CLASS and OSNAP report for JC238

The aim of this expedition was to recover and redeploy all moorings in the OSNAP array and to obtain a CTD section of hydrographic, nutrients, dissolved oxygen and dissolved organic carbon observations along the OSNAP section. The specific measurement objectives of the cruise were: 1. Recover and redeploy 4 existing mooring along the Ellett Array (EB1, WB1, WB2, RH ADCP) and 3 existing moorings in the Iceland Basin (IB5, IB4, IB3) 2. Deploy new drift-free pressure recorder (Sonardyne Fetch AZA) at EB1. 3. Conduct CTD stations and capture water samples for oxygen, total carbon, alkalinity and nutrients analysis. Data from the CTD stations was provided in near-real time (<12 hours) to the UK Met. Office to be assimilated into their short-range ocean forecast models: global 0.25 degree, North Atlantic 1/12th degree and AMM15 (European NW Shelf, ~ 1.5 km). 4. Recover and redeploy a sediment trap mooring on the Darwin Sea Mounds (DMLTM) as part of the UK Marine Protected Area habitat monitoring programme. 5. Deploy three BGC-Argo floats to maintain the UK contribution to the global ARGO network. 6. Using ship-based instrumentation to measure underway meteorology, sea-surface temperature and salinity, ocean currents from the surface to ~400m depth and waterdepth using a Kongsberg multibeam echo sounding system.