Basic Questions

[seyedmohammad19]

1-Which model of cmip6 series does ESMvalTool have or use by default?

2-Does this software accept the simple output of cmip6 climate models as input? Or does it have special conditions?I mean how the data is entered into the software?

3-What method does ESMvaltool use for evaluation? On what basis does ESMvalTool say that the performance of this model is better than another model? What indicators does it use?

[zklaus]

Welcome, @seyedmohammad19!

1. ESMValTool supports all CMIP6 models and quite a bit of other data, see Obtaining Input Data in the documentation. There is no default per se, but individual recipes may use different defaults.
2. The data standard we work with for CMIP6 is the data as published on ESGF. If you are using a climate oriented super computer that is shared with others, chances are your local admins have already downloaded an archive of usable data. If you are only using your own computer, you can make use of ESMValTool's download feature to acquire the data automatically.
3. ESMValTool is a framework that contains a wealth of individual analysis contributed by many scientists. To get an overview, refer to the list of recipes in the documentation or have a look at the overview of the latest generation of results here. The closest to relative performance assessment of models is perhaps in the recipes in the section Climate Metrics.

If you want to get started using ESMValTool yourself, the best place to start is perhaps our online tutorial.

[seyedmohammad19]

Thanks a lot Mr Zimmemann :)

[zklaus]

You are welcome! If this answers your question, feel free to "Mark as answer" by clicking on the so-labeled button at the bottom of my answer.

[seyedmohammad19]

But your answer to the third question confused me a little.

Do you mean that, I choose the indicator (analysis) for evaluating models?

[zklaus]

Exactly. When you run ESMValTool, you choose which recipe to run. Have a look at the Running section of the documentation or try following the online tutorial already linked above.

[seyedmohammad19]

thank u

[seyedmohammad19]

Hi @zklaus
i have a question
i wanna download evspsblpot( potential evapotranspiration ) from ESGF for 3 models

should i download all variant_label that are same for 3 models? or is one enough (like r1i1p1f2)?

[zklaus]

That's really up to you. The variant_label indicates different model runs, so if you want to have an ensemble for improved statistics or to investigate internal variability, then it's helpful to download more than one ensemble member per model. If you are interested to play around a little bit or to get a quick first comparison between different models, then a single member may be enough.

[seyedmohammad19]

thank you very much