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ASPIRE

ASPIRE. Amundsen Sea Polynya International Research Expedition. ASPIRE. Amundsen Sea Polynya International Research Expedition. A regularly occurring polynya just off the Dotson Ice Shelf. http://www.ldeo.columbia.edu/~sharons/animAS_bymon.html. ASPIRE. Arrigo & Dikjen 2003.

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ASPIRE

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  1. ASPIRE Amundsen Sea Polynya International Research Expedition

  2. ASPIRE Amundsen Sea Polynya International Research Expedition

  3. A regularly occurring polynya just off the Dotson Ice Shelf http://www.ldeo.columbia.edu/~sharons/animAS_bymon.html ASPIRE

  4. Arrigo & Dikjen 2003 • Fourth largest Antarctic polynya • Highest peak and seasonally averaged chla concentration • Greatest primary productivity per unit area • Greatest interannual variability - WHY? ASPIRE

  5. Project Objectives: Use inter-annual and spatial variability to elucidate climate-sensitive mechanisms directing carbon fluxes in this region. ASPIRE Focus on physical (light, mixed-layer) and chemical (micro-nutrient) mechanisms controlling the duration, timing, and community structure of the phytoplankton bloom Determine controls on the fate of that production (zooplankton, microheterotrophy, particle flux)

  6. Trace Metals (Rob Sherrell / Per Anderson / Silke Severmann / Kuria Ndungu) Dissolved and particulate Fe, Mn, Zn, Cu, No, Co, Cd, V, Mo, Ca, P, Corg, Norg, Ba, Al, Sc, T, Yb, Pb, REE TMC CTD/rosette, Towed fish, in situ pumps Phytoplankton Abundance and Physiology (Oscar Schofield) Physiology: Fluorescence Induction Relaxation (FIRE; Fv/Fm); 14C-bicarb incubation Webb Slocum Glider (CTD/ Ecopucks: spectral backscatter, chla fluor, CDOM) Zooplankton (Kajsa Tonnesson) Abundance, grazing rates, prey preference, pellet production Particle dynamics and sedimentation (Hugh Ducklow / Per Anderson) Moored sediment trap, dissolved and particulate 234Th , floating sediment trap Microbial heterotrophy (Patricia Yager / Stefan Bertilsson / Lasse Riemann) Free- and particulate bacterial and Archaeal abundance, production, respiration, community structure, exoenzymes, viral abundance, viral shunt, chemoautotrophy, bacterivory Carbonate system (Melissa Chierici / Agneta Fransson / Patricia Yager) Underway surface pCO2, DIC, ALK, pH Physical Oceanography (Goran Bjork / Anna Wahlin / Lars Arneborg) Water masses (especially CDW); CTD hydrography; conventional CTD/rosette Ice-Ocean Atmosphere Interactions, data synthesis, modeling (Sharon Stammerjohn) Large-scale ice-atmosphere variability, surface water properties, stratification, CDW Ice-algal growth model, single-column KPP upper ocean mixing model with biogeochem ASPIRE

  7. Proposed cruise track within the Amundsen Sea Polynya: Three transects and two 3-day drifting time series stations 14 days in the polynya ASPIRE Sediment trap placed in area open for longest time

  8. 2003 Heavy Heavy (100%) 2007 Heavy Heavy Heavy 2008 ~50% ~50% Heavy Examples of December sea ice conditions and ‘quickest’ routes to AS polynya ~4 days ~5 days ~4 days • Sea Ice Image overlaid on land/bathymetry masks: • Continental Ice is light/dark: grey (under ice image) • Continental shelf: slightly shaded (under ice image) • Open water: black • Sea ice 100%: white • Sea ice ~50%: light blue

  9. ASPIRE

  10. Priorities for NBP: 1. Into the polynya as soon as possible 2. Deploy mooring and glider first 3. Two 3-day drifting experimental transects 4. Three cross-polynya transects (~25 nm station resolution) 5. Ice-shelf front: inputs to polynya 5. Trough sampling: inputs to polynya 6. Pine Island Polynya (depending on ice) ASPIRE

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