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General: Baltic boundary conditions and inconsistencies in LBCs #3

Open mo-mattmartin opened 11 months ago

hadjt commented 9 months ago

image

jdha commented 9 months ago

FYI In AMM7 runs for the Recicle project (many moons ago) I applied a delta ssh across baltic-to-northern-boundary taken from an eORCA12 run. I think we (@hadjt) chatted about this type of solution at the time.

hadjt commented 9 months ago

FYI In AMM7 runs for the Recicle project (many moons ago) I applied a delta ssh across baltic-to-northern-boundary taken from an eORCA12 run. I think we (@hadjt) chatted about this type of solution at the time.

Hi jdha! took me a moment to realise it was you! yes, I think we did. I have also asked if the BALMFC of we could have some full model domain SSH fields from there to see what there gradient was. Richard Renshaw has tuned an offset of the NWS AMM7 reanalysis.

jpolton commented 6 months ago

AMM15_CO9P2 was developed with Baltic boundaries from 2004 - 2014 in order to make a comparison against CO7. These are IOW GETM derived data. These are described in https://github.com/JMMP-Group/CO_AMM15/wiki , which includes links to the Baltic data.

Experiments with the Baltic boundary are logged here: https://github.com/JMMP-Group/CO_AMM15/wiki/Co9-Trial-AMM15-Rose-suite-summary#P0.2

Sarah Wakelin and Ryan Patmore have been involved with running of AMM15_CO9P2. Sarah, in particular, has been working in this space for many years.

hadjt commented 6 months ago

A salinity comparison between the Met Office AMM models and Copernicus Marine BAL-MFC model showed large differences in the Skagerrak, with BAL-MFC being much fresher. It looked like the region was dominated by salty surface inflow in the MO models, and by fresher outflow in the BAL-MFC model.

We do not currently implement the SSH in the Baltic. BAL-MFC models the Baltic, and the southern North Sea, and so use LBCs from a single model. I suspect BAL-MFC may have a better SSH gradient between the North Sea and the Baltic Sea, and so a more realistic Baltic Outflow. This could impact the salinities within this region.

CO9p2 have an improved Baltic LBC, which includes a dynamic SSH LBC, with an tuned offset. This may improve the salinity in this region.

hadjt commented 6 months ago

AMM15_CO9P2 was developed with Baltic boundaries from 2004 - 2014 in order to make a comparison against CO7. These are IOW GETM derived data. These are described in https://github.com/JMMP-Group/CO_AMM15/wiki , which includes links to the Baltic data.

Experiments with the Baltic boundary are logged here: https://github.com/JMMP-Group/CO_AMM15/wiki/Co9-Trial-AMM15-Rose-suite-summary#P0.2

Sarah Wakelin and Ryan Patmore have been involved with running of AMM15_CO9P2. Sarah, in particular, has been working in this space for many years.

I think Segolene told me Ryan Patmore is running some AMM experiments using Atl and Bal LBCs both taken from GLOSEA6 - I wonder if we should explore using both LBCs from the ORCA model we use operationally.