Seasonal organic matter dynamics in a temperate shelf sea

Davis, C, Blackbird, S, Wolff, GA, Sharples, J, Woodward, EMS and Mahaffey, C 2019 Seasonal organic matter dynamics in a temperate shelf sea. Progress in Oceanography.

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Organic matter (OM) plays an important role in productive shelf seas and their contribution to global carbon (C) and nutrient cycles. We investigated dissolved and particulate OM (DOM and POM, respectively) dynamics over a seasonal cycle in the Celtic Sea. The quantity of OC was largest during the spring bloom and lowest in autumn. DOM was always C rich relative to the POM pool and the Redfield ratio (106C:16N:P). There was clear decoupling between C, N and P and the response of OM composition to different seasons and nutrient statuses of the microbial community. The C:P stoichiometry was much more variable than the C:N stoichiometry, which was near constant. Downward OC fluxes were dominated by POM during bloom events and DOM during the stratified summer. In terms of partitioning, 92–96% of OC was in the DOM pool throughout sampling, which given its high C:N (12.4–17) suggests it was an efficient vehicle for potential off-shelf export of C during winter mixing.

Item Type: Publication - Article
Subjects: Chemistry
Marine Sciences
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: Malcolm Woodward
Date made live: 03 Jul 2018 11:22
Last Modified: 25 Apr 2020 09:59

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