SOGIR 00
| Type | Oceanographic cruise |
|---|---|
| Set | This cruise is part of the set SOGIR |
| Ship | Cote D'Aquitaine |
| Ship owner | CNRS |
| Dates | 31/01/2000 - 09/11/2000 |
| Chief scientist(s) | CASTAING Patrice, LECONTE Michel |
ENVIRONNEMENTS ET PALÉOENVIRONEMENTS OCÉANIQUES ET CONTINENTAUX (EPOC) - TALENCE UMR CNRS 5805 EPOC - OASU - Université de Bordeaux Bâtiment A12 351 Cours de la Libération 33405 TALENCE CEDEX +33 (0)5 40 00 36 15 |
|
| DOI | 10.17600/410060 |
| Objective | Acquisition of data needed by the Coastal zone observation service (CNRS/INSU/SOMLIT) and for the Ecological monitoring service at the Le Blayais site (EDF) to ensure long-term monitoring of the Gironde estuary, begun in 1978. Better understanding of the seasonal variability of studied parameters arising from sudden events (floods) or more gradual phenomena (atmospheric warming, river flow rates) at 4 stations located along the estuary. This falls under the coastal environment observation service (CNRS/INSU/SOMLIT) project. The cruise took place over several periods: 31/01-02/02, 13-15/03, 10-13/04, 08-11/05, 12-16/06, 17-20/07, 04-08/09, 25-29/09, 16-20/10 and 06-09/11. The Coastal zone observation service (SOMLIT) federating the marine stations at Wimereux, Roscoff, Brest, Arcachon, Banyuls, Villefranche-sur-Mer and Marseille, aims to record the long-term trends in coastal ecosystems subject to anthropogenic or climatic influences. In this context, a scientific programme to monitor long-term trends in the Gironde estuary was implemented. Studying annual and interannual variability - which is one of the main objectives of the observation service - requires taking samples throughout the year (impact of winter floods on the hydro-sedimentology and on the biological cycle of zooplankton species). SOMLIT is based on a coherent network of measurement points (in number and location) to sample neritic and estuarine waters. On each mission, ten times a year, samples are taken at 4 stations at a set point during a tidal cycle under comparable tidal conditions (neap tide). Samples are taken four times, at intervals of about 2 to 3 hours: 1 at high water, 2 tides, 1 at low water, and at two levels: 1 m below the surface and 1 m above the seabed. |
