Overturning in the Subpolar North Atlantic Programme (OSNAP)

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Presentation transcript:

Overturning in the Subpolar North Atlantic Programme (OSNAP) Presented by Penny Holliday, NOC, Southampton, UK USA, UK, Canada, France, Germany, Netherlands & China Four years (2014-18) “Pilot project”; aim is to design optimally efficient long-term measuring system OSNAP: quantify large-scale, low-frequency, full water-column net fluxes of mass, heat and fresh water associated with the meridional overturning circulation Meridional transport of heat & freshwater has a local, regional and global impact Most of our knowledge derived from (imperfect) models; need direct measurements Part of Atlantic Ocean transport observing system www.o-snap.org

What does Atlantic Ocean Transport Observing Network need from seabed mapping? A. Global Ocean Circulation Models/Climate Models Pathways of currents: depth and gradients (including within a grid cell) are key. (i) GOCMs need maps at resolution > 1 km model gridscale => 100s m scale over large areas, eg Greenland shelf (climate models lower resolution at the moment…) Changing the bottom drag coefficent can improve representation of key circulation features in specific locations eg Gulf Stream NW corner, Mediterranean outflow (ii) Friction and instability: accurate seafloor roughness maps for ocean circulation models B. Practical information for planning observations Siting of moorings (10s m scale over specific and small regions) Now: - approx location determined - Mooring built for specific depth - 24 hour swath survey Better: maps allow precise planning

Implementation Measures Need more data? Use oceanography cruises as ships of opportunity for multi-beam data eg OSNAP summer 2014, 6 cruises, 4 ships, more cruises in 2015,16,18 Many other suitable cruises planned Need agreed protocols for research ships (with non-specialist staff) collecting opportunistic multi-beam data. Plus: centre(s) with resources to process and distribute these data Work with modellers to identify key locations and to improve parameterisation of boundary layer mixing Need to know what products modellers want – and they need to know how to apply the data in the models (avoid unintended consequences).