期刊
SCIENCE
卷 349, 期 6249, 页码 706-710出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa9554
关键词
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资金
- WHOI Ocean and Climate Change Institute (OCCI) scholarship
- OCCI grant [27071264]
- WHOI OCCI
- NSF [OIA-1124880, OCE-1357121, ANT-1246387]
- WHOI J. Lamar Worzel Assistant Scientist Fund
- Penzance Endowed Fund in Support of Assistant Scientists
- European Union's Seventh Framework Programme for Research [298513]
- Australian Research Council [DP140101393]
- Natural Environment Research Council [NE/J008133/1]
- NERC [NE/J008133/1] Funding Source: UKRI
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1246387] Funding Source: National Science Foundation
- Natural Environment Research Council [NE/J008133/1] Funding Source: researchfish
Changes in the formation of dense water in the Arctic Ocean and Nordic Seas [the Arctic Mediterranean (AM)] probably contributed to the altered climate of the last glacial period. We examined past changes in AM circulation by reconstructing radiocarbon ventilation ages of the deep Nordic Seas over the past 30,000 years. Our results show that the glacial deep AM was extremely poorly ventilated (ventilation ages of up to 10,000 years). Subsequent episodic overflow of aged water into the mid-depth North Atlantic occurred during deglaciation. Proxy data also suggest that the deep glacial AM was similar to 2 degrees to 3 degrees C warmer than modern temperatures; deglacial mixing of the deep AM with the upper ocean thus potentially contributed to the melting of sea ice, icebergs, and terminal ice-sheet margins.
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