FRV Mara 8B/70
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | FRV Mara (74MR) |
| Cruise identifier | 8B/70 |
| Cruise period | 1970-10-02 — 1970-10-09 |
| Status | Completed |
| Port of departure | Buckie, United Kingdom |
| Port of return | Buckie, United Kingdom |
| Purpose | Research |
| Objectives | 1) Comparison of surface spectral irradiance using the quantaspectrometer (DAFS) and the Gamma spectrophotometer (MAFF).
2) Determination of beam attenuation coefficient by the use of the meter and by taking black body readings. 3) Measurement of diffuse attenuation coefficient by the twin cell selenium-cell photometer and by vertical target settings. 4) Determination of underwater visibilities using standard techniques and photographs of targets, taken for densitometric analysis. |
| Chief scientist | C C Hemmings (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
| Cruise report |  (0.13 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Specific | Off Buckie, mouth of Cromarty Firth |
| Measurements | |
| Physical oceanography | |
| Optics (eg underwater light levels) | Quantity: activity duration in days = 7 Description: A photometry programme took place during the final week 5 miles off the coast of Buckie. |
| Biology and fisheries | |
| Gear research | Quantity: number of measurements = 1 Description: Sea trials of the 'Towed Underwater Vehicle' mock-up took place. No. of trials not specified. |
| Gear research | Quantity: activity duration in days = 7 Description: A seine net programme took place in cooperation with FRV Clupea |
