Theme 2: Ecosystem impacts, acclimation and adaptation CO2 Climate relevant gases WP5 WP8Trophic interactions Ocean chemistry Autotrophic processes WP7 Microbial activity WP4-8 Adaptation WP4 Biocalcification Nutrient availability WP6 Reproduction & growth WP9 From process studies to ecosystem models • Theme 2 Ecosystem impacts, acclimation and adaptation • WP4 Sensitivity of calcification (D. Iglesias-Rodriguez) • WP5 Sensitivity of autotrophic processes (U. Riebesell) • WP6 Performance: reproduction and growth (H.-O. Pörtner) • WP7 Microbial diversity and activity, in particular nitrogen cycling (J. Middelburg) • WP8 Impact on trophic interactions (F. Thingstad) • WP9 From process studies to ecosystem models (A. Oschlies)
Theme 2 - Key Questions What are the effects of ocean acidification and related changes in seawater chemistry on marine organisms, what are the underlying mechanisms of the observed responses and the potential for adaptation, how are they modulated by other environmental stressors, and what are the consequences for marine ecosystems and ocean biogeochemical cycles?
Theme 2 - Approaches • Lab and mesocosm CO2 perturbation experiments • combined with • Physiological and molecular techniques • Analysis of trophic interactions • Biogeochemical approaches • Meta-analysis of process studies • Combined modelling and data assimilation
joint mesocosm experiment in the high Arctic at Ny Alesund, Svalbard, May 2009
joint mesocosm experiment in the high Arctic at Ny Alesund, Svalbard, May 2009 Mesocosm mooring site
Winter / Frühjahr joint mesocosm experiment in the high Arctic at Ny Alesund, Svalbard, May 2009 Pelagic mesocosm CO2 enrichment experiment pCO2 (µatm) 720 1040 550 860 1200 380 Benthic mesocosm CO2 perturbation experiments
Winter / Frühjahr joint mesocosm experiment in the high Arctic at Ny Alesund, Svalbard, May 2009 Ny Alesund in May Why high Arctic? carbonate sub-saturation will first occur in high latitudes Why Ny Alesund? northern-most research station, excellent logistical support