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Ocean processes at the Antarctic continental slope.

Karen J Heywood1, Sunke Schmidtko2, Céline Heuzé2

  • 1Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, Norwich NR4 7TJ, UK k.heywood@uea.ac.uk.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|June 4, 2014
PubMed
Summary

Ocean gliders provide crucial data on Antarctic shelf-slope dynamics, improving climate models. These tools reveal small-scale processes vital for Southern Ocean nutrient cycling and global climate regulation.

Keywords:
Antarctic Slope FrontAntarctic continental shelfclimate modeliron fertilizationocean gliderwater mass

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Area of Science:

  • * Physical Oceanography
  • * Biogeochemical Cycling
  • * Climate Modeling

Background:

  • * Antarctic continental shelves and slopes are critical for global climate and biogeochemical cycles, influencing deep water formation and heat flux.
  • * Current climate models struggle to accurately represent physical processes and water mass properties in this region due to the small spatial scales involved.
  • * Cross-slope exchange processes are vital for nutrient transport, particularly iron, from the continental shelf to the Southern Ocean's mixed layer.

Purpose of the Study:

  • * To investigate the dynamics and biogeochemical significance of small-scale processes at the Antarctic continental shelf break.
  • * To assess the utility of ocean gliders for observing these challenging environments.
  • * To improve the understanding of water mass transformation and nutrient fluxes in the Southern Ocean.

Main Methods:

  • * Deployment of three Seagliders as part of the Gliders: Excellent New Tools for Observing the Ocean (GENTOO) project.
  • * Collection of high-resolution oceanographic data east of the Antarctic Peninsula for up to two months.
  • * Utilizing an iron-cycling model integrated with an eddy-permitting ocean model to analyze sedimentary iron's role.

Main Results:

  • * Glider data successfully resolved small-scale exchange processes across the Antarctic Slope Front.
  • * The study identified the biogeochemical signature of the Antarctic Slope Front.
  • * Sedimentary iron was shown to be important for fertilizing parts of the Southern Ocean.

Conclusions:

  • * Ocean gliders are effective tools for observing small-scale oceanographic processes in the Antarctic.
  • * The GENTOO project demonstrated gliders' potential role in future Southern Ocean observing systems.
  • * Improved understanding of shelf-break dynamics is crucial for accurate climate modeling.