RRS Challenger CH99A
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Challenger (74CH) |
| Cruise identifier | CH99A |
| Cruise period | 1993-02-12 — 1993-02-21 |
| Status | Completed |
| Port of departure | Barry, United Kingdom |
| Port of return | Great Yarmouth, United Kingdom |
| Purpose | Research |
| Objectives | To measure rates of air/sea gas exchange |
| Chief scientist | Philip D Nightingale (University of East Anglia School of Environmental Sciences) |
| Project | EPOCH |
| Coordinating body | CEC |
| Ocean/sea areas | |
| General | English Channel North Sea |
| Specific | S North Sea,English Channel,Broad Fourteens |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: track kilometres = 1200.096 Description: +transmittance |
| CTD stations | Quantity: number of stations = 11 Description: CTDO + transmittance, fluorometer, irradiance |
| Transparency (eg transmissometer) | Quantity: number of stations = 11 Description: CTDO + transmittance, fluorometer, irradiance |
| Optics (eg underwater light levels) | Quantity: number of stations = 11 Description: CTDO + transmittance, fluorometer, irradiance |
| Geochemical tracers (eg freons) | Quantity: number of samples = 6 Description: surface measurements of SF6, 3He and B. Globigii spores |
| Geochemical tracers (eg freons) | Quantity: number of profiles = 9 Description: depth profiles for SF6, 3He and B. Globigii spores |
| Current profiler (eg ADCP) | Quantity: track kilometres = 1200.096 Description: shipborne ADCP |
| Instrumented wave measurements | Quantity: activity duration in days = 5 Description: wave height and wave spectra data |
| Chemical oceanography | |
| Oxygen | Quantity: number of stations = 11 Description: CTDO + transmittance, fluorometer, irradiance |
| Phosphate | Quantity: number of samples = 7 Description: surface |
| Nitrate | Quantity: number of samples = 7 Description: surface |
| Nitrite | Quantity: number of samples = 7 Description: surface |
| Total - N | Quantity: number of stations = 7 Description: nitrogen assimilation, total particulate nitrogen |
| Silicate | Quantity: number of samples = 7 Description: surface |
| Isotopes | Quantity: number of samples = 6 |
| Isotopes | Quantity: number of profiles = 9 |
| Contamination | |
| Other contaminant measurements | Quantity: number of experiments = 3 Description: measurement of surfactant biodegradation rates |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 7 Description: surface chlorophyll |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 11 Description: CTDO + transmittance, fluorometer, irradiance |
| Particulate organic matter (inc POC, PON) | Quantity: number of samples = 7 Description: Total particulate carbon, particulate organic carbon from surface water |
| Other biological/fisheries measurement | Quantity: number of profiles = 9 Description: microbial determination of methane and methane sulphonate |
| Other biological/fisheries measurement | Quantity: number of experiments = 3 Description: measurement of surfactant biodegradation rates |
| Meteorology | |
| Routine standard measurements | Quantity: track kilometres = 1111.2 Description: wind speed and direction |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Surface drifters/drifting buoys | 52° 25' 59" N 4° 0' 0" E — IDB surface drifting buoy, deployed 15 Feb, recovered 20 Feb 1993 |
| Surface drifters/drifting buoys | 52° 22' 41" N 4° 1' 0" E — IDB surface drifting buoy, deployed 15 Feb, recovered 20 Feb 1993 |
| Instrumented wave measurements | 52° 19' 0" N 4° 13' 59" E — deployment of waverider buoy, 15 Feb, recovered 20 Feb 1993 |
| Other physical oceanographic measurements | 52° 19' 0" N 4° 13' 59" E — tracer tank moored to sea floor to prevent contamination of equipment,15-20Feb |
