Outer Hebrides Process Cruise Oct 2014

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Adelia Ramsey
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1 Outer Hebrides Process Cruise Oct 2014 Stuart Painter National Oceanography Centre 15 th Jan 2014 Liverpool

1960-2004 1989-2004 Blue <150m depth surface flux Red >150 m depth subsurface

2 Background Modelled estimates of mean volume fluxes (Sv) at the shelf edge show a large influx/outflux across the Malin and Hebridean shelf regions Blue <150m depth surface flux Red >150 m depth subsurface flux (Huthnance et al 2009) Red <180m depth Blue >180 m depth (Wakelin et al 2012)

3 Study site The region has previously seen two major field studies 1995 Shelf Edge Study 2013 Fastnet 1975-present - Regular sampling from the Ellett Line. But, for whole shelf CO 2 flux assessment within SSB there is insufficient information on DIC concentrations & gradients in this region

4 Cruise overview Developing plan based around ~10 CTD transects across shelf ~15-20 nm along track spacing ~30 nm between leg spacing Depths of between m Depth (m) Depth range (m) No. Stations <100 depth > TOTAL 66

5 Relevance to SSB Provisional sampling density for whole shelf CO 2 flux estimates (No. samples per 1 o x1 o box) (Courtesy Jamie Shutler and Peter Land, PML)

Summary Cruise dates: 14 th Oct (Port TBA) to 1 st Nov (Southampton) There are opportunities for SSB to obtain data from the Outer Hebrides region on Inorganic/organic nutrients Dissolved oxygen

6 Summary Cruise dates: 14 th Oct (Port TBA) to 1 st Nov (Southampton) There are opportunities for SSB to obtain data from the Outer Hebrides region on Inorganic/organic nutrients Dissolved oxygen Hydrography Shelf edge transports Dissolved inorganic carbon This needs to be discussed this week May 2013 Ellett Line DIC section across Rockall Trough (Courtesy Jan-Lukas Barraqueta, Masters project)

7 Overview of Sensors on Gliders programme 15 th Jan 2014 Liverpool Stuart Painter (NOC) Claire Mahaffey (U Liverpool) Maeve Lohan (U Plymouth) Peter Tyack (U St. Andrews)

8 Background and projects Autonomous underwater vehicle technology programme: Sensors on autonomous underwater gliders (Aug 2011) Main Objective: This call for proposals provides for experimental opportunities to trial the AUV technology programme s two dedicated gliders along with the biochemical sensors developed under the OCEANS-2025 programme, and test new operational paradigms using the gliders from shore bases for open-ocean research. Outcome: 4 PhD projects NOC Using glider based observations of fluorescence and PAR to improve modelled estimates of primary production. UoL Transport and distribution of DOM UoP Physical process underlying cross shelf fluxes of NO 3 - and PO 4 3- UoSt.A Passive acoustic monitoring of marine mammals

9 Technology

10 SoG Fieldwork First deployment on Malin Shelf (July 2013) Both deployments < 2weeks Neither glider contained a nutrient sensor

during SSB cruise 3 (Fones) in May 2014.

11 Sampling strategy Deployment 1: (~2.5 months) 2 Seagliders to be deployed during SSB cruise 1 (Ruhl) in March 2014 and recovered during SSB cruise 3 (Fones) in May Deployment 2: (~3 months) 2 Seagliders to be deployed during SSB cruise 5 (Solan) in August 2014 and recovered during SSB cruise 6 (Sharples) in Dec Possible inclusion of nutrient sensors on deployment 2

12 SSB sampling area 3 CTD transects planned at shelf break for WP3 (iron) Each transect ~75 km 5 CTD stations on each transect Plan is to sample along transect 1 and 2 for ~3 months at 2 different times

13 Requirements Access to SSB data (CTD profile and bottle data: dissolved oxygen, chl-a, salinity, organic/inorganic nutrients, primary production, PAR, etc) Coincident CTD cast during deployment/recovery for calibration - PSO s please take note Access to WP3 glider data requested by Mahaffey and Lohan (separate gliders to SoG deployments). A plea for people to sample shelf edge CTD stations

Pioneer Array Micro-siting Meeting

Ocean Observatories Initiative Pioneer Array Micro-siting Meeting June 7, 2011 Coastal Institute University of Rhode Island June 7, 2011 PIONEER ARRAY MICRO-SITING MEETING AGENDA Welcome, Introduction