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RV Prince Madog PD04/04
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RV Prince Madog (74P2) |
Cruise identifier | PD04/04 |
Cruise period | 2004-02-06 — 2004-02-19 |
Status | Completed |
Port of departure | Menai Bridge, United Kingdom |
Port of return | Menai Bridge, United Kingdom |
Purpose | Research |
Objectives | BACKGROUND:
It is suspected that turbulence controls the properties of suspended particulate matter (SPM) in tide-stirred shelf seas and so controls the vertical flux of SPM and organic carbon to the seabed, but there are very few observational data to support theoretical and laboratory evidence. These uncertainties constitute major prediction-limiting factors in water quality and ecosystem models. We have preliminary data which support turbulence control of particle disaggregation in the boundary layer and provide evidence for aggregation at the base of the thermocline. The aim of the project is to make in situ observations of turbulence and SPM under a range of dynamic conditions to develop functional relationships between turbulence and SPM, and to explore temporal/spatial evolution of SPM properties, particularly with respect to aggregation, resuspension, and advection of lateral differential size and concentration gradients. PROJECT OBJECTIVES: To obtain high quality observational data sets of tidal flow, in situ SPM and turbulence properties in contrasting energy regimes. To investigate generic relationships between SPM and turbulence properties. To investigate and model the time history of aggregate development and vertical/lateral exchanges. Specific Cruise Objectives: Deploy an ADCP mooring to determine tidal flow, stress, and TKE production estimates. Obtain full CTD profiles to determine water column structure. Obtain surface and deep-water samples & filter for suspended sediments. Carry out hourly series of FLY measurements to determine profiles of TKE dissipation. Carry out LISST 100B & C profiles, for data inter-comparison. Deploy settling velocity tubes in bottom, surface and thermocline regions. |
Chief scientist | Neil Fisher (University of Wales, Bangor School of Ocean Sciences) |
Cruise report | (4.96 MB) |
Ocean/sea areas | |
General | Inner Seas off the West Coast of Scotland Irish Sea and St. George's Channel |
Specific | Clyde Sea; Irish Sea |
Track charts | (0.11 MB) |
Measurements | |
Physical oceanography | |
CTD stations | Quantity: number of stations = 3 Description: At mooring stations identified in section above, 25-50 hr timeseries of CTD, FLY, LISST and settling velocity measurements made |
CTD stations | Quantity: number of stations = 17 Description: 2 transects of 9 stations (HH1-HH9) and 8 stations (T3-T10 where T5 also moored ADCP station, see above). At each station, CTD and LISST (combination of LISST 25, LISST 100c and LISST 100b) profiles carried out. |
Transparency (eg transmissometer) | Quantity: number of stations = 17 Description: 2 transects of 9 stations (HH1-HH9) and 8 stations (T3-T10 where T5 also moored ADCP station, see above). At each station, CTD and LISST (combination of LISST 25, LISST 100c and LISST 100b) profiles carried out. |
Transparency (eg transmissometer) | Quantity: number of stations = 3 Description: At mooring stations identified in section above, 25-50 hr timeseries of CTD, FLY, LISST and settling velocity measurements made |
Other physical oceanographic measurements | Quantity: number of stations = 3 Description: At mooring stations identified in section above, 25-50 hr timeseries of CTD, FLY, LISST and settling velocity measurements made |
Moorings, landers, buoys | |
Physical oceanography | |
Current profiler (eg ADCP) | 55° 21' 1" N 5° 4' 41" W — Station name: Clyde Sea, C2, deployment of ADCP |
Current profiler (eg ADCP) | 53° 28' 39" N 3° 37' 53" W — Station name: Liverpool Bay, Station T5, deployment of ADCP |
Current profiler (eg ADCP) | 53° 27' 38" N 4° 32' 54" W — Station name: Irish Sea, Station Ethel, deployment of ADCP |