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- If you want to download data online directly from the web site you will see a button "Accept License" or similar to accept the license at the end of the field selection page. Just click on it.
- If you want to download data with a Python script - see below, the easiest way I found to accept the license is by starting(!) to download any field from the online web page. For example, from the following page:
https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=download
Log in , select any field, year, month, day, hour then and scroll down to the end of the page. There, under "Terms of use" you should see a red button saying "Accept License" or similar. Just click on it. That's all. No need to submit the request! Then downloading data with Python should work.
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| module load python3/miniconda312 source activate cdsapi |
Download data with Python
To download data from ECMWF with Python you have to write a Python script with a specific format. Have a look at point "3. Use the CDS API client for data access" of the following page for guidance:
https://cds.climate.copernicus.eu/how-to-api
Another way to find out what to put in the script is to go on the web site, for example:
https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=download
Select everything or an example of what you would like to download, scroll to the end of the page and click on "Show API request code". You can just copy paste the code you will see into your script and modify it to your liking.
Remember to load the Python environment above before executing your Python script!
Number of items limit
Note there is a limit for the number of "items" you can download in one request. According to Anabelle from the Copernicus User Support team:
"This limit varies from dataset to dataset, as it depends on the granularity of the data served. For ERA5, 1 'item' corresponds to 1 variable on a (2D) field at 1 level at 1 timestep. Any request submitted to the CDS which is larger than the limit for that dataset will be rejected by the system, so you will need to modify you selection until it is smaller than the limit. If you go to the 'Download data' tab for a given dataset (e.g. ERA5), you can build a request interactively and you will get a warning if it exceeds the limit. Please note that these limits can change over time in order to balance the load on the system."
If your request gets too large you will have to split it up into multiple requests.