Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM5/77 (B/4/77) |
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Cruise period | 1977-05-03 — 1977-05-15 |
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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 | Bristol Channel survey with the following objectives:
1) To measure the spacial 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. |
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Chief scientist | Ian Joint (Institute of Marine Environmental Research, Plymouth) |
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Cruise report | (0.19 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) | Quantity: number of stations = 26 |
Chemical oceanography | |
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Phosphate | Quantity: activity duration in days = 2 Description: every 15 minutes |
Nitrate | Quantity: activity duration in days = 2 Description: every 15 minutes |
Nitrite | Quantity: activity duration in days = 2 Description: every 15 minutes |
Silicate | Quantity: activity duration in days = 2 Description: every 15 minutes |
Contamination | |
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Suspended matter | Quantity: number of stations = 26 |
Other contaminant measurements | Quantity: number of deployments = 1 Description: DRCM for 5 days |
Biology and fisheries | |
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Primary productivity | Quantity: number of experiments = 7 |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 26 |
Dissolved organic matter (inc DOC) | Quantity: number of stations = 26 |
Zooplankton | Quantity: number of stations = 26 Description: distribution,energy transfers |
Pelagic bacteria/micro-organisms | Quantity: number of stations = 3 |
Data held at BODC | |
Discrete samples | |
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586 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 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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30 Lowestoft Sampler | Zooplankton taxonomy-related abundance per unit volume of the water column Zooplankton non taxonomy-related abundance per unit volume of the water column Fish abundance in water bodies
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