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RV Prince Madog PD17/04
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RV Prince Madog (74P2) |
Cruise identifier | PD17/04 |
Cruise period | 2004-05-02 — 2004-05-08 |
Status | Completed |
Port of departure | Menai Bridge, United Kingdom |
Port of return | Menai Bridge, United Kingdom |
Purpose | Research |
Objectives | Outline of science objectives:
1) Derivation of suspended particulate matter concentrations in shelf seas from remotely sensed imagery and assessment of the effect high chlorophyll concentrations have on this derivation. 2) Use of variable fluorescence to derive photosynthetic parameters in-situ and to develop algorithms enabling primary production to be obtained from satellite imagery. 3) Estimation of variability in horizontal water structure over a 50 hour tidal cycle in a mixed and a stratified region and possible effects this may have on remote sensing of shelf seas. 4) Estimation of turbulence and variability in horizontal water structure over a 50 hour tidal cycle in a mixed and a stratified region with the aim of using this data to improve shelf sea models. 5) Analysis of trawl tracks. Main cruise objectives: 1) Measurement of suspended particulate material, chlorophyll (including samples for HPLC analysis) and yellow substance in-situ, with the aim of sampling during the spring chlorophyll bloom. 2) Measurement of RSR (remote sensing reflectance) and diffuse attenuation at SeaWiFS & MERIS wavelengths to assess effect of spring bloom on water leaving radiance. 3) Sampling for phytoplankton. 4) Sampling for nutrients including ammonia. 5) Measurement of conductivity, temperature, salinity, beam attenuation, fluorescence. 6) Deployment of a Fast Repetition Rate Fluorometer. 7) Deployment of two ADCP's; one at a tidally mixed station near Holyhead and one at a tidally stratified station in the Western Irish Sea gyre. 8) Hourly sampling at anchor over a 50 tidal cycle to assess changes in horizontal water column structure due to the tides and resultant effects on remote sensing and shelf sea modelling. This sampling is to occur at the tidally mixed station and the tidally stratified station. 9) Deployment of settling tubes at tidal cycle stations in mixed and stratified waters. 10) Side scan sonar studies of trawl tracks in Colwyn Bay and off Wh |
Chief scientist | E Gay Mitchelson-Jacob (University of Wales, Bangor School of Ocean Sciences) |
Project | Centre for Air/Sea Interactions and Fluxes |
Coordinating body | UK Natural Environment Research Council |
Ocean/sea areas | |
General | Irish Sea and St. George's Channel |
Specific | Irish Sea |
Track charts | (0.19 MB) |
Measurements | |
Physical oceanography | |
Water bottle stations | Quantity: number of profiles = 82 Description: Sampling of water at depth using water bottles on CTD rosette |
CTD stations | Quantity: number of profiles = 82 Description: Measurement of salinity profiles by CTD |
CTD stations | Quantity: number of profiles = 82 Description: Measurement of temperature profiles by CTD |
CTD stations | Quantity: number of profiles = 82 Description: Measurement of transmittance profiles by CTD |
CTD stations | Quantity: number of profiles = 82 Description: Measurement of fluorescence profiles by CTD |
Transparency (eg transmissometer) | Quantity: number of measurements = 31 Description: Secchi Depth |
Transparency (eg transmissometer) | Quantity: number of profiles = 34 Description: Measurement of diffuse attenuation coefficients at SeaWiFS wavelengths |
Optics (eg underwater light levels) | Quantity: number of profiles = 34 Description: Measure in-situ profiles of spectral remote sensing reflectance at SeaWiFS wavelengths with PRR-600 radiometer |
Other physical oceanographic measurements | Quantity: number of samples = 92 Description: Sample particulate absorption by filter pad technique at surface |
Other physical oceanographic measurements | Quantity: number of profiles = 88 Description: Measure SPM volume-specific particle size classes with LISST-100 |
Other physical oceanographic measurements | Quantity: number of samples = 264 Description: Measurements of particle settling velocity using timed filtration of samples from settling tubes |
Other physical oceanographic measurements | Quantity: number of samples = 55 Description: Sample particulate absorption by filter pad technique at depth |
Chemical oceanography | |
Phosphate | Quantity: number of samples = 260 Description: Sampling for phosphate at depth |
Phosphate | Quantity: number of samples = 204 Description: Sampling for phosphate at surface |
Nitrate | Quantity: number of samples = 204 Description: Sampling for nitrate at surface |
Nitrate | Quantity: number of samples = 260 Description: Sampling for nitrate at depth |
Nitrite | Quantity: number of samples = 260 Description: Sampling for nitrite at depth |
Nitrite | Quantity: number of samples = 204 Description: Sampling for nitrite at surface |
Ammonia | Quantity: number of samples = 204 Description: Sampling for ammonia at surface |
Ammonia | Quantity: number of samples = 260 Description: Sampling for ammonia at depth |
Silicate | Quantity: number of samples = 260 Description: Sampling for silicate at depth |
Silicate | Quantity: number of samples = 204 Description: Sampling for silicate at surface |
Biology and fisheries | |
Primary productivity | Quantity: number of profiles = 88 Description: Measurement of photosynthetic response with FRRF variable fluorescence fluorometer |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 12 Description: Sampling for chlorophyll at depth, analysis by HPLC |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 264 Description: Sampling for chlorophyll at surface, analysis by fluorometry |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 393 Description: Sampling for chlorophyll at depth, analysis by fluorometry |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 16 Description: Sampling for chlorophyll at surface, analysis by HPLC |
Dissolved organic matter (inc DOC) | Quantity: number of samples = 20 Description: Sampling for CDOM at depth, analysis by spectrophotometry |
Dissolved organic matter (inc DOC) | Quantity: number of samples = 31 Description: Sampling for CDOM at surface, analysis by spectrophotometry |
Seston | Quantity: number of samples = 203 Description: Sampling for SPM at depth, analysis by weight and by ignition |
Seston | Quantity: number of samples = 131 Description: Sampling for SPM at surface, analysis by weight and by ignition |
Geology and geophysics | |
Long/short range side scan sonar | Quantity: number of track lines = 24 Description: Side-scan sonar analysis of trawl tracks |
Moorings, landers, buoys | |
Physical oceanography | |
Current profiler (eg ADCP) | 53° 23' 2" N 4° 41' 57" W — Sea-bed deployed ADCP mooring, deployed 02/05/04. Station identifier: Station H. |
Current profiler (eg ADCP) | 53° 34' 57" N 5° 46' 56" W — Seabed-deployed ADCP mooring, deployed 02/05/04, recovered on 04/05/04. Station identifier: Station G. |