Atmos-only UKESM ocean ancils

[ChrisWells]

Hi,

I'm trying to run atmos-only UKESM, to match a coupled run I've done, to do ERF calculations. So I need to run the model with prescribed SSTs and sea ice (and anything else which is needed), output from my coupled simulations.

I copied suite u-be303 at 116849 (is this the right suite for me to use?), and am looking to see where to change SSTs. I can see in rose-app.conf it refers to 2 files (sst and sea ice) in /projects/ancils/cmip6/ancils/n96e/timeseries_1870-2016/SstSeaIce . These files are anc files which I don't know how to read, and I need to use output from a coupled UKESM run instead. So my issues are:

-is that AMIP UKESM suite the right one to use?

-are these files the relevant ones, or does the model take the ocean from somewhere else/also?

-how can I replace the ocean files with output from one of my coupled UKESM runs? Do I use the ida.file and oda.files?

Many thanks for help with this.

Cheers,
Chris

[willie]

Hi Chris,

Further information on the UKESM model can be found at http://cms.ncas.ac.uk/wiki/UM/Configurations/UKESM. See especially the release notes http://cms.ncas.ac.uk/wiki/UM/Configurations/UKESM/RelNotes1.0.

Willie

[ChrisWells]

Hi Willie,

Thanks for the links. I'm still seeking to use the suite with an ocean derived from output from a coupled run, to diagnose ERF accurately. Maybe the AMIP suite isn't the appropriate one for me?

Cheers,
Chris

[grenville]

Chris

I have forwarded your question to the UKESM team - we're not in a position to decide what configuration you should run.

In any case, you will need to create SST and sea ice ancillary files from the coupled model output (presumably.) There are tools to help do that - take a look at http://cms.ncas.ac.uk/documents/xancil/.

Grenville

[yongming]

Replying to ChrisWells:

Hi,

I'm trying to run atmos-only UKESM, to match a coupled run I've done, to do ERF calculations. So I need to run the model with prescribed SSTs and sea ice (and anything else which is needed), output from my coupled simulations.

I copied suite u-be303 at 116849 (is this the right suite for me to use?), and am looking to see where to change SSTs. I can see in rose-app.conf it refers to 2 files (sst and sea ice) in /projects/ancils/cmip6/ancils/n96e/timeseries_1870-2016/SstSeaIce . These files are anc files which I don't know how to read, and I need to use output from a coupled UKESM run instead. So my issues are:

-is that AMIP UKESM suite the right one to use?

Yes, u-be303 is the released UKESM1-AMIP.

-are these files the relevant ones, or does the model take the ocean from somewhere else/also?

Yes, /projects/ancils/cmip6/ancils/n96e/timeseries_1870-2016/SstSeaIce is the right file.

-how can I replace the ocean files with output from one of my coupled UKESM runs? Do I use the ida.file and oda.files?

As Grenville's reply.
The um support team should be able to help as this is not UKESM specific.

Many thanks for help with this.

Cheers,
Chris

[ChrisWells]

Hi Grenville, Yongming,

Many thanks both for your help. I'll have a go at using the xancil tool to create new anc files for my run - I'll close this suite now.

Cheers,
Chris