# Coupling two hemispheric SI³ with ocean via OASIS

**URL:** <https://nemo-ocean.discourse.group/t/coupling-two-hemispheric-si-with-ocean-via-oasis/247>\
**Category:** Global\
**Tags:** orca, R2, SAS, OASIS, SI3\
**Created:** [25 March 2022 10:45 UTC](https://nemo-ocean.discourse.group/t/coupling-two-hemispheric-si-with-ocean-via-oasis/247 "2022-03-25T10:45:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![emalod](https://avatars.discourse-cdn.com/v4/letter/e/898d66/32.png) [@emalod](https://nemo-ocean.discourse.group/u/emalod)\
**Post date:** [25 March 2022 10:45 UTC](https://nemo-ocean.discourse.group/t/coupling-two-hemispheric-si-with-ocean-via-oasis/247/1 "2022-03-25T10:45:42Z")

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The NEMO-SI³ configuration can already be split into two separated executables and coupled via OASIS. The resulting modularity helps to enhance computing performance.  
In this new configuration, SI³ - in Stand Alone Surface module configuration - is split again into two independent models discretised on hemispheric grids. Details can be found here :

- _Maisonnave, E., & Bourdallé-Badie, R., 2022: Coupling NEMO global ocean with hemispheric Arctic and Antarctic ice models, Technical Report, **TR/CMGC/22/18** , CECI, UMR CERFACS/CNRS No5318, France_

> **[support\_esiwace\_TR\_CMGC\_22\_18.pdf](https://cerfacs.fr/wp-content/uploads/2022/03/support_esiwace_TR_CMGC_22_18.pdf)**
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> 343.76 KB

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**Author:** ![smasson](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@smasson](https://nemo-ocean.discourse.group/u/smasson)\
**Post date:** [25 March 2022 10:59 UTC](https://nemo-ocean.discourse.group/t/coupling-two-hemispheric-si-with-ocean-via-oasis/247/2 "2022-03-25T10:59:29Z")

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It is such a great idea to use the coupling to avoid the North Pole folding in sea-ice. So obvious… why we did not do it much earlier?  
“twicefaster and two times cheaper than its single executable counterpart.” no need to say more… 😀