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BODC Cruise Metadata Report for RRS Discovery (74E3) cruise D320

Introduction

This report collates information from the BODC cruise inventory and oceanographic databases. It presents

Cruise Inventory Information

Long name RRS Discovery (74E3) cruise D320
Short name D320
Objectives and Narrative The overall aim of the UKSOLAS project DOGEE-SOLAS is the parameterization of air-sea gas exchange, which is a currently a major uncertainty in global modelling. RRS Discovery cruise D320 thus was primarily concerned with the measurement of air-sea gas transfer velocities and some of the important physical parameters that influence them through contributing to near surface turbulence, and other processes. In brief, specific cruise objectives were:

1. Determine open ocean gas transfer velocities through a number of dual-tracer releases (3He & SF6).
2. Investigate the role of surfactant in gas exchange through a targeted surfactant release in conjunction with (1).
3. Determine CO2 fluxes and transfer velocities, and make associated hydrographic and turbulence related measurements from autonomous ASIS (Air-Sea Interaction Spar) buoys.
4. Measure air-sea fluxes of CO2, sensible heat, latent heat and momentum using the AUTOFLUX automated sensor array
5. Measure underway, total gas tension, dissolved O2, and CO2 to obtain independent air-sea gas exchange estimates.
6. Make covariance and gas budgeting estimates of air-sea gas exchange using intelligent profiling Lagrangian floats.
7. Independently determine DMS fluxes and gas transfer velocities for comparison with CO2 to examine the role of gas solubility in gas transfer.
8. Deploy a spar buoy (NOC) for measurement of wave heights and bubble properties
9. Record and measure whitecap coverage and wave breaking coincident with the air-sea flux measurements using ship mounted cameras
10. Record key meteorological variables
11. Quantify flow distortion biases in the direct flux measurements via the use of established models.
12. Make biogas, surfactant and bacterial measurements in the surface microlayer and in the uppermost metres of the ocean using surface microlayer samplers, a remotely operated catamaran, and a near surface sampler.
13. Deploy an autonomous powered profiler (ASIP) for turbulence-related measurements in the mixed layer.

Objectives 1-12 were all met. Unfortunately, due to mechanical failure and loss of ASIP, objective 13 was not realised.
Ship RRS Discovery
Departure Port Falmouth, United Kingdom
Departure Date 2007-06-16
Arrival Port Govan, United Kingdom
Arrival Date 2007-07-18
Principal Scientist(s) Robert Upstill-Goddard (Newcastle University School of Marine Science and Technology)
Responsible Organisation University of Newcastle School of Biology
Associated Project(s) UK SOLAS
IHB Sea Areas Visited North East Atlantic Ocean (limit 40W)
Marsden Squares Visited 146/182
Work Area Description Atlantic west of Iberian Peninsula and Ireland
Work Area Bounding Polygon 40N,20W; 60N,20W; 60N,10W; 40N,10W; 40N,20W
Southern Limit 40N
Northern Limit 60N
Western Limit 20W
Eastern Limit 10W

Cruise Inventory Datasets

Physical oceanography  
CTD stations Quantity: number of stations = 25
Description: Vertical CTD casts (mixed layer, 150-300m): 3He tracer: collected for post-cruise analysis (on-shore mass spectrometry) due to failure of cruise objectives  
Geochemical tracers (eg freons) Quantity: number of stations = 44
Description: Vertical CTD casts (mixed layer, 150-300m): SF6 tracer by electron capture detection gas chromatography.  
Chemical oceanography  
Carbon dioxide Quantity: activity duration in days = 30
Description: Underway (5m) dissolved O2, dissolved CO2, total gas tension, temperature and salinity.  
Carbon dioxide Quantity: activity duration in days = 33
Description: Ship-mounted continuous underway surface pCO2 by gas equilibration/LICOR detection: CASIX system.  
Other chemical oceanographic measurements Quantity: activity duration in days = 30
Description: Surfactant activity: surface sampling  
Other chemical oceanographic measurements Quantity: activity duration in days = 30
Description: Continuous meteorological data and CO2 fluxes by AUTOFLUX system  
Other dissolved gases Quantity: activity duration in days = 33
Description: Underway measurements of DMS surface water concentrations  
Other dissolved gases Quantity: activity duration in days = 30
Description: Mass spectrometric measurements of DMS sea-to-air fluxes by eddy covariance  
Other dissolved gases Quantity: activity duration in days = 30
Description: Underway (5m) dissolved O2, dissolved CO2, total gas tension, temperature and salinity.  
Oxygen Quantity: activity duration in days = 30
Description: Underway (5m) dissolved O2, dissolved CO2, total gas tension, temperature and salinity.  
Total - P Quantity: activity duration in days = 22
Description: Underway continuous (every 4 min.) measurements of surface (6m) SF6 tracer by electron capture detection gas chromatography  

