Definition: Emissions|Kyoto Gases - which GWP version?

[jkikstra]

Currently, the template is as follows:

variable	description	unit
Emissions|Kyoto Gases	Emissions of Kyoto GHG emissions, including fossil CO2, CH4, N2O and F-gases	Mt CO2-equiv/yr

Unfortunately, "Mt CO2-equiv/yr" is poorly defined.
To get to this, you need to make define how you translate other gases into CO2 equivalent values.
Modelling teams may very well use different versions. Generally, most in the IAM community use GWP100, but there are multiple versions.

In previous templates, often the IPCC 4th assessment report GWP100 values were suggested to use as a default, I think to align with certain reporting templates.

It needs to be decided what is to be used.

Would it again be AR4GWP100? Or is it better to go with the newer AR6GWP100 value set? And how can we ensure this to be forward-compatible? Should there be info in the variable, or unit column about what GWP set is used?

[danielhuppmann]

Good question - any thoughts @IAMconsortium/common-definitions-emissions?