Category
Environmental models
Capabilities
MADOC is a process model based on observations and understanding of how soil behaves in response to nitrogen and sulphur inputs. It predicts effects on soil pH (acidity) and dissolved organic carbon flux. MADOC is a dynamic integration of three component models: the UKCEH N14CP model (see separate entry) to simulate organic matter dynamics; Very Simple Dynamic model (VSD developed by Max Posch of IAASA) to simulate cation exchange; and the UKCEH DyDOC model (Dynamics of Dissolved Organic Carbon developed by Ed Tipping) to simulate dissolved organic carbon flux. MADOC can be coupled to other models to study impacts on biodiversity (see MultiMOVE entry) and toxic metals (see IDMM entry).
Lifecycle
MADOC was developed in 2012 by integrating three existing models (N14CP, VSD, DyDOC; see capabilities). Current development of MADOC will integrate the CNP cycling component of the N14CP model for use in Defra (NFC) and UK-SCAPE (SPEED-Metal) projects. Investment to date approx 3 person-years.
Uniqueness
MADOC is unique in simulating: (1) effects of dissolved organic carbon on pH, and vice versa; and (2) chemical delays to air pollution impacts and recovery due to (a) buffering of acidification by the exchange of cations with soil surfaces and (b) buffering of eutrophication by incoporporation of nitrogen into, and release from, soil organic matter.
Partners
MADOC was developed by UKCEH with partners for component models (see separate entries).
Access
MADOC is open access: available to use at no cost by request to the model owner.
Funding sources
Development of MADOC was funded by Defra: Air Quality - Critical Loads and Dynamic Modelling project.
Users
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MADOC is used by UKCEH with Defra and other researchers.
Last updated
11 November 2022 16:27