Cruise Inventory Mooring/Buoy Operations

Latitude Longitude Data type Description
43° 47' N 18° 16' W Carbon dioxide ASIS (I) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 22' N 17° 59' W Carbon dioxide ASIS (II) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 47' N 18° 16' W Current meters ASIS (I) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 22' N 17° 59' W Current meters ASIS (II) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 47' N 18° 16' W Instrumented wave measurements ASIS (I) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 22' N 17° 59' W Instrumented wave measurements ASIS (II) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 42' N 18° 7' W Instrumented wave measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
42° 34' N 16° 33' W Instrumented wave measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
42° 34' N 16° 6' W Instrumented wave measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
43° 13' N 17° 44' W Instrumented wave measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
43° 24' N 18° 18' W Neutrally buoyant floats Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered
43° 47' N 18° 16' W Neutrally buoyant floats Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered
42° 31' N 16° 15' W Neutrally buoyant floats Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered.
43° 47' N 18° 16' W Other dissolved gases Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered
43° 24' N 18° 18' W Other dissolved gases Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered
42° 31' N 16° 15' W Other dissolved gases Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered.
41° 42' N 18° 24' W Other dissolved gases PML Near Surface Sampler for dissolved gases. Recovered.
42° 42' N 16° 7' W Other dissolved gases PML Near Surface Sampler for dissolved gases. Recovered.
42° 27' N 16° 52' W Other dissolved gases PML Near Surface Sampler for dissolved gases. Recovered.
41° 51' N 18° 8' W Other dissolved gases PML Near Surface Sampler for dissolved gases. Recovered.
43° 47' N 18° 16' W Other physical oceanographic measurements ASIS (I) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 22' N 17° 59' W Other physical oceanographic measurements ASIS (II) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
42° 34' N 16° 33' W Other physical oceanographic measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
43° 42' N 18° 7' W Other physical oceanographic measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
43° 13' N 17° 44' W Other physical oceanographic measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
42° 34' N 16° 6' W Other physical oceanographic measurements NOC Spar buoy: wave wire and acoustic bubble data. Recovered.
43° 47' N 18° 16' W Oxygen ASIS (I) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 22' N 17° 59' W Oxygen ASIS (II) spar buoy: CO2, turbulence, hydrographic and meteorological parameters. Recovered
43° 47' N 18° 16' W Oxygen Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered
43° 24' N 18° 18' W Oxygen Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered
42° 31' N 16° 15' W Oxygen Neutrally buoyant float for oxygen, nitrogen, salinity and temperature measurements for use in air-sea flux calculations. Recovered.
43° 37' N 18° 3' W Subsurface temperature measurements Surface Argos/RF drifter with drogue/thermistor chain: position location for gaseous tracer patch. Recovered
42° 35' N 16° 10' W Subsurface temperature measurements Surface Argos/RF drifter/drogue/thermistor chain: position location for gaseous tracer patch. Recovered.
42° 42' N 17° 42' W Surface drifters/drifting buoys ASIP near surface profiler: turbulence parameters. Lost.
43° 37' N 18° 3' W Surface drifters/drifting buoys Surface Argos/RF drifter with drogue/thermistor chain: position location for gaseous tracer patch. Recovered
43° 25' N 17° 51' W Surface drifters/drifting buoys Surface Argos/RF drifter with drogue: position location for gaseous tracer patch. Recovered
42° 22' N 16° 4' W Surface drifters/drifting buoys Surface Argos/RF drifter with drogue: position location for gaseous tracer patch. Recovered.
42° 42' N 17° 42' W Surface drifters/drifting buoys Surface Argos/RF drifter with drogue: position location for gaseous tracer patch. Recovered.
42° 19' N 17° 46' W Surface drifters/drifting buoys Surface Argos/RF drifter with drogue: position location for gaseous tracer patch. Recovered.
42° 36' N 16° 7' W Surface drifters/drifting buoys Surface Argos/RF drifter with drogue: position location for gaseous tracer patch. Recovered.
43° 31' N 18° 0' W Surface drifters/drifting buoys Surface Argos/RF drifter/drogue/thermistor chain: position location for gaseous tracer patch. Recovered
42° 35' N 16° 10' W Surface drifters/drifting buoys Surface Argos/RF drifter/drogue/thermistor chain: position location for gaseous tracer patch. Recovered.

Summary of BODC Data Holdings for the Cruise

National Oceanographic Database

Summary

# Series Instrument Description Parameters
1 Pumped air sample Date and time
Horizontal spatial co-ordinates
Reference numbers
Sulphur species concentrations in the atmosphere
1 Pumped air sample Date and time
Gas fluxes between the water column and the atmosphere
Horizontal spatial co-ordinates
Reference numbers
Sampling parameters

Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)

Full List

BODC Reference Instrument Description Date/Time Location  
907291 Pumped air sample 2007-06-24 13:00:45Z to 2007-07-17 06:47:57Z From 43° 31' N, 18° 0' W to 55° 19' N, 9° 18' W Click for more
969448 Pumped air sample 2007-06-24 13:05:13Z to 2007-07-17 06:01:38Z From 43° 34' N, 18° 1' W to 55° 17' N, 9° 24' W Click for more

Project Database

# Events Gear Type Parameters Held
62 Sample taken from ship's non-toxic supply Organosulphur and organoselenium species concentration parameters in water bodies
Dissolved oxygen parameters in the water column
48 CTD frame plus rosette sampler Raw suspended particulate material concentration sensor output
Transmittance and attenuance of the water column
Visible waveband radiance and irradiance measurements in the water column
Density of the water column
Organosulphur and organoselenium species concentration parameters in water bodies
Chlorophyll pigment concentrations in water bodies
Electrical conductivity of the water column
Raw fluorometer output
Salinity of the water column
Raw light meter output
Optical backscatter
Temperature of the water column
Dissolved oxygen parameters in the water column
543 All plastic clean surface pumped supply Organosulphur and organoselenium species concentration parameters in water bodies

Note: Parameter terms are taken from the BODC Parameter Discovery Vocabulary XML (SKOS)

References

Track Charts

Track Chart

Reports

Cruise Report