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CMIP Phase 6 (CMIP6)

Overview CMIP6 Design and Organization


The overview paper on the CMIP6 experimental design and organization has now been published in GMDD (Eyring et al., 2015). This CMIP6 overview paper presents the background and rationale for the new structure of CMIP, provides a detailed description of the DECK and the CMIP6 Historical Simulation, and includes a brief introduction to the 21 CMIP6-Endorsed MIPs.

The discussion paper is under review for the journal Geoscientific Model Development (GMD) until 08 Feb 2016. We have discussed this design extensively with the community already, but if you have remaining additional comments, please feel free to submit them through the open discussion forum.

A brief summary can be found in the following overview presentation (CMIP6FinalDesign_GMDD_151215.pdf) and below. 

After a long and wide community consultation, a new and more federated structure has been put in place for CMIP. It consists of three major elements:

  1. a handful of common experiments, the DECK (Diagnostic, Evaluation and Characterization of Klima experiments) and the CMIP Historical Simulation (1850 – near-present) that will maintain continuity and help document basic characteristics of models across different phases of CMIP;
  2. common standards, coordination, infrastructure and documentation that will facilitate the distribution of model outputs and the characterization of the model ensemble; and
  3. an ensemble of CMIP-Endorsed Model Intercomparison Projects (MIPs) that will be specific to a particular phase of CMIP (now CMIP6) and that will build on the DECK and the CMIP Historical Simulation to address a large range of specific questions and fill the scientific gaps of the previous CMIP phases.

 

References:

 

CMIP6 Special Issue

A CMIP6 Special Issue will be published in GMD (see here). This special issue describes the new design and organization of CMIP and the suite of experiments of its next phase (i.e., CMIP6) in a series of invited contributions. The description of the experiments and forcing data sets define CMIP6 in detail. The papers provide the required information to produce a consistent set of climate model simulations that can be scientifically exploited to address the three broad scientific questions of CMIP6: (1) How does the Earth system respond to forcing?, (2) What are the origins and consequences of systematic model biases?, and (3) How can we assess future climate changes given climate variability, predictability and uncertainties in scenarios? The special issue will include an overview paper on the CMIP6 design and organization, contributions from CMIP6-endorsed MIPs and descriptions of the forcing data sets. 

 

CMIP6 Data Request

The CMIP6 Data Request is coordinated by the WGCM Infrastructure Panel

 
CMIP6 Forcing Datasets

The CMIP6 forcing datasets have been reviewed by the CMIP6 modelling groups and CMIP6-Endorsed MIPs and will be made centrally available. Preindustrial and historical forcings for the CMIP DECK experiments and the CMIP6 historical simulations will be made available at PCMDI and through the ESGF soon. All forcing data (land use, emissions, extensions) required for the future SSP-RCPs selected in ScenarioMIP will be made publicly accessible at the SSP database. These datasets will be made available by end of 2016. Information how to access the forcing datasets will be made available on the CMIP Panel website. All forcing datasets will be described in the CMIP6 Special Issue.

