• shareshare
  • link
  • cite
  • add
Powered by OpenAIRE graph
Found an issue? Give us feedback
auto_awesome_motion View all 2 versions
Publication . Article . 2012

Oceanic controls on the primary production of the northwest European continental shelf: model experiments under recent past conditions and a potential future scenario

Jason Holt; Momme Butenschön; Sarah Wakelin; Yuri Artioli; Julian Icarus Allen;
Open Access
Published: 06 Jan 2012 Journal: Biogeosciences, volume 9, issue 1, pages 97-117 (issn: 1726-4170, eissn: 1726-4189, Copyright policy )
Publisher: Copernicus Publications

Abstract. In this paper we clearly demonstrate that changes in oceanic nutrients are a first order factor in determining changes in the primary production of the northwest European continental shelf on time scales of 5–10 yr. We present a series of coupled hydrodynamic ecosystem modelling simulations, using the POLCOMS-ERSEM system. These are forced by both reanalysis data and a single example of a coupled ocean-atmosphere general circulation model (OA-GCM) representative of possible conditions in 2080–2100 under an SRES A1B emissions scenario, along with the corresponding present day control. The OA-GCM forced simulations show a substantial reduction in surface nutrients in the open-ocean regions of the model domain, comparing future and present day time-slices. This arises from a large increase in oceanic stratification. Tracer transport experiments identify a substantial fraction of on-shelf water originates from the open-ocean region to the south of the domain, where this increase is largest, and indeed the on-shelf nutrient and primary production are reduced as this water is transported on-shelf. This relationship is confirmed quantitatively by comparing changes in winter nitrate with total annual nitrate uptake. The reduction in primary production by the reduced nutrient transport is mitigated by on-shelf processes relating to temperature, stratification (length of growing season) and recycling. Regions less exposed to ocean-shelf exchange in this model (Celtic Sea, Irish Sea, English Channel, and Southern North Sea) show a modest increase in primary production (of 5–10%) compared with a decrease of 0–20% in the outer shelf, Central and Northern North Sea. These findings are backed up by a boundary condition perturbation experiment and a simple mixing model.

Subjects by Vocabulary

Library of Congress Subject Headings: lcsh:Ecology lcsh:QH540-549.5 lcsh:Life lcsh:QH501-531 lcsh:Geology lcsh:QE1-996.5

Microsoft Academic Graph classification: Oceanography Nitrate chemistry.chemical_compound chemistry Growing season Present day Continental shelf geography.geographical_feature_category geography TRACER Nutrient Stratification (water) Ecosystem


Earth-Surface Processes, Ecology, Evolution, Behavior and Systematics

Related Organizations
Powered by OpenAIRE graph
Found an issue? Give us feedback
Download fromView all 3 sources
Article . 2012
Data sources: DOAJ-Articles