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

Felipe S Freitas1,2, Katharine R Hendry1, Sian F Henley3

  • 1School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|September 1, 2020
PubMed
Summary
This summary is machine-generated.

Climate change impacts the Barents Sea, altering ocean conditions and sea ice. This study quantifies organic matter processing, revealing seafloor heterogeneity drives reactivity, not sea ice extent.

Keywords:
continental shelfdegradation ratesnutrient fluxesorganic matter reactivityreaction-transport modelseafloor

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Area of Science:

  • Marine Geochemistry
  • Arctic Oceanography
  • Ecosystem Functioning

Background:

  • The Barents Sea, a crucial Arctic region for primary productivity, faces significant climate-driven changes.
  • Oceanographic shifts and sea ice loss threaten ecosystem stability.
  • Understanding benthic-pelagic coupling is vital for predicting climate change impacts.

Purpose of the Study:

  • To quantify organic matter processing in the Barents Sea.
  • To identify the key drivers of organic matter reactivity and burial.
  • To establish a baseline for seafloor geochemistry under changing Arctic conditions.

Main Methods:

  • Combined field observations with a reaction-transport model.
  • Analyzed sedimentary organic matter reactivity patterns.
  • Quantified degradation rates and nutrient fluxes (ammonium, phosphate).

Main Results:

  • Seafloor spatial heterogeneity, not sea ice extent, primarily controls sedimentary organic matter reactivity.
  • High reactivity, marine-derived organic matter burial is linked to Atlantic Water influence.
  • Low reactivity organic matter is associated with terrestrial inputs on the central shelf.
  • Aerobic respiration dominates degradation (40-75%), with higher rates where reactive material is buried.
  • Increased ammonium and phosphate fluxes observed at sites with buried reactive material.

Conclusions:

  • Seafloor geochemistry is primarily driven by local conditions and water mass influence, not sea ice extent.
  • The Atlantic Water-influenced shelf may foreshadow future Barents Sea conditions.
  • Results provide a baseline for anticipating pan-Arctic ecosystem changes due to persistent climate perturbations.