RV Prince Madog PD11/04A

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Prince Madog (74P2)
Cruise identifierPD11/04A
Cruise period2004-03-29 — 2004-03-31
Port of departureMenai Bridge, United Kingdom
Port of returnBirkenhead, United Kingdom
ObjectivesThe objectives are to recover moored instrumentation, i.e. STABLE, PMP, Wave Buoy and ADCP frame previously deployed at the mouth of the River Dee. Also to carry out at least a CTD tidal cycle in the Welsh Channel and the Hilbre Swash, to study turbulence and SPM processes.
In the following narrative all times are UMT The Prince Madog was loaded on the 28/03/2004, mainly light boxes and tools, as it is a recovery cruise. We sailed from Menai Bridge at 08:30 on the 29/03/2004, arriving to the Welsh Channel by 12:30. A 13 hour CTD yoyo was carried out sampling every 1/2 hour. The CTD station was finished at 01:00 30/03/2004 to allow the crew to rest for the recovery later in the morning. At 05:20 the anchor was lifted and we proceeded to retrieve the Toroid Marker buoy. Then we tried to retrieve the ADCP frame but it failed to surface so we had to drag for it. It came on board at 06:20. At 06:50 we left for the Hilbre Swash and retrieved the Wave Buoy at 08:20. We anchored to start a 25 hour CTD yoyo at 09:00. 10;00 finished CTD yoyo, recovered PMP, recovered STABLE.
Chief scientistAlejandro J Souza (Proudman Oceanographic Laboratory)
ProjectDee experiment
Coordinating bodyPOL
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
SpecificIrish Sea; Liverpool Bay; Mouth of the Dee Estuary
Physical oceanography 
Surface measurements underway (T,S)Description: Underway temp, sal., chlorophyll, transmittance
CTD stationsQuantity: number of profiles = 76
Description: CTD profiles, supplementary chlorophyll, transmissometer and LISST data
Current profiler (eg ADCP)Description: On board ADCP
Moorings, landers, buoys 
Physical oceanography 
Transparency (eg transmissometer)53° 22' 7" N  3° 19' 25" W — LISST-100 C recording at 20 min burst every hour at 1.0 m from the bed
Current meters53° 22' 46" N  3° 14' 17" W — S4 current meter
Current meters53° 22' 7" N  3° 19' 25" W — ADV at 60 and 90 cm from the bottom, recording at 12 Hz in 20 minute bursts every hour
Current profiler (eg ADCP)53° 27' 0" N  3° 30' 19" W — Bottom mounted 600 kHz, mode 12, every second and 1 m bin, 20 min burst
Current profiler (eg ADCP)53° 22' 7" N  3° 19' 25" W — Bottom mounted 1.2 MHz RDI ADCP, mode 12 every second; 50 cm bin size 20 min burst
Current profiler (eg ADCP)53° 22' 46" N  3° 14' 17" W — Bottom mounted 1.2 MHz RDI ADCP, mode 12 every second; 50 cm bin size 20 min burst
Instrumented wave measurements53° 32' 9" N  3° 21' 34" W — Triaxis wave rider
Other physical oceanographic measurements53° 23' 24" N  3° 14' 13" W — STABLE
Data held at BODC 
Discrete samples 
77  CTD frame plus rosette samplerTransmittance and attenuance of the water column
Salinity of the water column
Temperature of the water column
Visible waveband radiance and irradiance measurements in the water column
Raw light meter output
Density of the water column
Raw suspended particulate material concentration sensor output
Raw fluorometer output