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Climate, ocean circulation & sea level

Climate, ocean circulation & sea level. SAMS Main elements Leader. Arctic and boreal seas in a rapidly changing climate Past and present variability in the northern limb of the MOC (WP 1.5) Effect of climate change on the Arctic marine system (WP 1.6)

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Climate, ocean circulation & sea level

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  1. Climate, ocean circulation & sea level SAMS Main elements Leader • Arctic and boreal seas in a • rapidly changing climate • Past and present variability in the northern limb of the MOC (WP 1.5) • Effect of climate change on the Arctic marine system (WP 1.6) • Ray Leakeyray.leakey@sams.ac.uk Theme 1

  2. Past and present variability in the northern limb of the MOC Sediment palaeo-record to inform on history Meridional Overturning Circulation

  3. The effects of changing sea-ice on Arctic marine ecosystem and biogenic carbon cycle Arctic is warmer and less saline = less extensive and thinner ice What are the consequences for Arctic food webs and carbon flux ?

  4. Air-Sea Exchange Microbial Activity Light & Nutrients Grazing C:Chl ratio Nutrient Regeneration Carbon Flux Carbon Export Key Processes Where Further Understanding Required for Modelling Arctic Carbon Flow Sea-Ice Microbial Loop Primary Production Higher Predators Zooplankton Benthos

  5. WP 1.5 & 1.6 Field Observations and Experiments • Two research cruises (2008 and 2010) to marginal ice zone north of Svalbard: • Observations: • Physical parameter – sea-ice and water column • Sea-ice, pelagic and benthic communities • Sea-ice, pelagic and benthic biogeochemical parameters • Sediment core palaeoceanographic record (Piston coring) • Experiments: • Metazoan versus protozoan grazing • Temperature/nutrient co-limitation of microbial production • Benthic boundary layer nutrient fluxes using in situ landers • Comparison of open, marginal ice zone (MIZ) and ice covered waters • as in 2008 • 2009 Greater emphasis on sea-ice processes, piston coring and early summer processes

  6. Leg 1: UK to Longyearbyen (Svalbard) Duration: Approx 7 days Possible Dates: 31 May to 6 June Activities: Travel to Svalbard Underway continuous water supply sampling Occasional shallow CTD/Niskin deployments Deep water benthic lander test Personnel exchange at Longyearbyen

  7. Leg 2: Longyearbyen to North Svalbard Sea-Ice (Return) Duration: Approx 14 days Possible Dates: 7 June to 20 June Location: 80.00 to 80.30 N and 10.00 to 16.00 E Activities: Take JCR as far into sea-ice north of Svalbard as possible Surface sea-ice sampling and equipment deployment Under-ice sampling and equipment deployment using divers CTD/Niskins, nets, benthic sampling from ship Return to Ny Alesund and/or Longyearbyen to exchange personnel

  8. Leg 3: Longyearbyen to North and North-West Svalbard Shelf Duration: Approx 10 days Possible Dates: 21 June to 30 June Location: 80.00 to 80.30 N and 10.00 to 16.00 E (perhaps as far as 22.00 E if ice free) Activities: Take JCR to sea-ice edge and open water N & NW of Svalbard CTD/Niskins, nets, benthic sampling from ship Benthic lander deployments AUV & physics instrument deployments Return to Ny Alesund and/or Longyearbyen to collect UCORS Staff

  9. Leg 4: Longyearbyen to NW Shelf/Molloy Deep/NE Greenland Shelf Duration: Approx 11 days Possible Dates: 1 July to 11 July Location: 71.00 to 82.30 N and 10.00 E to 10.00 W (i.e. onto Greenland shelf if ice allows) Activities: Take JCR to NW Svalbard shelf and Molloy Deep AUV & physics mooring instrument deployments on NW Shelf Piston Coring on NW Shelf and Molloy Deep (4 days) Possible CTD/Niskins, nets, benthic sampling in cold water off Greenland Return to Longyearbyen – Demobilisation ? UKCORS staff and others depart ship

  10. Leg 5: Longyearbyen to UK Duration: Approx 7 days Possible Dates: 12 July to 18 July Activities: Travel to UK Demobilisation in UK?

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