Organic carbon deposition on the North Carolina continental slope off Cape Hatteras (USA)

C. J. Thomas; N. E. Blair; M. J. Alperin; D. J. DeMaster; R. A. Jahnke; C. S. Martens; L. Mayer

doi:10.1016/S0967-0645(02)00135-2

Organic carbon deposition on the North Carolina continental slope off Cape Hatteras (USA)

C. J. Thomas, N. E. Blair, M. J. Alperin, D. J. DeMaster, R. A. Jahnke, C. S. Martens, L. Mayer

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

The continental slope off Cape Hatteras, NC is a region of high sediment accumulation and organic matter deposition. Sediment accumulation rates range from 3 to 151 cm kyr^-1. Organic carbon deposition rates are 5-13 moles Cm^-2yr^-1, the highest reported for the slope off the eastern US. Burial efficiencies are 3-40%. The organic matter deposited is marine in origin and a mix of old and young particles. High organic carbon deposition rates support remineralization throughout the upper 2-3 m of sediment. Deep bioirrigation to depths of 60-100 cm within the seabed affects the biogeochemistry of the sediments by extending the zone of sulfate reduction and by steepening DIC porewater gradients through the non-local exchange of porewater. Stable and radiocarbon isotope mixing curves for porewater dissolved inorganic carbon (DIC) indicate that the dominant source of DIC accumulating in the upper 2-3 m of the seabed is of nearly uniform δ¹³C (-21.10‰) and Δ¹⁴C (-546‰).

Original language	English (US)
Pages (from-to)	4687-4709
Number of pages	23
Journal	Deep-Sea Research Part II: Topical Studies in Oceanography
Volume	49
Issue number	20
DOIs	https://doi.org/10.1016/S0967-0645(02)00135-2
State	Published - 2002

ASJC Scopus subject areas

Oceanography

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10.1016/S0967-0645(02)00135-2

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@article{37708f1c03494df58b006d2ca54d8010,

title = "Organic carbon deposition on the North Carolina continental slope off Cape Hatteras (USA)",

abstract = "The continental slope off Cape Hatteras, NC is a region of high sediment accumulation and organic matter deposition. Sediment accumulation rates range from 3 to 151 cm kyr-1. Organic carbon deposition rates are 5-13 moles Cm-2yr-1, the highest reported for the slope off the eastern US. Burial efficiencies are 3-40%. The organic matter deposited is marine in origin and a mix of old and young particles. High organic carbon deposition rates support remineralization throughout the upper 2-3 m of sediment. Deep bioirrigation to depths of 60-100 cm within the seabed affects the biogeochemistry of the sediments by extending the zone of sulfate reduction and by steepening DIC porewater gradients through the non-local exchange of porewater. Stable and radiocarbon isotope mixing curves for porewater dissolved inorganic carbon (DIC) indicate that the dominant source of DIC accumulating in the upper 2-3 m of the seabed is of nearly uniform δ13C (-21.10‰) and Δ14C (-546‰).",

author = "Thomas, {C. J.} and Blair, {N. E.} and Alperin, {M. J.} and DeMaster, {D. J.} and Jahnke, {R. A.} and Martens, {C. S.} and L. Mayer",

note = "Funding Information: We thank R. Aller, M., D. Beauregard, W. Fornes, M. Green, H. Mendlovitz, G. Plaia, R. Pope, K. Perdue, and D. Zhu for their hard work during cruises and in the laboratory. The authors also thank the captains and crews of the R.V. Cape Hatteras, R.V. Seaward Johnson and R.V. Edwin Link. Helpful comments were provided by L. Cahoon, W. Fornes, R. Pope, W. Savidge and three anonymous reviewers on an early draft of this manuscript. This study was funded by grants from DOE and NSF.",

year = "2002",

doi = "10.1016/S0967-0645(02)00135-2",

language = "English (US)",

volume = "49",

pages = "4687--4709",

journal = "Deep-Sea Research Part II: Topical Studies in Oceanography",

issn = "0967-0645",

publisher = "Elsevier Limited",

number = "20",

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T1 - Organic carbon deposition on the North Carolina continental slope off Cape Hatteras (USA)

AU - Thomas, C. J.

AU - Blair, N. E.

AU - Alperin, M. J.

AU - DeMaster, D. J.

AU - Jahnke, R. A.

AU - Martens, C. S.

AU - Mayer, L.

N1 - Funding Information: We thank R. Aller, M., D. Beauregard, W. Fornes, M. Green, H. Mendlovitz, G. Plaia, R. Pope, K. Perdue, and D. Zhu for their hard work during cruises and in the laboratory. The authors also thank the captains and crews of the R.V. Cape Hatteras, R.V. Seaward Johnson and R.V. Edwin Link. Helpful comments were provided by L. Cahoon, W. Fornes, R. Pope, W. Savidge and three anonymous reviewers on an early draft of this manuscript. This study was funded by grants from DOE and NSF.

PY - 2002

Y1 - 2002

N2 - The continental slope off Cape Hatteras, NC is a region of high sediment accumulation and organic matter deposition. Sediment accumulation rates range from 3 to 151 cm kyr-1. Organic carbon deposition rates are 5-13 moles Cm-2yr-1, the highest reported for the slope off the eastern US. Burial efficiencies are 3-40%. The organic matter deposited is marine in origin and a mix of old and young particles. High organic carbon deposition rates support remineralization throughout the upper 2-3 m of sediment. Deep bioirrigation to depths of 60-100 cm within the seabed affects the biogeochemistry of the sediments by extending the zone of sulfate reduction and by steepening DIC porewater gradients through the non-local exchange of porewater. Stable and radiocarbon isotope mixing curves for porewater dissolved inorganic carbon (DIC) indicate that the dominant source of DIC accumulating in the upper 2-3 m of the seabed is of nearly uniform δ13C (-21.10‰) and Δ14C (-546‰).

AB - The continental slope off Cape Hatteras, NC is a region of high sediment accumulation and organic matter deposition. Sediment accumulation rates range from 3 to 151 cm kyr-1. Organic carbon deposition rates are 5-13 moles Cm-2yr-1, the highest reported for the slope off the eastern US. Burial efficiencies are 3-40%. The organic matter deposited is marine in origin and a mix of old and young particles. High organic carbon deposition rates support remineralization throughout the upper 2-3 m of sediment. Deep bioirrigation to depths of 60-100 cm within the seabed affects the biogeochemistry of the sediments by extending the zone of sulfate reduction and by steepening DIC porewater gradients through the non-local exchange of porewater. Stable and radiocarbon isotope mixing curves for porewater dissolved inorganic carbon (DIC) indicate that the dominant source of DIC accumulating in the upper 2-3 m of the seabed is of nearly uniform δ13C (-21.10‰) and Δ14C (-546‰).

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JO - Deep-Sea Research Part II: Topical Studies in Oceanography

JF - Deep-Sea Research Part II: Topical Studies in Oceanography

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ER -

Organic carbon deposition on the North Carolina continental slope off Cape Hatteras (USA)

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