ISIMIP2a


This simulation protocol contains all information necessary to run climate-impacts simulations consistent with other models participating in the ISIMIP2a simulation round. The protocol is divided into 15 chapters: chapters 1-5 contain important information for modellers in all sectors. Chapters 6-14 provide sector-specific instructions (can be downloaded separately below, including the references) and chapter 15 contains the references. For any queries, get in touch.

The latest version of this protocol was released on Feb. 28, 2020 and is known as the ISIMIP2a-extended protocol.

The ISIMIP2a-extended protocol is very similar to the ISIMIP3a protocol, circulated on Feb. 21, 2020, and we suggest to prioritize simulations for ISIMIP3a and 3b over ISIMIP2a-extended. However, we still encourage all impact modeling teams to consider performing simulations according to this ISIMIP2a-extended protocol – even if you have already contributed simulations to the original ISIMIP2a round. These simulations will enhance the basis for evaluating the models that were used for the future projection runs in ISIMIP2b, which have been widely used and will continue to be of great value.

  • Further information on differences between the 2a and the 2a-extended protocols, as well as reasons for running the ISIMIP2a-extended simulations, can be found here.

Important information about preparing your simulation files

ISIMIP2a Protocol Changes

March 3, 2020

We are happy to announce the release of the ISIMIP2a-extended simulation protocol. This protocol is very similar to the ISIMIP3a protocol which we suggest to prioritize. However, we still encourage all impact modeling teams to consider performing simulations according to this ISIMIP2a-extended protocol – even if you have already contributed simu ...

Oct. 28, 2019

The correct renaming is "varsoc" instead of "man", and "nosoc" instead of "nat".Erratum for: '"man" and "nat" scenarios for forest sectors renamed to nosoc and varsoc'

March 5, 2018

To maintain consistency with other sectors, the "man" and "nat" scenarios for forest sectors have been renamed to "nosoc" and "varsoc" respectively.Erratum in https://www.isimip.org/protocol/protocol-changes/erratum-man-and-nat-scenarios-forest-sectors-renamed-nosoc-and-varsoc/

March 5, 2018

The file-naming conventions for output file has been updated to include a tag to indicate the target climate data set for the bias correction. The standard file name now has the form: <modelname>_<obs>_<bias-correction><clim_scenario>­_<socio-econ-scenario>_<sens-scenarios>_<variable>_<region>_ ...

June 13, 2017

References for the four observational climate data sets for ISIMIP2a have been added to table 3.