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  • Yager, P. L.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA (author)

A carbon budget for the Amundsen Sea Polynya, Antarctica: Estimating net community production and export in a highly productive polar ecosystem

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • 2016-12-09
  • University of California Press,2016

Numbers

  • LIBRIS-ID:oai:gup.ub.gu.se/273812
  • https://gup.ub.gu.se/publication/273812URI
  • https://doi.org/10.12952/journal.elementa.000140DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-311392URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-70979URI

Supplementary language notes

  • Language:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Part of an Elementa Special Feature ASPIRE: The Amundsen Sea Polynya International Research Expedition
  • Polynyas, or recurring areas of seasonally open water surrounded by sea ice, are foci for energy and material transfer between the atmosphere and the polar ocean. They are also climate sensitive, with both sea ice extent and glacial melt influencing their productivity. The Amundsen Sea Polynya (ASP) is the greenest polynya in the Southern Ocean, with summertime chlorophyll a concentrations exceeding 20 mu g L-1. During the Amundsen Sea Polynya International Research Expedition (ASPIRE) in austral summer 2010-11, we aimed to determine the fate of this high algal productivity. We collected water column profiles for total dissolved inorganic carbon (DIC) and nutrients, particulate and dissolved organic matter, chlorophyll a, mesozoo-plankton, and microbial biomass to make a carbon budget for this ecosystem. We also measured primary and secondary production, community respiration rates, vertical particle flux and fecal pellet production and grazing. With observations arranged along a gradient of increasing integrated dissolved inorganic nitrogen drawdown (Delta DIN; 0.027-0.74 mol N m(-2)), changes in DIC in the upper water column (ranging from 0.2 to 4.7 mol C m(-2)) and gas exchange (0-1.7 mol C m(-2)) were combined to estimate early season net community production (sNCP; 0.2-5.9 mol C m(-2)) and then compared to organic matter inventories to estimate export. From a phytoplankton bloom dominated by Phaeocystis antarctica, a high fraction (up to similar to 60%) of sNCP was exported to sub-euphotic depths. Microbial respiration remineralized much of this export in the mid waters. Comparisons to short-term (2-3 days) drifting traps and a year-long moored sediment trap capturing the downward flux confirmed that a relatively high fraction (3-6%) of the export from similar to 100 m made it through the mid waters to depth. We discuss the climate-sensitive nature of these carbon fluxes, in light of the changing sea ice cover and melting ice sheets in the region.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Sherrell, R. M.Rutgers State Univ, Dept Marine & Coastal Sci, New Brunswick, NJ USA (author)
  • Stammerjohn, S. E.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA,Bangor Univ, Sch Ocean Sci, Bangor, Gwynedd, Wales,Bangor Univ, UK (author)
  • Ducklow, H. W.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA (author)
  • Schofield, O. M. E.Rutgers State Univ, Dept Marine & Coastal Sci, New Brunswick, NJ USA (author)
  • Ingall, E. D.Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA (author)
  • Wilson, S. E. (author)
  • Lowry, K. E.Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA (author)
  • Williams, C. M.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA (author)
  • Riemann, L.Univ Copenhagen, Marine Biol Sect, Helsingor, Denmark,CSIC, Inst Marine Sci, Barcelona, Spain (author)
  • Bertilsson, StefanUppsala universitet,Limnologi,Science for Life Laboratory, SciLifeLab,Uppsala University(Swepub:uu)stber839 (author)
  • Alderkamp, A. C.Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA (author)
  • Dinasquet, JulieLinnéuniversitetet,Institutionen för biologi och miljö (BOM),Univ Copenhagen, Denmark(Swepub:lnu)ediju (author)
  • Logares, R. (author)
  • Richert, IngaUppsala universitet,Limnologi,Science for Life Laboratory, SciLifeLab,Uppsala University(Swepub:uu)ingri312 (author)
  • Sipler, R. E.Coll William & Mary, Virginia Inst Marine Sci, Gloucester Pt, VA USA (author)
  • Melara, A. J.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA (author)
  • Mu, L.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA (author)
  • Newstead, R. G.Bangor Univ, Sch Ocean Sci, Bangor, Gwynedd, Wales,Bangor Univ, UK (author)
  • Post, A. F.Florida Atlantic Univ, Oceanog Inst, Harbor Branch, Boca Raton, FL 33431 USA (author)
  • Swalethorp, RasmusGothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences,Tech Univ Denmark, Sect Oceanog & Climate, Natl Inst Aquat Resources DTU Aqua, Charlottenlund, Denmark; Univ Gothenburg, Dept Biol & Environm Sci, Gothenburg, Sweden,Tech Univ Denmark, Denmark;University of Gothenburg (author)
  • van Dijken, G. L.Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA (author)
  • Univ Georgia, Dept Marine Sci, Athens, GA 30602 USARutgers State Univ, Dept Marine & Coastal Sci, New Brunswick, NJ USA (creator_code:org_t)

Related titles

  • In:Elementa-Science of the Anthropocene: University of California Press42325-1026

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