|19/04/2022 - 22/05/2022
|TERNON Jean-François , HERBETTE Steven , PENVEN Pierrick , NOYON Margaux
MARINE BIODIVERSITÉ, EXPLOITATION ET CONSERVATION - UMR - SÈTE
Avenue Jean Monnet
34203 Sète Cedex
33 (0)4 99 57 32 00
The RESILIENCE campaign addresses the links between fine oceanic scales such as fronts and eddies and marine life, from phytoplankton to large marine mammals through zooplankton and micronecton, in two main areas, the central Mozambique Channel and the coastal sector of the Agulhas Current. This campaign is the result of the merge of the CYCLOPS and REACTION projects which were planned on the R/V Antea in the first half of 2022. It is a contribution to the Belmont Forum OceanFrontCHANGE project (2020-2023; USA, Kenya, Mozambique, France, Germany; NSF / SIDA / ANR / BMBF; Lead PI Lee Hannah). RESILIENCE is a multi-disciplinary cruise that aims to study the coupling between physics and biology in the fronts of mesoscale eddies of the Mozambique Channel and in the cyclonic eddy trapped off Durban (South Africa). Particular emphasis is placed on the impact of fine-scale physical processes on ocean productivity, on how planktonic communities adapt to these structures and on the consequences for megafauna. The RESILIENCE cruise lasted for 33 days departing and arriving at La Réunion Island and being divided into 3 main actions: the deployment of a deep mooring, fine scale measurements across the fronts in the center of the Canal du Mozambique and fine scale sampling of the Durban cyclonic eddy trapped between the coast and the Agulhas Current.
Most of the observations were carried out continuously at a fine spatial and temporal resolution using a towed vehicle (MVP) for the hydrological (CTD) and biogeochemical (chlorophyll and turbidity) parameters. Stations (hydrology, tracers, phyto and zooplankton) have also been carried out. Along track measurements were performed for current (ADCP) and acoustics (EK80) and for surface parameters (temperature, salinity, fluorometry, PCO2, flux cytometry and multispectral fluorometry). Mesolpelagic trawls have been performed in addition to the acoustic survey. The fronts have been chased in real time using satellite measurements and the cruise plan was oriented accordingly. Complementary observations have been done on seabirds and marine mammals, trace metals in surface water and the carbonate system at the surface and along vertical profiles. RESILENCE has been carried out in close scientific collaboration with scientists from South-Africa and Mozambique. A Floating University (twenty students from three marine universities and two dedicated supervisors) has also been part of the cruise.