RRS John Murray JM9/81 (B/3/81)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS John Murray (74MJ) |
| Cruise identifier | JM9/81 (B/3/81) |
| Cruise period | 1981-07-15 — 1981-07-21 |
| Status | Completed |
| Port of departure | Plymouth, United Kingdom |
| Port of return | Plymouth, United Kingdom |
| Purpose | Research |
| 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. |
| Chief scientist | Michael B Jordan (Institute of Marine Environmental Research, Plymouth) |
| Cruise report |  (0.09 MB) |
| Ocean/sea areas | |
| General | English Channel Irish Sea and St. George's Channel Bay of Biscay |
| Track charts | (0.04 MB) |
| Measurements | |
| Physical oceanography | |
| 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 | |
| Nitrate | Description: cont.recording over 240nm approx. |
| Contamination | |
| Suspended matter | Description: cont.recording over 240nm approx. |
| Biology and fisheries | |
| 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 | |
| Incident radiation | Description: cont.for 3d |
