RRS Challenger CH76
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Challenger (74CH) |
| Cruise identifier | CH76 |
| Cruise period | 1991-03-06 — 1991-04-02 |
| Status | Completed |
| Port of departure | Troon, United Kingdom |
| Port of return | Barry, United Kingdom |
| Purpose | Research |
| Objectives | The aims of the cruise were to investigate the biogeochemistry and possible photochemistry of a number of trace elements (including aluminium, copper, nickel, zinc, titanium, platinum and chromium) in oceanic waters. This part of the North Atlantic was selected for this study as it can be reached comparatively easily from the UK, and as it provides waters of varied origin. Possible photochemical effects and effects related to biological activity can be compared in the cold waters from the North with the warmer waters further south. Chromium was added later to the list of elements studies as this element is particularly interesting for photochemical aspects of this study because of its occurrence in two oxidation states. |
| Chief scientist | C M G Van den Berg (University of Liverpool Department of Earth Sciences) |
| Cruise report |  (0.61 MB) |
| Ocean/sea areas | |
| General | North East Atlantic Ocean (limit 40W) |
| Specific | along 20degW between 53degN and 30degN |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Water bottle stations | Quantity: number of stations = 13 |
| CTD stations | Quantity: number of stations = 19 |
| Transparency (eg transmissometer) | Quantity: activity duration in days = 27 Description: continuous measurement from non-toxic supply |
| Chemical oceanography | |
| Oxygen | Quantity: number of stations = 19 |
| Oxygen | Quantity: number of stations = 13 |
| Nitrite | Quantity: number of stations = 13 |
| Ammonia | Quantity: number of stations = 13 |
| Silicate | Quantity: number of stations = 13 |
| Trace elements | Quantity: number of stations = 13 |
| Other chemical oceanographic measurements | Quantity: number of stations = 13 |
| Contamination | |
| Trace metals | Quantity: number of stations = 13 Description: Cu, Ni, Cr, Pt, Ti, Al, Fe and V by voltammetry |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: activity duration in days = 27 Description: continuous measurement from non-toxic supply |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 19 |
