Project presentation - Non-belspo IRONAGES - Iron
Resources and oceanic nutrients-Advancement of Global Environment
Simulations Project description The work outlined seeked to better model marine ecosystems and the sources and sinks of C, N and other elements within those systems, assuming that a number of factors (notably light, N, P, Si, Fe) are co-limiting plankton blooms. This goal had to be achieved through a combination of laboratory experiments, fieldwork and modelling. Laboratory work targeted the predominant algal species of the major taxonomic groups to determine their growth as a function of multiple stresses, such as limitations of iron, light and macronutrients. This data had then to be used to refine and improve ocean ecosystem models, with the aim to more accurately replicating observations of the natural system.
(I) co-limitation by 4 nutrients of 5 major taxonomic classes
of phyto-plankton, Input from below of iron from anoxic sediments
of coastal margins had to be assessed along a 2-D vertical section from Europe
into the centre of the north Atlantic. Input from above of Fe (II)
dissolved in rainwater from Sahara dust blown over the central
Atlantic had to be quantified at sea, and related to observed
plankton production, CO2 gas exchange and DMS emission. Different
chemical forms of iron had to be analysed and rigorous certification
of all Fe in seawater data had to be ensured. For 2 major DMS-producing
algal groups the life cycle, Fe limitation, export production,
CO2 uptake and DMS emissions had to be synthesised from existing
literature and laboratory experiments. Experimental data had
to be fed into an ecosystem model. Also DMS (P) pathway modeling
had to be carried out being expanded with 3 other groups of
algal and DMS (P) pathways. The extended ecosystem model had
to provide reliable output for CO2/DMS gas exchange being implemented
into two existing OBCM' s. Next climate change scenario' notably
changes in Fe inputs, had to be run, with special attention to
climatic feedback (warming) on the oceanic cycles and fluxes. Complementary resources about this scientific project www.nioz.nl/nioz_nl/d0e54483aa31c55b01a9fb11c0c23df4.php Project team Coordinator: Prof. Dr. Ir. H.J.W. de Baar Involved research group: Dr. Christiane Lancelot Prof. Dr. Dieter Wolf-Gladrow Prof. Tim Jickells Prof. Paul Treguer /Prof. Stephane
Blain Prof. Paul Worsfold Prof. CMG van den Berg Dr. Winfried Gieskes Dr Diana Ruiz-Pino Dr. Julie La Roche Prof. Dr. Ernst Maier-Reimer Dr. Patrick Monfray |
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