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= Unified Model =

The Met Office [http://www.metoffice.gov.uk/research/modelling-systems/unified-model Unified Model] (UM) is the name given to the suite of numerical modelling software developed and used at the Met Office. The UM modelling software is designed so that the model can be run in atmosphere-only (global or limited area), ocean-only or in coupled atmosphere-ocean mode. 

The Unified Model is used by the [http://www.metoffice.gov.uk UK Met Office] for operational numerical weather prediction and by the [http://www.metoffice.gov.uk/climate-change/resources/hadley Hadley Centre for Climate Prediction and Research] to simulate and predict the Earth's climate.

== Running the UM ==

The UM is a complex software sytem so a new user should read the documentation available on this web site and complete the [wiki:UmTraining UM training] provided by NCAS.

The UM software needs to be properly installed so that the scripts, tools, code and files for running an experiment are available. NCAS installs and maintains the supported UM versions on the UK national high performance computers. All NCAS researchers can use the UM on these services, details of getting accounts can be found [wiki:FAQ_T3_F6 here]

Instructions for running a UM experiment on ARCHER can be found at the following links: 
* [wiki:UM/RunningUMOnArcher Getting started with the UMUI]
* [wiki:RoseCylc Getting started with Rose]

UM experiments need input files to run and they create output files for diagnosing the experiment. NCAS has created a set of [wiki:ToolsAndUtilities/UmFileTools tools and utilities], to supplement the standard ones from the UK Met Office, to support the creation, manipulation and use of these UM files. 

== UM versions ==

The UM undergoes significant changes as new scientific enhancements are introduced or new features are added, and so the [http://www.metoffice.gov.uk Met Office] release new versions regularly (approx. 3-4 times a year). NCAS-CMS only supports a subset of the versions that have been released. See the [wiki:FAQ_T0_F12 supported versions] page for the list of supported UM versions and platforms.

From UM version 10.0, the old UM user interface (UMUI) was replaced by the [wiki:RoseCylc Rose/cylc] application management and workflow system. This provides a much more flexible and powerful way of controlling UM experiments. 

Documentation relating to new UM versions (from vn10.0), including the UM User Guides, is available on the Met Office Science Repository Service (MOSRS) [http://cms.ncas.ac.uk/wiki/Docs/MetOfficeDocs here]. Note you must be registered to access this service. ContactUs for information on getting an account. Documentation for older UM versions (before vn10.0) is available [http://cms.ncas.ac.uk/wiki/Docs/MetOfficeDocs here]. 

== UM Configurations ==

=== Climate Configurations ===

In order to run the climate model, users need to have access to a set of files that will enable them to run a particular scientific version of the climate model (describing exactly the physical and dynamical choices within the UM system). Two climate model 'families' (HadGEM2 and HadGEM3) are routinely used by academic researchers. Only HadGEM3 is still actively developed by the Met Office Hadley Centre. These models differ very significantly in terms of their numerical and physical formulation. The Met Office have released several configurations of these models and NCAS-CMS have ported certain "standard" configurations to the National HPC system ARCHER. 

See [wiki:UM/Configurations UM Configurations] page for full details.

=== Parallel Suites and NWP Configurations ===

See [wiki:UM/ParallelSuites Parallel Suites] page

== Mesoscale Modelling ==

Information specific to Mesoscale Modelling can be found [wiki:UM/MesoscaleModelling here].

== The Single Column Model ==
This will explain how to run the Met Office Single Column model on various computer types.

See [wiki:/UM/SingleColumnModel Single Column Model]


== Source Code and STASHmaster Browsers ==

The UM Fortran source code is available to to view via the [https://puma.nerc.ac.uk/trac/UM/browser UM Trac Code Browser] or alternatively, the UM source code has been converted into a hyperlinked website. 

See [wiki:/UM/CodeBrowsers UM Source Code Browsers]