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Oxygen dynamics in shelf seas sediments incorporating seasonal variability

Hicks, N and Ubbara, GR and Silburn, B and Smith, HEK and Kröger, S and Parker, ER and Sivyer, D and Kitidis, V and Hatton, A and Mayor, DJ and Stahl, H (2017) 'Oxygen dynamics in shelf seas sediments incorporating seasonal variability.' Biogeochemistry, 135 (1-2). 35 - 47. ISSN 0168-2563

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Abstract

Shelf sediments play a vital role in global biogeochemical cycling and are particularly important areas of oxygen consumption and carbon mineralisation. Total benthic oxygen uptake, the sum of diffusive and faunal mediated uptake, is a robust proxy to quantify carbon mineralisation. However, oxygen uptake rates are dynamic, due to the diagenetic processes within the sediment, and can be spatially and temporally variable. Four benthic sites in the Celtic Sea, encompassing gradients of cohesive to permeable sediments, were sampled over four cruises to capture seasonal and spatial changes in oxygen dynamics. Total oxygen uptake (TOU) rates were measured through a suite of incubation experiments and oxygen microelectrode profiles were taken across all four benthic sites to provide the oxygen penetration depth and diffusive oxygen uptake (DOU) rates. The difference between TOU and DOU allowed for quantification of the fauna mediated oxygen uptake and diffusive uptake. High resolution measurements showed clear seasonal and spatial trends, with higher oxygen uptake rates measured in cohesive sediments compared to the permeable sediment. The significant differences in oxygen dynamics between the sediment types were consistent between seasons, with increasing oxygen consumption during and after the phytoplankton bloom. Carbon mineralisation in shelf sediments is strongly influenced by sediment type and seasonality.

Item Type: Article
Uncontrolled Keywords: Oxygen consumption, Benthic carbon cycling, Total oxygen uptake, Shelf sea, Benthic biogeochemistry, Benthic mineralisation
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Elements
Date Deposited: 03 Apr 2019 13:04
Last Modified: 03 Sep 2019 16:15
URI: http://repository.essex.ac.uk/id/eprint/24397

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