Cruise inventory

RRS Discovery D381A

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD381A
Cruise period2012-08-28 — 2012-09-13
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnFalmouth, United Kingdom
PurposeResearch
ObjectivesThe first leg (A) of the D381 sought to deploy a cluster of 9 moorings, 4 guard buoys and 2 gliders at a site in the close vicinity of the Porcupine Abyssal Plain Observatory, with the ultimate goal of measuring a full annual cycle of changes in upper-ocean properties and the physical processes underpinning those changes. 8 of the 9 moorings were successfully deployed during this leg (the remaining mooring was deployed shortly after, in leg B). The 4 guard buoys were also deployed, but one of these (the one containing meteorological sensors) sank shortly after deployment, the exact causes of this failure being unknown at the time of writing this report. The 2 gliders were eventually deployed with success, after some initial failed deployments. A further objective of leg A was to deploy a wave rider buoy, to provide spectral wave measurements for the process studies in leg B. This buoy was deployed successfully.

The D381A cruise also conducted the deployment of a wirewalker mooring and a bottom-mounted ADCP on the edge of the continental shelf, for the FASTNET project.
Chief scientistAlberto C Naveira Garabato (University of Southampton School of Ocean and Earth Science)
ProjectOcean Surface Mixing, Ocean Submesoscale Interaction Study (OSMOSIS), FASTNEt
Cruise reportRRS Discovery D381A cruise report d381.pdf — access key 'C' (9.63 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificPorcupine Abyssal Plain
Track chartsRRS Discovery D381A cruise track — d381atrk.pdf (00 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 9
Description: RRS Discovery thermosalinograph data: Conductivity, Temperature, Fluorescence, Optical Transmittance, Wind Velocity, Photosynthetic Available Radiation (PAR), Total Incident Radiation, Air Temperature and Atmospheric Pressure. Underway sampling hourly for Chlorophyll(a), Nutrients and Salinity, 4 hourly for POC, HPLC, BSi, PIC and SEM counts.
CTD stationsQuantity: number of stations = 4
Description: CTD station numbers 381001 - 381004; Conductivity, Temperature, Fluorescence, Optical Transmittance, Oxygen, PAR, Lowered ADCP (LADCP), Optical backscatter. Samples taken at 11 or 12 depths for Salinity, Oxygen, Nutrients, Chlorophyll(a), POC, HPLC, BSi, PIC, SEM counts.
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature and salinity measurements48° 45' 41" N  16° 6' 18" W — UEA glider 510 deployed
Subsurface temperature and salinity measurements48° 45' 41" N  16° 6' 18" W — UEA glider 566 deployed
Subsurface temperature and salinity measurements48° 42' 0" N  16° 20' 29" W — UEA glider 533 deployed
Subsurface temperature and salinity measurements48° 42' 0" N  16° 8' 53" W — UEA glider 510 recovered
Subsurface temperature measurements48° 44' 53" N  16° 16' 35" W — OSMOSIS north west outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Subsurface temperature measurements48° 41' 11" N  16° 11' 11" W — OSMOSIS central mooring deployed, 13 current meters and 13 CTs; one each at approximately 50 m, 75 m, 110 m, 145 m,160 m, 195 m, 230 m, 260 m, 300 m, 350 m, 400 m, 460 m, 512 m; 4 600kHz ADCP at approximately 50 m 75 m 160 m 290 m; 1 75 kHz ADCP at 450 m.
Subsurface temperature measurements48° 40' 41" N  16° 12' 17" W — OSMOSIS north west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Subsurface temperature measurements48° 41' 35" N  16° 10' 23" W — OSMOSIS north east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m. 3 600kHz ADCP at approximately 50 m, 110 m, 230 m.
Subsurface temperature measurements48° 40' 41" N  16° 12' 17" W — OSMOSIS south west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510m. One 75kHz ADCP at 450 m.
Subsurface temperature measurements48° 44' 53" N  16° 5' 41" W — OSMOSIS north east outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Subsurface temperature measurements48° 40' 47" N  16° 10' 23" W — OSMOSIS south east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Subsurface temperature measurements48° 37' 35" N  16° 16' 35" W — OSMOSIS south west outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Current meters48° 44' 53" N  16° 5' 41" W — OSMOSIS north east outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Current meters48° 37' 35" N  16° 16' 35" W — OSMOSIS south west outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Current meters48° 38' 59" N  9° 6' 18" W — FASTNET wirewalker mooring deployed. Wirewalker unit records temperature, conductivity, pressure, oxygen concentration, Chlorophyll-a, CDOM and Phycoerthrin fluorescence. One 150Khz ADCP and CT in a bedframe.
Current meters48° 40' 47" N  16° 10' 23" W — OSMOSIS south east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Current meters48° 41' 11" N  16° 11' 11" W — OSMOSIS central mooring deployed, 13 current meters and 13 CTs; one each at approximately 50 m, 75 m, 110 m, 145 m,160 m, 195 m, 230 m, 260 m, 300 m, 350 m, 400 m, 460 m, 512 m; 4 600kHz ADCP at approximately 50 m 75 m 160 m 290 m; 1 75 kHz ADCP at 450 m.
