Sadatzki, Henrik,Dokken, Trond M.,Berben, Sarah M. P.,et al. Sea ice variability in the southern Norwegian Sea during glacial Dansgaard-Oeschger climate cycles[J]. SCIENCE ADVANCES,2019-01-01,5(3)