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This can (but need not) include thermal processes (especially ice for frozen soils), evapo-transpiration, surface energy exchange with the atmosphere, snow, deformation, gray and green infrastructure, and much more.  In addition, we solve problems of reactive transport in both the subsurface and surface, leveraging external geochemical engines through the Alquimia interface.\n\nATS is a suite of physics processes built for Amanzi.  Amanzi includes the underlying mesh, data structure, multi-physics APIs, and math libraries for defining and solving the physics implemented in ATS.\n\nJoin the Community\n------------------\n\nATS is more than just a code, but a community of users with a lot of experience in both integrated hydrology, Arctic hydrology, reactive transport, and ATS code development.  Please join us on our [google group](https://groups.google.com/forum/#!forum/ats-users).  We try very hard to create a welcoming community that supports and enables our users to do their science.\n\n\nInstallation\n------------\n\nATS is now built as a part of Amanzi directly. Please see the [ATS installation instructions](https://github.com/amanzi/amanzi/blob/master/INSTALL_ATS.md) on Amanzi's site.\n\nDocumentation\n-------------\n\nOur [Documentation](https://amanzi.github.io/ats/) covers the input spec, and is motivated by a large suite of [Demos](https://github.com/amanzi/ats-demos).\n\nSee also our [Wiki](https://github.com/amanzi/ats/wiki) and [Frequently Asked Questions](https://github.com/amanzi/ats/wiki/FAQs), or take our online [Short Course](https://github.com/amanzi/ats-short-course).\n\nSetting up watershed- and river basin-scale problems is frequently done through [Watershed Worfklow](https://environmental-modeling-workflows.github.io/watershed-workflow/), a workflow tool that downloads and adapts a wide variety of open data for this purpose.\n\n\nLicense and Copyright\n---------------------\n\nPlease see the [LICENSE](https://github.com/amanzi/ats/blob/master/LICENSE) and [COPYRIGHT](https://github.com/amanzi/ats/blob/master/COPYRIGHT) files included in the top level directory of your ATS download.\n\nCitation\n--------\n\nIn all works, please cite the code:\n\nE.T. Coon, M. Berndt, A. Jan, D. Svyatsky, A.L. Atchley, E. Kikinzon, D.R. Harp, G. Manzini, E. Shelef, K. Lipnikov, R. Garimella, C. Xu, J.D. Moulton, S. Karra, S.L. Painter, E. Jafarov, and S. Molins. 2020. Advanced Terrestrial Simulator. U.S. Department of Energy, USA. Version 1.0. [DOI](https://doi.org/10.11578/dc.20190911.1)\n\nAdditionally, consider citing one or more of the below, depending upon the application space:\n\n**Watershed Hydrology:** Coon, Ethan T., et al. \"Coupling surface flow and subsurface flow in complex soil structures using mimetic finite differences.\" Advances in Water Resources 144 (2020): 103701. [DOI](https://doi.org/10.1016/j.advwatres.2020.103701)\n\n**Arctic Hydrology:** Painter, Scott L., et al. \"Integrated surface/subsurface permafrost thermal hydrology: Model formulation and proof‐of‐concept simulations.\" Water Resources Research 52.8 (2016): 6062-6077. [DOI](https://doi.org/10.1002/2015WR018427)\n\n**Reactive Transport:**  Molins, Sergi, et al. \"A Multicomponent Reactive Transport Model for Integrated Surface‐Subsurface Hydrology Problems.\" Water Resources Research 58.8 (2022): e2022WR032074. [DOI](https://doi.org/10.1029/2022WR032074)\n\n**Multiphysics Modeling:** Coon, Ethan T., J. David Moulton, and Scott L. Painter. \"Managing complexity in simulations of land surface and near-surface processes.\" Environmental modelling \u0026 software 78 (2016): 134-149. 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