RRS John Murray JM9/81 (B/3/81)
Cruise summary report
Cruise Info. | |
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Ship name (ship code) | RRS John Murray (74MJ) |
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Cruise identifier | JM9/81 (B/3/81) |
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Cruise period | 1981-07-15 — 1981-07-21 |
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Status | Completed |
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Port of departure | Plymouth, United Kingdom |
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Port of return | Plymouth, United Kingdom |
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Purpose | Research |
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Objectives | 1) To study the relationships between light, chlorphyll, primary production and flourescence on a CPR route
2) To monitor the performance of the Bristol Channel to update the validation of ecosystem model GEMBASE
3) To carry out a double tow of a Continous Plankton Recorder at the same depth for at least 200 miles to compare their relative catching rates. |
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Chief scientist | Michael B Jordan (Institute of Marine Environmental Research, Plymouth) |
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Cruise report | (0.09 MB) |
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Ocean/sea areas | |
General | English Channel Irish Sea and St. George's Channel Bay of Biscay |
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Track charts | (0.04 MB) |
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Measurements | |
Physical oceanography | |
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Surface measurements underway (T,S) | Description: cont.recording over 240nm approx. |
Water bottle stations | Quantity: number of stations = 11 Description: surface only |
CTD stations | Quantity: number of stations = 11 |
Transparency (eg transmissometer) | Description: cont.recording over 240nm approx. |
Optics (eg underwater light levels) | Quantity: number of stations = 11 |
Chemical oceanography | |
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Nitrate | Description: cont.recording over 240nm approx. |
Contamination | |
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Suspended matter | Description: cont.recording over 240nm approx. |
Biology and fisheries | |
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Primary productivity | Quantity: number of stations = 8 |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Description: cont.recording over 240nm approx. |
Phytoplankton | Quantity: number of samples = 66 Description: identification,distribution |
Meteorology | |
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Incident radiation | Description: cont.for 3d |