Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM1/78 |
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Cruise period | 1978-01-11 — 1978-01-25 |
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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 spatial variability of dissolved organic and inorganic nutrients, phytoplankton and zooplankton.
2) To measure the fluxes of organic and inorganic nutrients between phytoplankton, heterotrophic microbes and omnivorous zooplankton and to measure the rates of primary and secondary production.
3) To make current meter measurements at 2 stations as a reconnaissance for long-term deployment of current meters. The methods used were those outlined in the cruise programme |
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Chief scientist | Alan W Morris (Institute of Marine Environmental Research, Plymouth) |
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Cruise report | (0.13 MB) |
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Ocean/sea areas | |
General | Bristol Channel |
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Track charts | |
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Measurements | |
Physical oceanography | |
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Surface measurements underway (T,S) | Description: continuous surface record, 400nm approx. |
Current meters | Quantity: number of deployments = 1 Description: 1 week |
Chemical oceanography | |
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Phosphate | Description: continuous surface record, 400nm approx. |
Nitrate | Description: continuous surface record, 400nm approx. |
Nitrite | Description: continuous surface record, 400nm approx. |
Ammonia | Description: continuous surface record, 400nm approx. |
Silicate | Description: continuous surface record, 400nm approx. |
Contamination | |
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Suspended matter | Description: continuous surface record, 400nm approx. |
Biology and fisheries | |
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Phytoplankton pigs (eg chlorophyll, fluorescence) | Description: continuous surface record, 400nm approx. |
Dissolved organic matter (inc DOC) | Description: continuous surface record, 400nm approx. |
Zooplankton | Description: survey:population,energy transfers,biomass etc studies |
Benthic bacteria/micro-organisms | Quantity: number of samples = 50 |
Data held at BODC | |
Discrete samples | |
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624 General station with STD/bottles/additional instruments | Nitrite concentration parameters in the water column Salinity of the water column Phosphate concentration parameters in the water column Temperature of the water column Dissolved organic carbon concentration in the water column Silicate concentration parameters in the water column Nitrate concentration parameters in the water column Phaeopigment concentrations in the water column Horizontal velocity of the water column (currents) Chlorophyll pigment concentrations in water bodies
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23 Lowestoft Sampler | Zooplankton taxonomy-related abundance per unit volume of the water column Fish abundance in water bodies
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