Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM10/78 (C/6/78) |
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Cruise period | 1978-09-26 — 1978-10-10 |
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Status | Completed |
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Port of departure | Barry, United Kingdom |
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Port of return | Barry, United Kingdom |
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Purpose | Research |
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Objectives | 1) To measure the nutreints, chlorophyll, microseston, particle concentration and siz distribution, POC, PON, temperature, salinity, and the phytoplankton and zooplankton populations
2) To measure the feeding rates and development times of Calanus Helgolandicus and Acartia clausi
3) To measure the rate of primary production and nitrate uptake by phytoplankton
4) To measure the uptake and release of nutrients by micro organisms
5) To measure the release of ammonia by zooplankton
6) To measure the nutrient concentrations and oxygen consumption of pore water, and the rate of exchange of nutrients between the sediment and water column |
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Chief scientist | Howard H Bottrell (Institute of Marine Environmental Research, Plymouth) |
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Cruise report | (0.28 MB) |
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Ocean/sea areas | |
General | Irish Sea and St. George's Channel Bristol Channel |
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Track charts | |
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Measurements | |
Physical oceanography | |
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Surface measurements underway (T,S) | |
Subsurface temperature and salinity measurements | |
Chemical oceanography | |
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Phosphate | Description: continuous |
Nitrate | Description: continuous |
Nitrite | Description: continuous |
Silicate | Description: continuous |
Biology and fisheries | |
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Primary productivity | |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 144 |
Particulate organic matter (inc POC, PON) | Quantity: number of stations = 100 |
Phytoplankton | Quantity: number of stations = 100 |
Zooplankton | Quantity: number of stations = 127 Description: survey:distribution,biomass,energy transfers,population studies |
Seston | Quantity: number of stations = 144 |
Pelagic bacteria/micro-organisms | Quantity: number of stations = 2 |
Benthic bacteria/micro-organisms | Quantity: number of stations = 22 |
Data held at BODC | |
Discrete samples | |
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162 General station with STD/bottles/additional instruments | Nitrite concentration parameters in the water column Temperature of the water column Phosphate concentration parameters in the water column Salinity of the water column Silicate concentration parameters in the water column Nitrate concentration parameters in the water column Phaeopigment concentrations in the water column Chlorophyll pigment concentrations in water bodies
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