Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM11/80 (B/7/80) |
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Cruise period | 1980-10-08 — 1980-10-16 |
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Status | Completed |
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Port of departure | Barry, United Kingdom |
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Port of return | Milford Haven, United Kingdom |
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Purpose | Research |
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Objectives | 1) To continue the series of 5 'MULEX' cruises designed to quantify nutrient cycling processes in Carmarthen Bay, including;
A) Nutrient excretion rates of the zooplankton assemblage.
B) Nutrient demand rates by the phytoplankton assemblage
C) Nutrient regeneration rates by the Benthos
D) Nutrient upflux from sediments
E) Nitrification/dentrification process by bacteria
F) Nutrient advection and diffusion from surrounding regions to Carmarthen Bay
2) To continue the monitoring of the Bristol Channel and Severn Estuary. |
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Chief scientist | R Fauzi C Mantoura (Institute of Marine Environmental Research, Plymouth) |
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Cruise report | (0.14 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) | |
Water bottle stations | Quantity: number of stations = 30 Description: S surface only |
Transparency (eg transmissometer) | Quantity: number of stations = 5 |
Current meters | Quantity: number of deployments = 1 Description: 20 hours |
Chemical oceanography | |
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Phosphate | |
Nitrate | |
Nitrite | |
Ammonia | |
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 stations = 30 |
Particulate organic matter (inc POC, PON) | Quantity: number of stations = 30 |
Dissolved organic matter (inc DOC) | Quantity: number of stations = 30 |
Phytoplankton | Quantity: number of stations = 30 |
Zooplankton | Quantity: number of stations = 16 Description: identification,distribution,energy transfers |
Seston | Quantity: number of stations = 30 |
Pelagic bacteria/micro-organisms | Quantity: number of stations = 15 |
Geology and geophysics | |
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Core - soft bottom | Quantity: number of cores = 30 Description: physical/chemical analysis |