RRS Challenger CH106
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Challenger (74CH) |
| Cruise identifier | CH106 |
| Cruise period | 1993-09-18 — 1993-09-28 |
| Status | Completed |
| Port of departure | Ardrossan, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | Study of flow through North Channel of Irish Sea. (EC-Ref# 930918.0136)
1. To deploy 12 moorings at 6 sites in the North Channel and to service a long term Acoustic Doppler Current Profiler (ADCP). 2. To obtain CTD, nutrient and ship ADCP measurements in the North Channel. 3. To recover 7 Argos/Decca drogued buoys deployed on Challenger 105. 4. To service an ADCP and a current meter/transmissonmeter mooring off Cumbria. 5. To deploy 2 ADCP's and recover 1 of them on the Clyde sill (for Menai Bridge). 6. To deploy and recover trial 75kHz and 1MHz ADCP's. |
| Chief scientist | M John Howarth (Proudman Oceanographic Laboratory) |
| Project | PROFILE 2 |
| Coordinating body | MAST II-0054/EC |
| Cruise report |  (0.39 MB) |
| Ocean/sea areas | |
| General | Inner Seas off the West Coast of Scotland Irish Sea and St. George's Channel |
| Specific | Irish Sea, North Channel |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: activity duration in days = 10 Description: continuous thermosalinograph |
| CTD stations | Quantity: number of profiles = 95 |
| Transparency (eg transmissometer) | Quantity: number of profiles = 95 |
| Current profiler (eg ADCP) | Quantity: activity duration in days = 10 Description: underway shipborne ADCP |
| Surface drifters/drifting buoys | Quantity: number of deployments = 6 Description: tracks from 6 Decca/Argos buoys drogued at 30m over 10d in N. Channel |
| Chemical oceanography | |
| Phosphate | Quantity: number of profiles = 95 |
| Nitrate | Quantity: number of profiles = 95 |
| Nitrite | Quantity: number of profiles = 95 |
| Ammonia | Quantity: number of profiles = 95 |
| Silicate | Quantity: number of profiles = 95 |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Subsurface temperature measurements | 54° 46' 0" N 5° 25' 0" W — thermistor chain deployed and recovered |
| Subsurface temperature measurements | 54° 40' 0" N 5° 15' 0" W — thermistor chain deployed - lost |
| Transparency (eg transmissometer) | 54° 7' 0" N 3° 27' 0" W — Transmissometer (2) recovered and deployed |
| Current meters | 54° 7' 0" N 3° 27' 0" W — Current meter (2) recovered and deployed |
| Current meters | 54° 46' 59" N 5° 16' 59" W — current meter rig deployed (4 meters), recovered by fishing vessel 29 Oct 93 |
| Current meters | 54° 46' 0" N 5° 25' 0" W — current meter deployed and recovered |
| Current meters | 54° 46' 0" N 5° 28' 0" W — current meter and moored ADCP deployed |
| Current profiler (eg ADCP) | 55° 0' 0" N 5° 30' 0" W — ADCP deployed |
| Current profiler (eg ADCP) | 54° 52' 0" N 5° 12' 0" W — ADCP deployed; current meter rig deployed and recovered |
| Current profiler (eg ADCP) | 54° 46' 0" N 5° 24' 0" W — ADCP and pressure recorder recovered and deployed |
| Current profiler (eg ADCP) | 54° 7' 0" N 3° 27' 0" W — ADCP recovered and deployed |
| Current profiler (eg ADCP) | 55° 22' 0" N 5° 25' 59" W — ADCP deployed |
| Sea level (inc. bot. press., inverted echosounder) | 55° 0' 0" N 5° 30' 0" W — Pressure recorder, with ADCP above, deployed |
| Instrumented wave measurements | 54° 46' 0" N 5° 25' 0" W — Wave rider deployed - lost |
| Meteorology | |
| Other meteorological measurements | 54° 46' 0" N 5° 25' 0" W — Met.buoy deployed |
| Data held at BODC | |
| Discrete samples | |
| 95 CTD frame plus rosette sampler | Transmittance and attenuance of the water column Salinity of the water column Temperature of the water column Visible waveband radiance and irradiance measurements in the water column Raw light meter output Density of the water column Raw fluorometer output |
| 7 Sample taken from ship's non-toxic supply | Salinity of the water column |
