Dear CICE community members,

You may have heard that the CICE sea ice model is undergoing some changes, both in the code itself and in the manner in which it is maintained and developed. A group of core developers have launched the CICE Consortium for this purpose, and we are in the process of getting CICE version 6 ready to release, along with its column physics as a separate package called Icepack. The new codes will be based on github.

In the meantime, the LANL server that hosts our current subversion repository is going away and will not be replaced. The CICE svn trunk and previous releases will be available in a public repository on github. We are archiving the entire CICE repository including all of the branches in a private repository (also on github), where some of us will be able to access it as needed. If there is anything you would like to check in or out of the svn repository, please do so within the next 2 weeks. If that is not possible, let me know and I'll try to work the issue. And please feel free to contact me with any questions.

Best wishes, Elizabeth


The Los Alamos sea ice model (CICE) is the result of an effort to develop a computationally efficient sea ice component for use in fully coupled, atmosphere-ice-ocean-land global circulation models, and it was originally developed to be compatible with the Parallel Ocean Program (POP). The current version of the model has been enhanced greatly through collaborations with members of the Community Climate System Model Polar Climate Working Group, based at the National Center for Atmospheric Research, and researchers at the U. K. Met Office Hadley Centre, the Centre for Polar Observation and Modelling, and the U. S. Naval Research Laboratory. We especially thank the DOE Regional Arctic System Model (RASM) effort for both funding and the dedication required to get CICE v5.1 running successfully in both RASM and CESM, along with the addition of many model enhancements.

NOAA has recently added an experimental sea ice forecasting tool, based on RASM:

A new sea ice modeling consortium for CICE

CICE’s community of stakeholders and primary developers has formed a new Sea Ice Modeling Consortium as a vehicle for collaboration and sharing, to maintain the current CICE model for existing and new users, to incorporate and maintain new research and development, and to accelerate scientific sea ice model development and its transfer into operational use.


Source code, documentation and data sets

The CICE code is freely available under a CopyRight agreement, including full documentation and basic forcing data for testing. CICE version 5.1 was publicly released in March, 2015. The main web page with documentation and downloads is here:


CICE Documentation and User's Guide (pdf)


Mailing List

If you would like announcements about releases and other CICE information, you can subscribe to the cice-users list. To subscribe, send an e-mail to listmanager@… (listmanager at with the message "subscribe cice-users". We will need to confirm your request before you are officially added.

Users and Collaborators

We have begun to compile a list of references to document the wide usage that CICE enjoys, and we appreciate your assistance in this effort: CiceUsers

CICE: the name

The Los Alamos developers pronounce the name as "sea ice," but there has been a small grass-roots movement underway to alter the model name's pronunciation to what an Italian might say, "chee-chay." Others choose to say "sice" (English, rhymes with "ice"), "seese" (French, like "cease") or "shii-aisu" (Japanese). However you pronounce it, it is CICE, the Los Alamos Sea Ice Model.

Update: The CICE Consortium voted that the name should be pronounced as "sice".

Last modified 8 months ago Last modified on 10/16/17 13:26:36

Attachments (1)

Download all attachments as: .zip