T, light/UV, mixing, Fe, Si, …. Climate change C export CO 2, CH 4, COV CH 3 I DMS DMSe N2ON2O aérosols Structure of the phytolankton community CHX General.

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Presentation transcript:

T, light/UV, mixing, Fe, Si, …. Climate change C export CO 2, CH 4, COV CH 3 I DMS DMSe N2ON2O aérosols Structure of the phytolankton community CHX General objective: To contibute to improve our understanding and prediction of the response of the Southern Ocean to the global climate change bacteria virus zooplankton bacteria virus zooplankton

General objective of KEOPS: To contibute to improve our understanding and prediction of the response of the Southern Ocean to climate change. specific objectives  Identification of the mecanisms of natural iron fertilisation of the Kerguelen Plateau.  Flux studies in contrasting environments:  Process studies: To improve the knowledge of the biogeochemical processes involved in the C0 2 biological pump and biogas production, focusing on their responses to change in forcing parameters: iron supply, statrification, light (visible and UV),

 specific objective : Identification of the mecanisms of natural iron fertilisation of the Kerguelen Plateau. Which mechanisms are responsible for the enrichment of deep water with iron?  Contact with the margin when deep waters circulates around the plateau  Remineralisation of sinking biogenic material after a massive bloom  Release from the shelf sediment  Dissolution of lithogenic particles issued from island What is the major mechanism of the upward transfer of iron from deep waters to the surface layer?  Strong interaction between tidal currents and the bottom topography generates internal tides activity tranfering deep waterto the surface.

0 m Strategy for objective 1 Temperature measured using sensors attached to pengins (Chassarin et al. 2001) 100 m 150 M 2 1 A1 A11 B11 C11 B1 C1 A5 B5 C5 Transect A Transect B Transect C

 specific objective: Flux studies in contrasting environments: Quantification of the flux of gases and aerosols at the ocean atmophere interface. We will focuse on gases important in atmospheric chemistry and climate and on aerosol as a source of iron to the ocean. Quantification of the flux of carbon exported below the depth ofthe winter mixed layer.

Strategy for objective 2 Parameters Gases: CO 2, DMS, DMSe, CH 4, CO, N 2 O, CHNM, CHX, CHNO 3. Aerosols: Carbon export: POC, PON, BSi, CaCO 3, Ba, 234 Th, 230 Th, 232 Th, delta ( 13 C, 15 N, 30 Si ). Two contrasting environments

 Process studies: To improve the knowledge of the biogeochemical processes involved in the C0 2 biological pump and biogas production, focusing on their responses to change in forcing parameters: iron supply, statrification, light (visible and UV), Characterization of phytoplankton community: What physical and chemical factors regulate phytoplankton growth and species composition. Shifts in the structure of the phytoplankton communities in response to changes in the forcing parameters : iron light (visible and UV), stratification. Do biological activity compete with photochemical process for the production of biogenic gases and iron speciation?

Strategy for objective 3 In situ observations in the two contrasting environments and along the gradients. On Board Experiments (OBEX)  OBEX 1: Factors controling the growth of microbial community.  OBEX 2: The impact of grazing on the iron speciation and the production of gases.  OBEX 3: The impact of bacterial degradation and solar radiation on iron speciation and the production of biogenic gases.  OBEX 4: The impact of viral lysis on iron speciation and bioavailability.

Foreign participations NIOZ (NL) CSIRO and ACE CRC. UVB NIWA (NZ) Cliff Law (biogenic gases)

Changes in nitrous oxide production stimulated by biological response to Fe addition during SOIREE (Law et al, 2001) Development of [N2O]max coincident with integrated chlorophyll during SOIREE Increase in [N2O] max at base of mixed layer during SOIREE And also CH 4 and CO.

Foreign participations NIOZ (NL) CSIRO and ACE CRC. UVB NIWA (NZ) Cliff Law (biogenic gases) NIWA (NZ) Phil Boyd (iron phytoplankton dynamics) Univ. Delaware Dave Hutchins ? (phytoplankton, chemostat with change in forcing parameters, Fe, pCO2…)