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The impact of sedimentary alkalinity release on the water column CO2 system in the North Sea

Heiko Brenner, Ulrike Braeckman (UGent) , Marie Le Guitton and Filip JR Meysman
(2016) BIOGEOSCIENCES. 13(3). p.841-863
Author
Organization
Abstract
It has been previously proposed that alkalinity release from sediments can play an important role in the carbonate dynamics on continental shelves, lowering the pCO(2) of seawater and hence increasing the CO2 uptake from the atmosphere. To test this hypothesis, sedimentary alkalinity generation was quantified within cohesive and permeable sediments across the North Sea during two cruises in September 2011 (basin-wide) and June 2012 (Dutch coastal zone). Benthic fluxes of oxygen (O-2), alkalinity (A(T)) and dissolved inorganic carbon (DIC) were determined using shipboard closed sediment incubations. Our results show that sediments can form an important source of alkalinity for the overlying water, particularly in the shallow southern North Sea, where high A(T) and DIC fluxes were recorded in near-shore sediments of the Belgian, Dutch and German coastal zone. In contrast, fluxes of A(T) and DIC are substantially lower in the deeper, seasonally stratified, northern part of the North Sea. Based on the data collected, we performed a model analysis to constrain the main pathways of alkalinity generation in the sediment, and to quantify how sedimentary alkalinity drives atmospheric CO2 uptake in the southern North Sea. Overall, our results show that sedimentary alkalinity generation should be regarded as a key component in the CO2 dynamics of shallow coastal systems.
Keywords
DISSOLVED INORGANIC CARBON, GERMAN BIGHT, COASTAL MARINE SEDIMENT, BENTHIC OXYGEN FLUXES, LONG-TERM CHANGES, CONTINENTAL-SHELF, PORE-WATER, DENITRIFICATION RATES, ATMOSPHERIC CO2, ORGANIC-CARBON

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Citation

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MLA
Brenner, Heiko, et al. “The Impact of Sedimentary Alkalinity Release on the Water Column CO2 System in the North Sea.” BIOGEOSCIENCES, vol. 13, no. 3, 2016, pp. 841–63, doi:10.5194/bg-13-841-2016.
APA
Brenner, H., Braeckman, U., Le Guitton, M., & Meysman, F. J. (2016). The impact of sedimentary alkalinity release on the water column CO2 system in the North Sea. BIOGEOSCIENCES, 13(3), 841–863. https://doi.org/10.5194/bg-13-841-2016
Chicago author-date
Brenner, Heiko, Ulrike Braeckman, Marie Le Guitton, and Filip JR Meysman. 2016. “The Impact of Sedimentary Alkalinity Release on the Water Column CO2 System in the North Sea.” BIOGEOSCIENCES 13 (3): 841–63. https://doi.org/10.5194/bg-13-841-2016.
Chicago author-date (all authors)
Brenner, Heiko, Ulrike Braeckman, Marie Le Guitton, and Filip JR Meysman. 2016. “The Impact of Sedimentary Alkalinity Release on the Water Column CO2 System in the North Sea.” BIOGEOSCIENCES 13 (3): 841–863. doi:10.5194/bg-13-841-2016.
Vancouver
1.
Brenner H, Braeckman U, Le Guitton M, Meysman FJ. The impact of sedimentary alkalinity release on the water column CO2 system in the North Sea. BIOGEOSCIENCES. 2016;13(3):841–63.
IEEE
[1]
H. Brenner, U. Braeckman, M. Le Guitton, and F. J. Meysman, “The impact of sedimentary alkalinity release on the water column CO2 system in the North Sea,” BIOGEOSCIENCES, vol. 13, no. 3, pp. 841–863, 2016.
@article{7170660,
  abstract     = {{It has been previously proposed that alkalinity release from sediments can play an important role in the carbonate dynamics on continental shelves, lowering the pCO(2) of seawater and hence increasing the CO2 uptake from the atmosphere. To test this hypothesis, sedimentary alkalinity generation was quantified within cohesive and permeable sediments across the North Sea during two cruises in September 2011 (basin-wide) and June 2012 (Dutch coastal zone). Benthic fluxes of oxygen (O-2), alkalinity (A(T)) and dissolved inorganic carbon (DIC) were determined using shipboard closed sediment incubations. Our results show that sediments can form an important source of alkalinity for the overlying water, particularly in the shallow southern North Sea, where high A(T) and DIC fluxes were recorded in near-shore sediments of the Belgian, Dutch and German coastal zone. In contrast, fluxes of A(T) and DIC are substantially lower in the deeper, seasonally stratified, northern part of the North Sea. Based on the data collected, we performed a model analysis to constrain the main pathways of alkalinity generation in the sediment, and to quantify how sedimentary alkalinity drives atmospheric CO2 uptake in the southern North Sea. Overall, our results show that sedimentary alkalinity generation should be regarded as a key component in the CO2 dynamics of shallow coastal systems.}},
  author       = {{Brenner, Heiko and Braeckman, Ulrike and Le Guitton, Marie and Meysman, Filip JR}},
  issn         = {{1726-4170}},
  journal      = {{BIOGEOSCIENCES}},
  keywords     = {{DISSOLVED INORGANIC CARBON,GERMAN BIGHT,COASTAL MARINE SEDIMENT,BENTHIC OXYGEN FLUXES,LONG-TERM CHANGES,CONTINENTAL-SHELF,PORE-WATER,DENITRIFICATION RATES,ATMOSPHERIC CO2,ORGANIC-CARBON}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{841--863}},
  title        = {{The impact of sedimentary alkalinity release on the water column CO2 system in the North Sea}},
  url          = {{http://doi.org/10.5194/bg-13-841-2016}},
  volume       = {{13}},
  year         = {{2016}},
}
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