Evaluation OM3: Drake Passage Transport

[ezhilsabareesh8]

Drake Passage Transport

Issue: ACCESS-Community-Hub/access-om3-paper-1#1
Notebook: https://github.com/ACCESS-Community-Hub/access-om3-paper-1/blob/19b11fedc1d459a886c15c5165375c4ff16b7179/notebooks/StraitTransports.ipynb

[chrisb13]

Drake passage transport in CM3.

Details:

• this commit b2a1cd9d7818659a99b3ada11c66cc5a11504b3e
• analysing this run /g/data/zv30/non-cmip/ACCESS-CM3/cm3-run-11-08-2025-25km-beta-om3-new-um-params/cm3-demo-datastore/cm3-demo-datastore.json
• using this notebook access-om3-paper-1/notebooks/DrakePassageTransport.ipynb (i.e. from OM3 repo using this branch cm3_evaluation)

From @aekiss post, here is the Drake Passage transport from the 25km IAF run /g/data/ol01/access-om3-output/access-om3-025/25km-iaf-test-for-AK-expt-7df5ef4c

(This CM3 analysis munging was completed by @ezhilsabareesh8, just sharing here to show example of following these guidelines)

[adele-morrison]

Ouch.

[wghuneke]

CM2 at 0.25° has a really large DP as well, going up from 180 Sv at 1° to 210 Sv at 0.25°.

Looks like the increase in going from OM2 -> OM3 (30 Sv) and increasing resolution in CM (30 Sv) add up almost linearly!

[chrisb13]

• this commit 6a0e91b8b286ed5d40445b7073e6a28443cd7a30

@ezhilsabareesh8, can you please check that the link and commit hash are correct above? (Just edit my post if wrong.) I ask, as the labels in the figure at the bottom are incorrect, so I think guessed incorrectly.

CM2 at 0.25° has a really large DP as well, going up from 180 Sv at 1° to 210 Sv at 0.25°.

@ezhilsabareesh8, so is the orange line in this top figure the 1°?

[ezhilsabareesh8]

Thanks @chrisb13 , I have updated the link and commit hash. I used cj877 dataset for CM2 comparison, which is a 0.25° run.

cj877 | {ACCESS-CM2} | {ACCESS-CM2 with COSIMA OM2 0.25 degree ocean configuration. Present day atmospheric forcing with 1985-2014 mean GHG, aerosol emissions etc.} | {ocean} | {1mon} | {tx_trans_int_z}

[chrisb13]

H'm okay, maybe @wghuneke was thinking of a different CM2 run?

[wghuneke]

I'm referring to numbers I get with a simulation which is a copy of cz789 and which has improved interpolation weights compared with cj877. I'm surprised to see such big differences in DP transport between the two. Probably worth checking both models using the same calculations. I can have a look at it but it won't happen this or next week.

The data for the CM2-025 simulation with updated interpolation weights is stored under the ESM WG project: \g\data\lg87\wgh581\cz861