globalchange  > 气候减缓与适应
DOI: 10.1038/s41561-018-0069-9
论文题名:
Export of nutrient rich Northern Component Water preceded early Oligocene Antarctic glaciation /704/106/413 /704/829 /704/106/2738 article
作者: Coxall H.K.; Huck C.E.; Huber M.; Lear C.H.; Legarda-Lisarri A.; O'Regan M.; Sliwinska K.K.; Van De Flierdt T.; De Boer A.M.; Zachos J.C.; Backman J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期:3
起始页码: 190
结束页码: 196
语种: 英语
英文摘要: The onset of the North Atlantic Deep Water formation is thought to have coincided with Antarctic ice-sheet growth about 34 million years ago (Ma). However, this timing is debated, in part due to questions over the geochemical signature of the ancient Northern Component Water (NCW) formed in the deep North Atlantic. Here we present detailed geochemical records from North Atlantic sediment cores located close to sites of deep-water formation. We find that prior to 36 Ma, the northwestern Atlantic was stratified, with nutrient-rich, low-salinity bottom waters. This restricted basin transitioned into a conduit for NCW that began flowing southwards approximately one million years before the initial Antarctic glaciation. The probable trigger was tectonic adjustments in subarctic seas that enabled an increased exchange across the Greenland-Scotland Ridge. The increasing surface salinity and density strengthened the production of NCW. The late Eocene deep-water mass differed in its carbon isotopic signature from modern values as a result of the leakage of fossil carbon from the Arctic Ocean. Export of this nutrient-laden water provided a transient pulse of CO2 to the Earth system, which perhaps caused short-term warming, whereas the long-term effect of enhanced NCW formation was a greater northward heat transport that cooled Antarctica. © 2018 The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105605
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom; Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN, United States; Institute for the Study of Earth Oceans, University of New Hampshire, Durham, NH, United States; School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom; Department of Earth Sciences, University of Zaragoza, Zaragoza, Spain; Geological Survey of Denmark and Greenland, GEUS, Copenhagen K, Denmark; Department of Marine Organic Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, Texel, Netherlands; Earth and Planetary Sciences Department, University of California, Santa Cruz, United States

Recommended Citation:
Coxall H.K.,Huck C.E.,Huber M.,et al. Export of nutrient rich Northern Component Water preceded early Oligocene Antarctic glaciation /704/106/413 /704/829 /704/106/2738 article[J]. Nature Geoscience,2018-01-01,11(3)
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