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- 3748
RRS Challenger CH88
Cruise summary report
Cruise Info. | |
Ship name (ship code) | RRS Challenger (74CH) |
Cruise identifier | CH88 |
Cruise period | 1992-02-07 — 1992-02-24 |
Status | Completed |
Port of departure | Barry, United Kingdom |
Port of return | Dundee, United Kingdom |
Purpose | Research |
Objectives | 1. To obtain field determination of the air-sea gas exchange rate over short time scales (approx 17-72 hours) and hence obtain relatively high resolution data to evaluate the dependance of the exchange rate on windspeed.
2. To measure the spatial variation in levels on the major nutrients in the North Sea, together with rates of phytoplankton production, nitrogen assimilation and bacterial production with particular regard to the major estuaries in the region. |
Chief scientist | Philip D Nightingale (University of East Anglia School of Environmental Sciences) |
Project | E.P.O.C.H. |
Coordinating body | Max Planck Institut fur Meteorologie, Hamburg |
Cruise report | (0.45 MB) |
Ocean/sea areas | |
General | North Sea |
Specific | German Bight,Schelt,Rhine,Thames,Humber,Wash,Tyne,Tees,Forth |
Track charts | (11.60 MB) |
Measurements | |
Physical oceanography | |
Surface measurements underway (T,S) | Quantity: track kilometres = 5200 Description: logged every 30 seconds |
CTD stations | Quantity: number of profiles = 13 |
Geochemical tracers (eg freons) | Quantity: number of profiles = 13 Description: Analysis of SF6 and helium-3, from surface, middle and bottom |
Chemical oceanography | |
Phosphate | Quantity: track kilometres = 5200 Description: continuous, logged every 30 seconds |
Nitrate | Quantity: track kilometres = 5200 Description: continuous, logged every 30 seconds |
Nitrite | Quantity: track kilometres = 5200 Description: continuous, logged every 30 seconds |
Ammonia | Quantity: track kilometres = 5200 Description: continuous, logged every 30 seconds |
Silicate | Quantity: track kilometres = 5200 Description: continuous, logged every 30 seconds |
Other chemical oceanographic measurements | Quantity: track kilometres = 5200 Description: continuous underway urea, logged every 30 seconds |
Contamination | |
Suspended matter | Quantity: track kilometres = 5200 Description: continuous, turbidity, logged every 30 seconds |
Biology and fisheries | |
Primary productivity | Quantity: number of measurements = 64 Description: Primary production measurements at 3-4 hour intervals |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: track kilometres = 5200 Description: continuous, fluorescence/chlorophyll, logged every 30 seconds |
Other biological/fisheries measurement | Quantity: number of measurements = 64 Description: Nitrogen assimilation and bacterial production, taken at 3-4 hour intervals |
Moorings, landers, buoys | |
Physical oceanography | |
Geochemical tracers (eg freons) | 52° 15' 0" N 3° 30' 0" E — Deployment (10Feb92) of sulphur hexafluoride and heluim-3 in seawater |
Surface drifters/drifting buoys | 52° 21' 0" N 3° 36' 0" E — ARGOS IDB 3, used to mark tracer patch |
Surface drifters/drifting buoys | 52° 22' 59" N 3° 40' 59" E — ARGOS IDB 4, used to mark tracer patch |
Surface drifters/drifting buoys | 52° 17' 59" N 3° 32' 59" E — ARGOS IDB 2, used to mark tracer patch |
Surface drifters/drifting buoys | 52° 22' 59" N 3° 40' 59" E — ARGOS IDB 5, used to mark tracer patch |
Surface drifters/drifting buoys | 52° 15' 0" N 3° 30' 0" E — ARGOS IDB 1, used to mark tracer patch |
Meteorology | |
Other meteorological measurements | 52° 27' 0" N 3° 31' 0" E — Wind vane and anemometer, tanker previously containing tracer - lost |