CMIP workshop part 2

Presentation

Slides from the presentation can be downloaded here.

Practical part

Outline

• Recap of part 1

• Which type of data access makes sense for your data processing?

• CMOR post-processing and QA

Working with CMIP data - other ways of access than ESGF web portal

Server-side data storage

IS-ENES (ended in 2023 but great portal)

https://is.enes.org/

SMHI (Bolin Centre) data library

Available on Tetralith but requires permission

Large scale data download and synchronisation with ESGF

ESGpull

https://esgf.github.io/esgf-download/

Data format - CMOR and CMORisation

CMOR - Climate Model Output Rewriter

https://cmor.llnl.gov/

CMOR tables

https://github.com/PCMDI/cmip6-cmor-tables/tree/main

Conversion table from native model variable to CMOR format - NorESM example

https://github.com/NorESMhub/noresm2cmor/blob/master/namelists/CMIP6_NorESM2-LM/historical/template/var.nml

Exploring CMIP data

Your task

• Find monthly mean precipitation flux for SSP2-4.5 from NorESM2-LM

• How many members are there?

• What is the model resolution of the atmosphere component?

• Available variants?

• Available dataset version(s) for say r1i1p1f1?

• On which server are the data located? Are there any replicas anywhere?

• How many files are in r1i1p1f1?

• Download the r1i1p1f1 dataset

• Inspect metadata in one of the netCDF files with ncdump

• Look at the data with ncview

• Load data in jupyter notebook/python/other plotting tool and make plots (maps and timeseries)

Questions