Hi
The CDS offers two high-resolution land surface datasets for variables such as temperature and precipitation. If I need daily values, I could calculate these from ERA5-Land, or I could get them directly from the Agrometeorological Indicators (AgERA5). Both have the same resolution (0.1 degree) and both are based on ERA5.
What are the differences between the two, and is there any guidance on which dataset to use?
Many thanks!
Rutger
9 Comments
Michela Giusti
Hi,
here you cancheck the main differences between ERA5 and ERA5-Land:
https://confluence.ecmwf.int/x/fdJ0B
Regarding daily data please have a look at the following link:
https://confluence.ecmwf.int/x/BD6kDQ
Best
Michela
Rutger Dankers
Hi Michela
Thanks! But that link doesn't provide me with information on the differences between AgERA5 and ERA5-Land. Both provide data at high resolution. As a naïve user which one should I use? Some guidance on this would be helpful, and should probably be included on the main catalogue pages, and not hidden away in the documentation.
Thanks!
Rutger
Kevin Marsh
Hi Rutger,
ERA5-Land is a reanalysis dataset which provides output at 0.1 degree resolution (and is forced by ERA5 atmospheric parameters); AgERA5 uses the ERA5 dataset (0.25 degree resolution) which is interpolated to 0.1 degree resolution.
This page may help:
The family of ERA5 datasets
The user can then decide which dataset is most appropriate for their own particular needs.
Hope that helps,
Kevin
Rutger Dankers
Thanks Kevin!
Again, AgERA5 is not mentioned on the page that you linked. I fear that for many users it will not be clear whether (or when) the interpolated reanalysis would be preferable to the land surface component at similar resolution. I guess we'll need to do some evaluation first!
Thanks in any case
Rutger
Kevin Marsh
Hi Rutger; you are correct, the page I sent lists the original ERA5 family of datasets; as AgERA5 is a dataset based on ERA5 which is produced by a 3rd party so is not included on that page. It would be good to see the results of your evaluation!
Thanks,
Kevin
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Milana Vuckovic
Hi Rutger,
I have recently had the similar dilemma when I needed to recommend the dataset to a partner on the project I am working on. They were interested in daily data for the small area in Austria.
Besides of probable differences in accuracy, which I guess the analysis still needs to be done, there are a few technical and practical things to consider:
I hope this helps a little...
Regards,
Milana
Folmer Krikken
Hi All,
Just to revive an old thread, despite AgERA5 being on an 0.1 degree resolution, the data itself are still generally very coarse. This is an example for daily precip for the Netherlands on 2nd of Jan. 2005, but this is happening for the complete dataset. So if you really need the high resolution, use ERA5-land.
Cheers, Folmer
c3s435lot5 SIS Agro Support
Hi just to revive this old thread again, but some important differences between AgERA5 and ERA5-land were not mentioned:
Moreover, I see some comments regarding limitations on data downloads for AgERA5 which are not clear to me. But if you are interested in using AgERA5 you may want to give AgERA5tools a try: https://agera5tools.readthedocs.io AgERA5tools can do the downloading and sub-setting for you and has the capacity to serve time-series of AgERA5 data on an HTTP API.
Finally, it should be realized that the development of AgERA5 was already started when ERA5-land did not exist. Moreover, for a long time ERA5-Land had quite a long delay on real time (was 3 months, now about 5 days) while AgERA5 always had a delay similar to ERA5. Nevertheless, for developing an AgERA5 v2 it would be logical to take ERA5-Land as its base instead of ERA5.