ASPIRE Amundsen Sea Polynya International Research Expedition.

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Presentation transcript:

ASPIRE Amundsen Sea Polynya International Research Expedition

ASPIRE Amundsen Sea Polynya International Research Expedition

l A regularly occurring polynya just off the Dotson Ice Shelf ASPIRE

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

Project Objectives: Use inter-annual and spatial variability to elucidate climate- sensitive mechanisms directing carbon fluxes in this region. 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) ASPIRE

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

2003 Heavy (100%) Heavy 2008 ~50% Heavy~50% 2007 Heavy Examples of December sea ice conditions and ‘quickest’ routes to AS polynya 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 ~4 days ~5 days

ASPIRE

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)