  • Historical SLCF and GHG Emissions – Contacts: Steve Smith ( This email address is being protected from spambots. You need JavaScript enabled to view it. ) and Bob Andres ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • Initial Description: Date 19 February 2015 (for the initial description, click here)
    • Data Description: Date 5 February 2016 (for a short data description, click here. A sample gridded dataset for year 2000 intended for model input set-up, including SO2, NOx, CO, NMVOC, NH3, BC, and OC is available at this link. This package contains sample netCDF files for the year 2000. These data are not final, but can be used to set-up read-in routines, review, and testing ). Modelers who would additionally like a sample year for speciated VOCs should contact Steve Smith. Feedback on these test data is requested by end of February.
  • Global Gridded Land-use Forcing Datasets – Contact: George Hurtt ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • Initial Description: Date 31 January 2015 (for the initial description, click here)
    • 12 November 2015: DRAFT land-Use Harmonization dataset (LUH2-v0.3) is available, and intended for model I/0 and testing (https://cmip.ucar.edu/lumip)
    • 29 March 2016: A beta release of the historical land-use forcing dataset (LUH2 v1.0h_beta) is now available, covering the period 850-2015. LUH2 v1.0h_beta is a prototype, intended for model testing and development only. The emphasis in this version is on the format of the intended data products; data values are close to final but will likely change in the finished product, and are not intended nor suitable for publication quality work. A README file describing the dataset, and how to download it, is available here. This information is also available from the LUMIP website (https://cmip.ucar.edu/lumip). Please test this dataset and send any feedback you might have to George Hurtt (email: This email address is being protected from spambots. You need JavaScript enabled to view it. ), L. Chini ( This email address is being protected from spambots. You need JavaScript enabled to view it. ), and S. Frolking ( This email address is being protected from spambots. You need JavaScript enabled to view it. ).
  • Historical GHG concentrations – Contact: Malte Meinshausen ( This email address is being protected from spambots. You need JavaScript enabled to view it. ) and Alexander Nauels ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • Initial Description: Date 17 February2015 (for the initial description, click here)
    • 19 February 2016: The first bit of a test dataset for historical GHG concentrations, namely for CO2, CH4, and N2O, is now available for download from the following website http://www.climate-energy-college.net/cmip6-data. This dataset is preliminary and released for data checking and verification purposes. Please provide feedback to Malte Meinshausen by early March (4 March).
  • Ozone Concentrations and Nitrogen (N)-Deposition – Contact: Michaela Hegglin ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
  • Aerosol Optical Properties and Relative Change in Cloud Droplet Number Concentration – Contact:, Bjorn Stevens ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • Initial Description: Date 11 February 2015 (for the initial description, click here). This description is outdated. To provide a more consistent representation of aerosol forcing for simulations with prescribed aerosols, the officially recommended CMIP6 aerosol forcing dataset is the simple plume aerosol climatology described below. This is a new approach where aerosols are prescribed in terms of optical properties and relative change in cloud droplet number concentration. Aerosol concentrations (mass and number) will not be provided in addition.
    • 7 December 2015: A link to the beta release of the simple plume aerosol climatology can be found here: https://powerfolder.gwdg.de/dl/fi74MC1NbN9WYGsf63937q2R/MACv2-SP_v1-beta.tgz. The README file is available here.
  • Solar forcing – Contacts: Katja Matthes ( This email address is being protected from spambots. You need JavaScript enabled to view it. ) and Bernd Funke ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • Initial Description: Date 13 February 2015 (for the initial description, click here)
    • 2 February 2016: The beta release of the solar forcing dataset (including a meta data description and a routine to read the data) for CMIP6 can be found at the SOLARIS-HEPPA website at http://solarisheppa.geomar.de/cmip6.
  • Stratospheric Aerosol Data Set – Contacts: Beiping Luo ( This email address is being protected from spambots. You need JavaScript enabled to view it. ), Thomas Peter ( This email address is being protected from spambots. You need JavaScript enabled to view it. ) and Larry Thomason ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • Initial Description: Date 31 January 2015 (for the initial description, click here)
    • 3 March 2016: A beta release of stratospheric aerosol data for use in CMIP6 models intended for model testing and development only is now available at ftp://iacftp.ethz.ch/pub_read/luo/CMIP6/. Corresponding plots, a data description and a read routine (3l_read.f) is also available in that folder. Please provide feedback to Beiping Luo by 20 March 2016.
  • AMIP Sea Surface Temperature and Sea Ice Datasets – Contact: PCMDI ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
  • Future Emissions – Contact: Detlef van Vuuren ( This email address is being protected from spambots. You need JavaScript enabled to view it. ) and Brian O’Neill ( This email address is being protected from spambots. You need JavaScript enabled to view it. )
    • For information on the future scenarios that will be run by global climate models within CMIP6, see the ScenarioMIP website at http://cmip.ucar.edu/scenario-mip. More information on the Shared Socioeconomic Pathways (SSPs) can be found at the SSP Database at https://tntcat.iiasa.ac.at/SspDb/dsd?Action=htmlpage&page=about.
    • All forcing data (land use, emissions, extensions) required for the future SSP-RCPs selected in ScenarioMIP will be made publicly accessible at the SSP database.

 

 

Applications for CMIP6 Endorsed MIPs

See http://www.wcrp-climate.org/modelling-wgcm-mip-catalogue/modelling-wgcm-cmip6-endorsed-mips

 

CMIP5 survey
  • CMIP5 Survey - sent out to representatives of the climate community end of June 2013
  • Synthesis of CMIP5 Survey (August 2013) (Presentation by Veronika Eyring and Ron Stouffer at the Workshop ‘Next Generation Climate Change Experiments Needed to Advance Knowledge and for Assessment of CMIP6’, 5 August 2013, Aspen, CO, USA)
  • Synthesis of CMIP5 Survey (October 2013) (Presentation by Veronika Eyring and Ron Stouffer at the WGCM 17th Session, 1-3 October 2013, Victoria, Canada)
 
Previous iterations on the CMIP6 Design

The CMIP6 design and organization was finalized at the WGCM 18th Session that was held 8-10 October 2014 in Grainau/Garmisch-Partenkirchen (Germany).

A brief summary can be found in the following overview presentation (CMIP6FinalDesign_WGCMMeeting_150116_Sent.pdf) and below. The final CMIP6 Design, possibly with small modifications to the here presented figures and wording, will be published in a GMD Special Issue together with a description of the CMIP6-Endorsed MIPs and the forcing datasets. This Special Issue will open  30 April 2015.
 
The DECK which will serve as an entry card for CMIP will consist of the following four simulations: (a) AMIP simulation (~1979-2014); (b) Pre-industrial control simulation; (c) 1%/yr CO2 increase, and (d) Abrupt 4xCO2 run. In addition, the CMIP6 Historical Simulation has been added which will serve as the entry card for CMIP6 and as a benchmark for CMIP6-Endorsed MIPs. The historical simulation (1850-2014) will use the specific forcings consistent with CMIP6 which will be finalized on the timescales laid out in slide 10. The CMIP6 Historical Simulation has been introduced in addition to the DECK to better separate CMIP from a specific Phase of CMIP (see slide 4 for illustration and slide 5 for the main criteria for DECK and Historical Phase X). Both DECK and the CMIP6 Historical Simulation should be run for each model configuration used in the subsequent CMIP6-Endorsed MIPs. Future climate change scenarios will be run as part of ScenarioMIP with a Tier 1 that includes three different scenarios, spanning different possible futures.
 
The criteria for MIP endorsement have been streamlined and agreed at the WGCM 18th session. They now comprise a single set covering MIPs and their experiments. A timeline towards MIP endorsement and beyond has been agreed. Input to the data request will be coordinated by the WGCM Infrastructure Panel.

 
Old versions of slides