Pourquoi pas? GEOVIDE (GA01)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | Pourquoi pas? (35PK) |
| Cruise identifier | GEOVIDE (GA01) |
| Cruise period | 2014-05-15 — 2014-06-30 |
| Status | Completed |
| Port of departure | Lisbon, Portugal |
| Port of return | St. John's, Canada |
| Purpose | Research |
| Objectives | GEOVIDE, An international GEOTRACES study along the OVIDE section in the North Atlantic and in the Labrador Sea
Understanding the ocean chemistry of trace elements and their isotopes (TEIs) will improve our ability to probe the past and present ocean system. Some TEIs are toxic for the environment, while others serve as essential micronutrients. Their interactions with the marine food web strongly depend on their chemical (organic and redox) and physical (particulate/colloidal/dissolved) speciation, with continuous exchange between these phases. Some TEIs are also diagnostic and allow the quantification of specific oceanic mechanisms that can hardly or not be investigated by direct measurements. TEIs provide constraints and flux estimates that can also be exploited to reconstruct past environmental conditions, and to estimate the possible amplitude of future climate changes. Despite all these major implications, the distributions, sources, sinks and internal cycling of TEIs are still largely unknown because of the lack of appropriate sampling and (up to very recently) the insufficient sensitivity of the analytical tools. Recent advances now provide the marine biogeochemist community with a great opportunity to make substantial contributions to the understanding of the oceanic system. It is in this general context that the international GEOTRACES programme intends to characterize the TEI distributions throughout a Global Survey, consisting of ocean sections, and regional process studies, using a multi-proxy approach. The proposed GEOVIDE section will be the French contribution to this Global Survey in the North Atlantic Ocean. Objectives 1. Better know and quantify the MOC and the carbon cycle in a decadal variability context, adding new key tracers. 2. Map the TEI distribution with their physical and chemical speciation along a full-depth high resolution ocean section. 3. Investigate the link between the TEIs, and the production, export and remineralisation of particulate organic matter. 4. Identify the TEI sources and sinks and quantify their fluxes at the ocean boundaries. 5. Better understand and quantify the paleoproxies 231Pa/230Th, Nd, and 30Si. |
| Chief scientist | Géraldine Sarthou (Laboratory of Marine Environmental Science (UMR CNRS 6539)) |
| Project | GEOTRACES -Trace elements and their isotopes in the water column |
| Cruise report |  (3.65 MB) |
| Ocean/sea areas | |
| General | North Atlantic Ocean Labrador Sea (Davis Strait) |
| Specific | North Atlantic along the OVIDE section and in the Labrador Sea |
| Track charts | (0.24 MB) |
| Data held at BODC | |
| Discrete samples | |
| 18 Atmospheric air sampling pump | Sulphur species concentrations in the atmosphere Metal concentrations in the atmosphere Inorganic phosphorus species concentrations in the atmosphere Concentration of nitrogen species in the atmosphere Concentration of inorganic halogens in the atmosphere |
| 165 CTD frame plus rosette sampler | Salinity of the water column Temperature of the water column Vertical spatial coordinates Dissolved oxygen parameters in the water column Radioactivity in water bodies |
| 10 Rain water collector | Precipitation chemistry |
| 15 Stand-alone pumps | |
| 54 | Dissolved metal concentrations in the water column Salinity of the water column Temperature of the water column Vertical spatial coordinates Dissolved oxygen parameters in the water column Total metal concentrations in water bodies Radioactivity in water bodies |
