NorESM1 is the Norwegian Earth System model used for CMIP5. The model is based on the CCSM framework ( However, NorESM has special features developed by Norwegian researchers.

Main references are:

GMD - Special issue The Norwegian Earth System Model: NorESM; basic development, validation, scientific analyses, and climate scenarios

Bentsen, M., I. Bethke, J. B. Debernard, T. Iversen, A. Kirkevåg, Ø. Seland, H. Drange, C. Roelandt, I. A. Seierstad, C. Hoose, and J. E. Kristjansson (2013): The Norwegian Earth System Model, NorESM1-M. Part 1: Description and basic evaluation of the physical climate, Geosci. Model Dev., 6, 687-720, doi:10.5194/gmd-6-687-2013

Iversen, T., M. Bentsen, I. Bethke, J. B. Debernard, A. Kirkevåg, Ø. Seland, H. Drange, J. E. Kristjansson, I. Medhaug, M. Sand, and I. A. Seierstad (2013): The Norwegian Earth System Model, NorESM1-M – Part 2: Climate response and scenario projections, Geosci. Model Dev., 6, 389-415, doi:10.5194/gmd-6-389-2013

Kirkevåg, A., T. Iversen, Ø. Seland, C. Hoose, J. E. Kristjánsson, H. Struthers, A. M. L. Ekman, S. Ghan, J. Griesfeller, E. D. Nilsson, and M. Schulz (2013): Aerosol–climate interactions in the Norwegian Earth System Model – NorESM1-M, Geosci. Model Dev., 6, 207-244, doi:10.5194/gmd-6-207-2013

Tjiputra, J. F., C. Roelandt, M. Bentsen, D. M. Lawrence, T. Lorentzen, J. Schwinger, Ø. Seland, and C. Heinze (2013): Evaluation of the carbon cycle components in the Norwegian Earth System Model (NorESM), Geosci. Model Dev., 6, 301-325, doi:10.5194/gmd-6-301-2013

The next version of the model NorESM2 is built on a update version of the CCSM framework, CESM2. ( ; ( Its aerosol module is based on OsloAero5.3 of NorESM1.2 / CAM5.3-Oslo, documented here:

Kirkevåg, A., A. Grini, D. Olivié, Ø. Seland, K. Alterskjær, M. Hummel, I. H. H. Karset, A. Lewinschal, X. Liu, R. Makkonen, I. Bethke, J. Griesfeller, M. Schulz, and T. Iversen (2018): A production-tagged aerosol module for Earth system models, OsloAero5.3 – extensions and updates for CAM5.3-Oslo, Geosci. Model Dev., 11, 3945-3982,

This wiki contains information shared between NorESM developers and users

The purpose of the wiki is to provide a common place for NorESM users and developers to share information. What tools are you using? Which version should I run for what purpose? etc.

Any questions about the wiki content should be directed to

NEW The development version has been moved to git: Obtain a copy through

 git clone  

You first need to be registered as a noresm user on github (see detailed info in Obtain a copy of the model (using git))

To obtain the current official version (i.e an old version used in CMIP5) : svn checkout If you are not a registered user, contact to get the proper authorization.

The main trunk (stable development verison) is at the “master” branch on github (including CAM 5.3). (see detailed info in Obtain a copy of the model (using git))

If you are on a normal ubuntu PC and want the source code, you might see that “svn checkout” complains about “gnome keyring”. If you see this problem, the solution is here:

Need access to other versions: Special access document:

Most developers compile and run NorESM on hexagon ( That machine uses the portland group fortran compiler. Most developers develop the code on that machine using “develop/compile/run/analyze print statments” on that machine.

Some experiments have also been done with compiling running CAM on a normal Linux PC in order to use interactive debuggers. (see below)

Setting up CAM on your own linux PC

Any development should ideally be agreed with the NorESM development team and be properly described in the issue tracker, see the link below

Using the issue tracker

If you have changed the model and want to merge your changes to the trunk, your model has to pass some tests:

NEW: After switching to git (13th november 2015) the svn-repository is read-only. Some advice on how to use the new git-repository are available her: Obtain a copy of the model (using git)

Some guidelines for modifying NorESM’s subversion repository: SVN - Best Practice/FAQ

How-to for setting up svn repositories on NorStore: Subversion how-to for NorStore

You obtain the model code through checking it out. The command would be

git clone
git checkout -b aBranchName origin/aBranchName

This gives the code in your directory

Developing the model also involves setting some uncertain numbers into the model. Not all of these are available from namelists. Go to the link below to understand where main uncertainties are.

Uncertain parameters (which can be discussed) in the aerosol model

Long-term archiving is normally done on NorStore's disk resources (e.g, in /projects/NS2345K/noresm/cases).

To avoid loss of data, another copy should be placed on tape. For instructions, see Norstore Tape

Data that builds the basis of publications should be migrated to NorStore's Research Data Archive in order to guarantee preservation and also to offload the project area. For specific NorESM instructions, see Norstore Archive

Model output and derived data products can be shared via the Norwegian Earth System Grid data portal (see Simple online sharing for instructions).

Some aerosol and cloud-relevant output for the development version of NorESM2 is available for those with MET Norway affiliation through VpN at /vol/fou/emep/People/alfk/CAM-Oslo-diagnostics/

Several simulations have been performed with NorESM. A list of available simulations and runs can be found here. List of model runs by NorESM. The page also contains an overview of planned simulations. A fairly extensive description of the model and to some extent also the CMIP5 runs can be found at

Choose one of the links. Search for NorESM1-M CMIP5 in the search fields. Choose the link model documentation

NorESM is also used in several projects: Existing projects

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  • Last modified: 2022-05-31 09:29:32
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