{"access":"MADOC is open access: available to use at no cost by request to the model owner.","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).","description":"MADOC predicts the effects of nitrogen and sulphur deposition (from air pollution) on soil acidity and carbon uptake and/or emissions.  It is used by researchers to project future impacts of, and recovery from, air pollution on ecosystems and ecosystem services, such as: (1) acidification and eutrophication (for Defra); (2) biodiversity (here MADOC is coupled to MultiMOVE: see separate entry); (3) heavy metal solubility and soil concentrations (here MADOC is coupled to IDMM: see separate entry).","fundingSources":"Development of MADOC was funded by Defra: Air Quality - Critical Loads and Dynamic Modelling project.","id":"0504a896-a971-41ce-ab67-449bf2b49b80","infrastructureCategory":{"value":"models","description":"Environmental models","infrastructureClass":"Digital infrastructures","uri":"http://vocabs.ceh.ac.uk/ri/model"},"infrastructureChallenge":[{"value":"Pollution"},{"value":"Climate change: mitigation"}],"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.","metadataDate":"2025-04-09T09:24:37","onlineResources":[{"url":"https://github.com/NERC-CEH/MADOC","function":"website","type":"OTHER"}],"owners":[{"displayName":"Ed Rowe","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"owner","email":"enquiries@ceh.ac.uk","fullName":"Ed Rowe"}],"partners":"MADOC was developed by UKCEH with partners for component models (see separate entries).","resourceIdentifiers":[{"code":"https://catalogue.ceh.ac.uk/id/0504a896-a971-41ce-ab67-449bf2b49b80"}],"scienceArea":"Soils and Land Use","title":"Model of Acidity Dynamics and Organic Carbon (MADOC)","type":"infrastructureRecord","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.","uri":"https://catalogue.ceh.ac.uk/id/0504a896-a971-41ce-ab67-449bf2b49b80","users":["MADOC is used by UKCEH with Defra and other researchers."]}