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Dynamics of a linked Higher and Lower Trophic Level System in the North Sea Jonathan Beecham Steven Mackinson John Aldridge Jorn Bruggeman Ecopath with Ecosim handles higher trophic level feeding and fishery interactions Mammals Fish Birds Benthos Bacteria Consumption rate of fish on zooplankton (Total consumed or rate) Zoops (Z3, Z4) Phytes Benthos Zoops Phytes Flows to detritus (deaths) PATTERN VALIDATION Zoop prey availability (biomass per month or production rate) Detritus Nutrient, organic matter fate and recycling Bacteria Detritus Nutrients Biogeochemical process model (GOTM‐BFM), handles lower trophic level feeding interactions & nutrient dynamics Xml Specification Approach (TCP) Repository of Canonical Descriptions EwE Model .xsd .xsd .xsd .xsd Template Template (BFM) (BFM) Template Template (EwE) (EwE) EwE.xml EwE.xml GOTM‐BFM model Interface Interface spec spec Dictionary BFM.xml BFM.xml Optional TCP Link Interface (plugin) Couplerlib Interface (Python) Couplerlib Ersem Phytoplankton Groups Flagellates Diatoms Dinoflagellates Mesozooplankton groups in ERSEM Ominivorous Mesozooplankton Carnivorous Mesozooplankton Nutrients in ERSEM model Pelagic N Benthic N Pelagic Si Pelagic P Mesozooplankton in Ecosim Pelagic Species in Ecosim Benthic Species in Ecosim Areas for Component Model Development • Seasonality in Ecosim / Ecospace. • Nutrient reserves model in Ecosim. • Understanding Silicon / Diatom dynamics in LTL models. • Modelling of over‐winter survival of Zooplankton. • Seasonal Modelling of Marine Homeotherms. Conclusions • Couplerlib with metadata enables us to link models with different data representation. • Pelagic Linking is easier then Benthic • Need to consider whether models are compatible in terms of variation • Fixed versus plastic seasonality may be an issue. • Need for linked model calibration. Acknowledgments • This work was funded by the EU FP7 MEECE program, with additional financial support from the Cefas seedcorn fund. • Mark Platts (plots). Piet Ruadij. Thanks to Carl Walters, Villy Christensen, Sherman Lai and Joe Buszowski.
