Benthic-pelagic coupling in the Barents Sea: an integrated data-model framework.

https://arctichealth.org/en/permalink/ahliterature304883
Source
Philos Trans A Math Phys Eng Sci. 2020 Oct 02; 378(2181):20190359
Publication Type
Journal Article
Date
Oct-02-2020
Author
Felipe S Freitas
Katharine R Hendry
Sian F Henley
Johan C Faust
Allyson C Tessin
Mark A Stevenson
Geoffrey D Abbott
Christian März
Sandra Arndt
Author Affiliation
School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK.
Source
Philos Trans A Math Phys Eng Sci. 2020 Oct 02; 378(2181):20190359
Date
Oct-02-2020
Language
English
Publication Type
Journal Article
Abstract
The Barents Sea is experiencing long-term climate-driven changes, e.g. modification in oceanographic conditions and extensive sea ice loss, which can lead to large, yet unquantified disruptions to ecosystem functioning. This key region hosts a large fraction of Arctic primary productivity. However, processes governing benthic and pelagic coupling are not mechanistically understood, limiting our ability to predict the impacts of future perturbations. We combine field observations with a reaction-transport model approach to quantify organic matter (OM) processing and disentangle its drivers. Sedimentary OM reactivity patterns show no gradients relative to sea ice extent, being mostly driven by seafloor spatial heterogeneity. Burial of high reactivity, marine-derived OM is evident at sites influenced by Atlantic Water (AW), whereas low reactivity material is linked to terrestrial inputs on the central shelf. Degradation rates are mainly driven by aerobic respiration (40-75%), being greater at sites where highly reactive material is buried. Similarly, ammonium and phosphate fluxes are greater at those sites. The present-day AW-dominated shelf might represent the future scenario for the entire Barents Sea. Our results represent a baseline systematic understanding of seafloor geochemistry, allowing us to anticipate changes that could be imposed on the pan-Arctic in the future if climate-driven perturbations persist. This article is part of the theme issue 'The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning'.
PubMed ID
32862804 View in PubMed
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