globalchange  > 气候减缓与适应
DOI: 10.1038/NGEO2421
论文题名:
High rates of organic carbon burial in fjord sediments globally
作者: Smith R.W.; Bianchi T.S.; Allison M.; Savage C.; Galy V.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期:6
起始页码: 450
结束页码: 453
语种: 英语
Scopus关键词: biogenic deposit ; burial (geology) ; carbon sequestration ; concentration (composition) ; estuarine environment ; fjord ; glacial-interglacial cycle ; global ocean ; marine sediment ; organic carbon ; sediment chemistry ; sediment core
英文摘要: The deposition and long-termburial of organic carbon in marine sediments has played a key role in controlling atmospheric O2 and CO2 concentrations over the past 500 million years1. Marine carbon burial represents the dominant natural mechanism of long-term organic carbon sequestration1,2. Fjords-deep, glacially carved estuaries at high latitudes-have been hypothesized to be hotspots of organic carbon burial, because they receive high rates of organic material fluxes from the watershed3. Here we compile organic carbon concentrations from 573 fjord surface sediment samples and 124 sediment cores from nearly all fjord systems globally. We use sediment organic carbon content and sediment delivery rates to calculate rates of organic carbon burial in fjord systems across the globe. We estimate that about 18 Mt of organic carbon are buried in fjord sediments each year, equivalent to 11% of annual marine carbon burial globally4. Per unit area, fjord organic carbon burial rates are one hundred times as large as the global ocean average, and fjord sediments contain twice as much organic carbon as biogenous sediments underlying the upwelling regions of the ocean1. We conclude that fjords may play an important role in climate regulation on glacial-interglacial timescales. © 2015 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106184
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: Global Aquatic Research (GAR) LLC, Sodus, NY, United States; Department of Marine Sciences, University of Connecticut, Groton, CT, United States; Department of Geological Sciences, University of Florida, Gainesville, FL, United States; University of Texas, Department of Geological Sciences, Austin, TX, United States; University of Otago, Department of Marine Science, Dunedin, New Zealand; University of Cape Town, Department of Biological Sciences, Cape Town, South Africa; Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States; Water Institute of the Gulf, Baton Rouge, LA, United States; Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA, United States

Recommended Citation:
Smith R.W.,Bianchi T.S.,Allison M.,et al. High rates of organic carbon burial in fjord sediments globally[J]. Nature Geoscience,2015-01-01,8(6)
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