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Recycling and burial of organic carbon in sediments of the Porcupine Abyssal Plain, NE Atlantic
- Ståhl, H. (author)
-
- Tengberg, Anders, 1962 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
-
- Brunnegård, Jenny, 1973 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
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- (creator_code:org_t)
- 2004
- 2004
- English.
- In: Deep-Sea Research Part I-Oceanographic Research Papers. ; 51:6, s. 777-791
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Rates of degradation, recycling and burial of organic carbon (OC) and their temporal and spatial variability were investigated in deep-sea sediments of the Porcupine Abyssal Plain (PAP) in the Northeast Atlantic Ocean (depth 4800-4850 m) during six cruises in August 1996-April 1999. Benthic fluxes of total dissolved inorganic carbon (C-T) and alkalinity (A(T)) were measured in situ using benthic chambers of a free-vehicle benthic lander on four of the cruises. To obtain the OC oxidation rate (C-ox), the C-T flux in each chamber was corrected for CaCO3 dissolution. Burial of OC was determined by using downcore profiles of OC (n = 20) in the solid phase of the sediment and sediment accumulation rates estimated from a model age based on C-14 dating of foraminifera. Results obtained showed that during 1996-1999 C-ox rates in PAP sediments varied between deployments from 0.21 +/- 0.04 to 0.86 +/- 0.23 mmol m(-2) d(-1) with a total mean of 0.46 mmol m(-2) d(-1) (SD +/- 0.37, n = 31). No statistically significant spatial (between stations) or temporal (seasonal as well as interannual) variation in the C-ox rates could be detected during the sampling period. The mean burial rate was determined to be 0.03 +/- 0.01 mmol m(-2) d(-1). On average over the sampling period, similar to94% of the particulate organic carbon (POC) deposited was recycled as C-T to the overlying water and similar to6% was buried. The calculated mean POC demand during 1996-1999 of 0.49 +/- 0.37 mmol m(-2) d(-1) (the sum of corrected C-T and burial fluxes) was not significantly different from the annual integrated mean POC supply (1997-1999) of 0.24 +/- 0.06 mmol m(-2) d(-1) estimated from calibrated sediment traps 1800 mab at the same locality. (C) 2004 Elsevier Ltd. All rights reserved.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- NE Atlantic
- Porcupine Abyssal Plain
- deep-sea sediments
- organic
- carbon
- benthic fluxes
- recycling
- oxygen demand
- seasonality
- burial
- benthic lander
- EUROPEAN CONTINENTAL-MARGIN
- EASTERN NORTH PACIFIC
- COMMUNITY
- OXYGEN-CONSUMPTION
- BIOGENIC PARTICLE FLUXES
- DEEP-SEA SEDIMENTS
- GOBAN
- SPUR
- NORTHEASTERN ATLANTIC
- SEASONAL DEPOSITION
- INSITU MEASUREMENTS
- INORGANIC CARBON
Publication and Content Type
- ref (subject category)
- art (subject category)
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