Cruise inventory

FRV Alba Na Mara 1008A

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Alba Na Mara (74NM)
Cruise identifier1008A
Cruise period2008-09-24 — 2008-10-02
StatusCompleted
Port of departureFraserburgh, United Kingdom
Port of returnFraserburgh, United Kingdom
PurposeFisheries
ObjectivesObjectives

1. To collect seabed sediment cores and grab samples from a range of sediment types in an area up to 10km offshore between Catterline and Porthlethen off the east coast of Scotland.

2. Conduct experiments on the collected cores aboard the ship, involving incubating cores in a tank on deck, and measurements in the laboratory.

3. Collect hydrographic, water and plankton data and samples at each core collection site, and at the routine Stonehaven monitoring site.

4. Deploy a vertical dip camera frame at core and grab collection sites to obtain images of the seabed.

5. Carry out Roxann and thermosalinograph surveying within the study area

6. To re-lay a Datawell wave rider buoy off Aberdeen beach.

Narrative

The vessel sailed from Fraserburgh shortly before midday on 24 September and made a passage to Aberdeen Bay where the Datawell waverider buoy was deployed without difficulty. The vessel then anchored for the night and various of the coring and hydrographic equipment were tested.

The following day (25 September) Alba na Mara headed south into the study area, anchoring each night in Stonehaven Bay. On each of 6 days in the area, the vessel completed a full 12h programme of work with no loss of time due to weather, or equipment failures. Due to imminent bad weather, the vessel headed north to Fraserburgh on the evening of 30 September rather than remaining at Stonehaven and making the passage on 1 October, arriving at 0100. However, this did not interfere with scientific work on samples, which continued aboard the ship during 1 October in Fraserburgh harbour.

The scientific programme was divided between 4 tasks: 1) collection of sediment cores with associated CTD data, and measurements on the cores aboard the ship, 2) collection of seabed video footage and grab samples, sieving of the grab samples through various sieves and analysis of the fauna collected, 3) daily completion of standard hydroplankton sampling (CTD, water sampling, zooplankton sampling) at the Stonehaven monitoring site (5km offshore from Stonehaven), 4) Roxann and thermosalinograph surveying.

The experimental measurements on each sediment core (permeability, oxygen uptake, nutrient fluxes and vertical profiles) took 2 days to complete. The collection of cores was therefore staged through the survey since space, personnel and equipment limited the conduct of the experiments to approximately 9 cores at any one time, with a minimum of 3 replicates being required for each site. During the course of the survey, measurements were completed on cores from 7 sites ranging from mud to mixed sand/gravel. An additional constraint was that the operation of the corer required as close as possible to slack tide conditions.

Video and grab sampling was carried out at 48 sites selected according to a stratified sampling scheme based on sediment classes defined from a previously conducted Roxann and QTC/Swathe bathymetry survey. 3 grab samples were sieved through a 5mm mesh sieve and the fauna sorted and identified at sea. A further grab sample was sieved through 1mm and 0.5mm sieves and preserved for later analysis, and a subsample saved for grain size and elemental analysis.

Thermosalinograph and Roxann data were collected continuously throughout the cruise. In addition, detailed Roxann surveying was carried out on 30th September within 1nm x 1nm areas centred on two of the coring sites, with survey tracks at 100m spacing. The core sites selected were in areas of extremely diverse sediment and the data were collected to aid return to the site and reliable future sample collections.
Chief scientistMike R Heath (Fisheries Research Services Aberdeen Marine Laboratory)
ProjectMF0758, AE11q
Cruise reportFRV Alba Na Mara 1008A cruise report 1008a.pdf — access key 'C' (0.91 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificNorth Sea, off Aberdeen
Track chartsFRV Alba Na Mara 1008A cruise track — 1008atrk.pdf (00 MB) 
Data held at BODC 
Series/Profiles 
12  CTD/STD cast
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column
Reference numbers
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Vertical spatial coordinates
Salinity of the water column
Temperature of the water column
Reference numbers

BODC idDate/TimeLocationDoc.
9252972008-09-25 13:37 56° 58' 50" N  2° 7' 18" W  View metadata report for BODC series reference number 925297
9253042008-09-26 09:03 56° 57' 46" N  2° 6' 38" W  View metadata report for BODC series reference number 925304
9253162008-09-27 12:54 57° 0' 13" N  2° 7' 18" W  View metadata report for BODC series reference number 925316
9253282008-09-27 14:12 56° 57' 40" N  2° 10' 6" W  View metadata report for BODC series reference number 925328
9253412008-09-27 14:39 56° 57' 44" N  2° 6' 37" W  View metadata report for BODC series reference number 925341
9253532008-09-29 11:39 56° 56' 43" N  2° 4' 39" W  View metadata report for BODC series reference number 925353
9253652008-09-29 12:11 56° 55' 17" N  2° 9' 37" W  View metadata report for BODC series reference number 925365
9253772008-09-29 16:15 56° 57' 39" N  2° 6' 45" W  View metadata report for BODC series reference number 925377
9253892008-09-30 08:21 56° 57' 40" N  2° 6' 47" W  View metadata report for BODC series reference number 925389
9252612008-09-25 08:41 57° 0' 42" N  2° 5' 25" W  View metadata report for BODC series reference number 925261
9252732008-09-25 09:40 56° 57' 47" N  2° 6' 47" W  View metadata report for BODC series reference number 925273
9252852008-09-25 12:28 56° 57' 29" N  2° 7' 19" W  View metadata report for BODC series reference number 925285