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add diagnostic for the "actual" sea ice increment #1402

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shlyaeva opened this issue Dec 5, 2024 · 5 comments
Open

add diagnostic for the "actual" sea ice increment #1402

shlyaeva opened this issue Dec 5, 2024 · 5 comments
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@shlyaeva
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shlyaeva commented Dec 5, 2024

Add a capability to compare "soca" increment generated by var with "soca"-type increment (i.e. full ice concentration) that was actually added to the CICE restarts. It would be useful for testing and diagnostics.

@shlyaeva shlyaeva added the soca label Dec 5, 2024
@shlyaeva shlyaeva self-assigned this Dec 5, 2024
@shlyaeva
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Computing just the increments is non-trivial because:

  • soca analysis is at the middle of the window, and so soca analysis increment is with respect to the background in the middle of the window
  • when we run soca2cice, we use background (restart file) at the beginning of the window, and update it to be as close as possible to the soca analysis (at the middle of the window). The increment computed there would then include changes from both the analysis and the 3hr forecast.

So, to compute the increment, we'd need to compute diff between soca2cice output analysis file and the middle-of-the-window background.
Notes on possible implementation:

@shlyaeva
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Note: for experiments that ran before and didn't copy soca2cice analyses, it may be worth adding a script that can subtract the background from the total ice concentration from cice analysis restarts.

@shlyaeva
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shlyaeva commented Jan 7, 2025

Development in:

I'll wait till soca PR is merged, and gdasapp tags are updated to include it before opening the PRs in the noaa-emc repos.

@RussTreadon-NOAA
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RussTreadon-NOAA commented Jan 8, 2025

@shlyaeva and @guillaumevernieres :
The sorc/soca hash in GDASApp branch feature/stable-nightly has been updated to soca @ f60b0e2. GDASApp g-w based ctests passed. Thus, the changes associated with soca PR #1114 exist and are functional in a GDASApp branch.

We can open a PR to merge feature/stable-nightly into GDASApp. This will bring the updated soca hash into GDASApp develop.

@shlyaeva
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shlyaeva commented Jan 8, 2025

@RussTreadon-NOAA perfect, thank you for the heads up! merging feature/stable-nightly would be great; let me know if you'd like me to open the PR.

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