Simulation Protocols


The ISIMIP2b scenarios are designed to elicit the contribution of climate change to impacts arising from low-emissions climate-change scenarios. Pre-industrial control runs are included to facilitate statistical comparison with a no-climate-change case.

The scientific rationale for the scenario design has been document in the GMD discussions paper "Assessing the impacts of 1.5°C global warming – simulation protocol of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP2b)" by Frieler, et al.

The input data for ISIMIP2b are now available! Find all the information about downloading the data here and information about which input data are available can be found here.

Please read the data and co-authorship policy and register your model for ISIMIP2b here.

Below you will always find the latest version of the simulation protocol. Changes compared to previous versions will be recorded in the change log.

Important information about preparing your simulation files for ISIMIP2b

ISIMIP2b Protocol Changes

Jan. 30, 2017

A new file identifier <co2_scenario> has been added. This identifier should be set to co2 unless the experiment specifically requires the identifier 2005co2 (in this case that CO2 levels are kept constant at 2005 levels.A table of possible file identifier has been added to the end of section 3 of the protocol.

Jan. 30, 2017

Changes have been made to the health (temperature-related mortality) scenario table to reflect latest developments.

Jan. 30, 2017

The description of the future water abstraction for industrial and domestic uses data has been updated and now reads: "For modelling groups that do not have their own representation, we provide files containing the multi-model mean (from WaterGAP, PCR-GLOBWB and H08) for domestic and industrial uses under SSP2 from the Water Futures and Solution..

Jan. 30, 2017

A table of preferred regions has been added to the information for all sectors. However, regional results are welcomed for all world regions, so long as they follow the ISIMIP2b protocol.


The simulation protocol contains all information necessary to run climate-impacts simulations consistent with other models participating in the current ISIMIP simulation round, ISIMIP2a. Here you will find the protocol for ISIMIP2a. Click on the link below for information about the ISIMIP Fast Track.

Information about uploading simulation data to the DKRZ server.

The protocol is divided into 7 chapters: chapters 1-6 contain important information for modellers in all sectors. Chapter 7 provides sector-specific instructions (can be downloaded separately below).  For any queries, get in touch.

See the table below for an up-to-date list of protocol changes.

ISIMIP2a Protocol Changes

Jan. 12, 2017

The historical CO2 concentrations are also provided in the input data archive (historical_CO2_annual.txt) and are based on time series of global atmospheric CO2 concentrations from Meinshausen, Raper, & Wigley (2011) for 1765-2005 and Dlugokencky & Tan (2014) from 2006-2013.

Jan. 12, 2017

The <variable> identifier in the file name of your output data can also be used for information about the plant functional type (pft) in the biomes and permafrost sectors. The pft/species naming is model-specific and hence has to be reported in the impact-model database (see .

Nov. 30, 2016

The entire ISIMIP2a protocol has now been streamlined to only include vital information pertaining to the simulation design. For technical reasons, the sector-specific protocol information have now been placed in individual chapters.

Nov. 30, 2016

Managerment and regeneration rules have been updated for the forest sector.

ISIMIP Fast Track

See here for more information about the ISIMIP Fast Track, including the simulation protocol.