ACCESS-CM2/AM2 can be nudged with reanalysis meteorology (e.g. ERA5). Constraining the meteorology is useful in several applications (e.g. comparing model to composition measurements, sensitivity tests etc).
There are a few steps to make this more widely available.
- write-up instructions to add nudging to CM2 [Matt W]
- update CM2 release package nudging code with some minor changes (back-ported from later release) [Atmos team? Releases team?]
- retrieve, process and store ERA5 data. Likely requires approval of SAC, due to scale of storage required.
I’m happy to co-ordinate this request. We will need to estimate the storage required as part of this request, and what levels / resolution can be made available.
Are there any other potential users of this data and/or nudging? It would be good to know how wide the audience is for this feature. Anyone interested please reply and follow this topic!
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For nudging - my initial numbers are:
12.6G/month for the initial download.
We convert to N48 at 3hrs, which results in 96M per day…
I have a script which @Fraser gave me that downloads the ERA5 stuff and another to do the conversion. So a lot of the ‘work’ is already done - just needs a home and maintenance.
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Now marked with ‘help’ tag
Re: step 2 of first post
Can I request that the dev branch:
main/branches/dev/mohitdalvi/vn10.6_nudge_with_era_plev@69770
is merged into the CM2 package branch:
main/branches/pkg/Rel/vn10.6_access_cm2
The dev branch adds missing functionality to convert from ECMWF pressure levels to UM model levels as part of the nudging process. Including this branch will simplify the instructions to add nudging.
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Draft instructions for adding ERA-I nudging. The data for this is already available for the full ERA-I time period.
ERAI_nudging.pdf (131.4 KB)
Anyone willing to test in AM2/CM2?!
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