A first main task of this work package is the advancement of techniques for creating future environmental conditions in terms of both realism and cost, with a focus on warming and CO2 enrichment. In designing realistic warming experiments, we aim to identify potential artifacts associated with currently used methods to increase temperatures such as greenhouses, infrared heaters and monolith translocation and propose solutions to minimise errors. This includes unwanted secondary artifacts such as changes in (soil and air) moisture conditions. Computational Fluid Dynamics will mainly be used to create spatial CO2 concentration gradients over large areas, but the technique could also be used for imposing temperature increases. A second task involves designing new approaches for experimental ecosystems, including model analogues of large-scale systems (e.g. oceans) and studying whether we can define a standardised ecosystem that includes the most appropriate biotic and abiotic components. A final task is to design new biodiversity and climate change experiments using knowledge gained from the other tasks and with the goal to design experimental approaches that are more realistic and more generalisable than past attempts.
> Participant involved : INRA - CNR - CNRS - FSU JENA - Imperial - KIT - UA - UFZ - UP
A modelling toolkit including dynamic ecosystem models and plant community dynamics will be developed and made available for the users of the infrastructure. The toolkit will include a parameter library, models of hydrological and biogeochemical dynamics, vegetation dynamics/species interactions as well as evaluations tool for uncertainty estimations. Models will be chosen that are well documented and tested. A model parameter library will be developed based on freeware global parameter databases and existing model applications and parameter sets tested and enhanced and parameter uncertainties assessed. A dynamic vegetation modeling component will be developed with improved integration of dynamic vegetation processes into ecosystem hydrology and biogeochemistry models. A model toolbox/workspace will be developed for the site owners to easily get access to these models, parameter settings and documentation. This workspace will include enhanced ecosystem models representing hydrological, biogeochemical and dynamic vegetation components and evaluation tools to provide scientific testing of hypotheses and extrapolation of results from the experiments. A simple-to-use system of evaluating model performance will be included with a menu-driven series of options to run the models with new or different parameter sets. The workspace will include all relevant model documentation (design, links to data and parameter settings and model outputs), manuals and instructions (theoretical basis, user guide, variables, inputs and outputs and model connections) and the ecosystem specific parameter library. The use of the workspace will be provided through involvement of the site researchers and users through workshops and training courses.
> Participant involved : INRA - DTU - KTH - NERC - ULUND
In this workpackage “upscaling tools” will be developed to assess the potential of the ExpeER infrastructure to upscale ecosystem responses to environmental changes at large scales. It extends the work in WP9 by providing complementary numerical tools based on model-data fusion approaches. The work that will be carried out can be divided into three categories :
> Participant involved : CNRS - Jülich - UFZ - UHEL - UNIVLEEDS