Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM1/81 (B/1/81) |
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Cruise period | 1981-01-26 — 1981-02-07 |
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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 continue the series of 5 cruises designed to quantify nutrient cycling processes in Carmarthen Bay, including;
A) Nutrient excretion rates of the zooplankton community.
B) Nurtient demand rates by the phytoplankton in-situ
C) Nutrient regeneration rates by the Benthos
D) Nitrification/dentrification process by bacteria
E) Nutrient advecation and diffusion from surrounding regions to Carmarthen Bay |
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Chief scientist | Peter H Burkill (Institute of Marine Environmental Research, Plymouth) |
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Cruise report | (0.17 MB) |
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Ocean/sea areas | |
General | Irish Sea and St. George's Channel |
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Track charts | |
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Measurements | |
Physical oceanography | |
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Surface measurements underway (T,S) | |
Transparency (eg transmissometer) | |
Current meters | Quantity: number of deployments = 1 Description: 14 days |
Chemical oceanography | |
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Phosphate | |
Total - P | |
Nitrate | |
Nitrite | |
Silicate | |
Contamination | |
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Suspended matter | |
Biology and fisheries | |
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Primary productivity | Quantity: number of stations = 4 |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 50 Description: additionally,cont.recording in the surface |
Particulate organic matter (inc POC, PON) | Quantity: number of stations = 30 |
Dissolved organic matter (inc DOC) | Quantity: number of samples = 100 |
Phytoplankton | Quantity: number of stations = 30 |
Zooplankton | Quantity: number of stations = 30 Description: survey:energy trnasfers,biomass determination,distribution |
Seston | Quantity: number of stations = 30 |
Nekton | Quantity: number of samples = 60 |
Pelagic bacteria/micro-organisms | Quantity: number of stations = 20 |
Other biological/fisheries measurement | Quantity: number of stations = 30 Description: nutrient cycling |
Geology and geophysics | |
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Grab | Quantity: number of samples = 30 Description: physical analysis of sediments |
Core - soft bottom | Quantity: number of cores = 100 Description: chemical analysis |
Data held at BODC | |
Discrete samples | |
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46 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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