Current meters48° 40' 41" N  16° 12' 17" W — OSMOSIS north west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Current meters48° 41' 35" N  16° 10' 23" W — OSMOSIS north east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m. 3 600kHz ADCP at approximately 50 m, 110 m, 230 m.
Current meters48° 40' 41" N  16° 12' 17" W — OSMOSIS south west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510m. One 75kHz ADCP at 450 m.
Current meters48° 44' 53" N  16° 16' 35" W — OSMOSIS north west outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Current profiler (eg ADCP)48° 41' 35" N  16° 10' 23" W — OSMOSIS north east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m. 3 600kHz ADCP at approximately 50 m, 110 m, 230 m.
Current profiler (eg ADCP)48° 40' 41" N  16° 12' 17" W — OSMOSIS south west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510m. One 75kHz ADCP at 450 m.
Current profiler (eg ADCP)48° 41' 11" N  16° 11' 11" W — OSMOSIS central mooring deployed, 13 current meters and 13 CTs; one each at approximately 50 m, 75 m, 110 m, 145 m,160 m, 195 m, 230 m, 260 m, 300 m, 350 m, 400 m, 460 m, 512 m; 4 600kHz ADCP at approximately 50 m 75 m 160 m 290 m; 1 75 kHz ADCP at 450 m.
Current profiler (eg ADCP)48° 40' 41" N  16° 12' 17" W — OSMOSIS north west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Current profiler (eg ADCP)48° 40' 47" N  16° 10' 23" W — OSMOSIS south east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Current profiler (eg ADCP)48° 38' 59" N  9° 6' 18" W — FASTNET wirewalker mooring deployed. Wirewalker unit records temperature, conductivity, pressure, oxygen concentration, Chlorophyll-a, CDOM and Phycoerthrin fluorescence. One 150Khz ADCP and CT in a bedframe.
Other physical oceanographic measurements48° 44' 53" N  16° 16' 35" W — OSMOSIS north west outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Other physical oceanographic measurements48° 40' 41" N  16° 12' 17" W — OSMOSIS north west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Other physical oceanographic measurements48° 44' 53" N  16° 5' 41" W — OSMOSIS north east outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Other physical oceanographic measurements48° 38' 59" N  9° 6' 23" W — FASTNET wirewalker mooring recovered.
Other physical oceanographic measurements48° 38' 59" N  9° 6' 18" W — FASTNET wirewalker mooring deployed. Wirewalker unit records temperature, conductivity, pressure, oxygen concentration, Chlorophyll-a, CDOM and Phycoerthrin fluorescence. One 150Khz ADCP and CT in a bedframe.
Other physical oceanographic measurements48° 37' 35" N  16° 16' 35" W — OSMOSIS south west outer mooring deployed, 5 current meters, and 5 CTs; one each at approximately 50 m, 110 m, 225 m, 350 m and 510m.
Other physical oceanographic measurements48° 41' 35" N  16° 10' 23" W — OSMOSIS north east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m. 3 600kHz ADCP at approximately 50 m, 110 m, 230 m.
Other physical oceanographic measurements48° 40' 47" N  16° 10' 23" W — OSMOSIS south east inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510 m. One 75kHz ADCP at 450 m.
Other physical oceanographic measurements48° 46' 29" N  16° 11' 11" W — OSMOSIS TRIAXYS waverider buoy measures wave height, period and direction.
Other physical oceanographic measurements48° 40' 41" N  16° 12' 17" W — OSMOSIS south west inner mooring deployed, 7 current meters, and 7 CTs; one each at approximately 50 m, 110 m, 160 m 225 m, 300 m, 350 m and 510m. One 75kHz ADCP at 450 m.
Other physical oceanographic measurements48° 41' 11" N  16° 11' 11" W — OSMOSIS central mooring deployed, 13 current meters and 13 CTs; one each at approximately 50 m, 75 m, 110 m, 145 m,160 m, 195 m, 230 m, 260 m, 300 m, 350 m, 400 m, 460 m, 512 m; 4 600kHz ADCP at approximately 50 m 75 m 160 m 290 m; 1 75 kHz ADCP at 450 m.
Data held at BODC 
Series/Profiles 
4  CTD/STD cast
Density of the water column
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
Optical backscatter
Temperature of the water column
Reference numbers
Dissolved oxygen parameters in the water column
Density of the water column
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
Optical backscatter
Temperature of the water column
Reference numbers
Dissolved oxygen parameters in the water column

BODC idDate/TimeLocationDoc.
17237592012-09-02 18:42 48° 45' 42" N  16° 6' 15" W  View metadata report for BODC series reference number 1723759
17237602012-09-04 11:42 48° 42' 1" N  16° 8' 55" W  View metadata report for BODC series reference number 1723760
17237722012-09-06 12:37 48° 42' 1" N  16° 20' 37" W  View metadata report for BODC series reference number 1723772
17237472012-08-31 15:13 48° 37' 53" N  16° 16' 55" W  View metadata report for BODC series reference number 1723747
Discrete samples 
4  CTD frame plus rosette samplerChlorophyll pigment concentrations in water bodies
Salinity of the water column
Dissolved oxygen parameters in the water column
53  Sample taken from ship's non-toxic supplyChlorophyll pigment concentrations in water bodies