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a core project of

Endorsed CMIP6 diagnostic Sea Ice Model Intercomparison Project (SIMIP)

1-AWI-2012Polarstern_ARKXXVII_SMenze013SIMIP is an endorsed diagnostic MIP for CMIP6 that defines a list of variables to understand the evolution of sea ice in any experiment using the sea ice model as part of CMIP6.

SIMIP Science

The work of SIMIP is broadly divided into two phases:

1. In the run-up to CMIP6, we have defined a list of sea-ice related variables to be stored from CMIP6 model simulations. These variables allow researchers to analyze the three budgets that govern the evolution of sea ice and its impact on the Earth’s climate system, namely conservation of heat, the momentum balance and tracer conservation. In addition, variables are included that allow for the high frequency analysis of the sea-ice state itself. This list is now part of the official CMIP6 data request.

2. Once CMIP6 model output becomes available, SIMIP coordinates some of its sea-ice related analysis through a number of dedicated sub-groups. These include :
- Sea-ice dynamics, in particular analysis of velocity fields, strain variance and maximum shear strength (Bruno Tremblay)
- Spatio-temporal characteristics of sea ice (Ed Blanchard and Alex Jahn).
- Sea ice advance and retreat (Julienne Stroeve and Julienne Stroeve).
- Radiative feedbacks (Cecilia Bitz and Kyle Armour)
- Non-radiative feedbacks (François Massonnet and Martin Vancoppenolle)  .
- Assess sea ice simulations and observations using machine learning techniques (Neven S. Fuckar)
- Establish best practices for regridding sea ice model output (Nikolay Koldunov & Daniel Senftleben)
- Surface energy balance: (Ed Blockley)
- Snow on sea ice: (Alek Petty)
- Quantifying influence of sea ice internal variability in CMIP5 models (Dirk Olonscheck)
- Use large ensembles to quantify the limitations and opportunities of using short observational sea ice timeseries (Alexandra Jahn)
- Develop sea ice emulators (Abigail Ahlert  & Clara Burgard)
- Develop a long time-series sea ice reanalysis dataset (Axel Schweiger)

If you are interested in joining any of these projects, please get in touch with the leaders of the sub groups as indicated in the brackets.

Observation for sea ice model evaluation

SIMIP also works towards a common standard for sea-ice model evaluation. For the time being, we refer to the following to data sources:

• The National Snow and Ice Data Center (NSIDC) maintains a list of sea-ice related observational records that can be used to analyse the performance of sea-ice model simulations: http://nsidc.org/data/sipn/data-sets.html
• The NCAR ClimateDataGuide also features some sea ice products (in particular sea ice concentrations), with expert guidance on their properties for some of these data records: https://climatedataguide.ucar.edu/

SIMIP Workshops

Information on previous SIMIP workshops can be found here.

SIMIP Mailing List

To subscribe to the SIMIP mailing list, please send an email to the CliC Office (info[at]climate-cryosphere.org).

SIMIP Leadership

SIMIP co-chairs: Dirk Notz (MPI Hamburg) and Alexandra Jahn (University of Colorado at Boulder )
SIMIP SSG: Marika Holland, Elizabeth Hunke,  François Massonnet, Julienne Stroeve, Bruno Tremblay, Martin Vancoppenolle