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ICON-eCLM: exchange-coefficient coupling scheme - #154

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s-poll merged 2 commits into
masterfrom
exchcoef-1-scheme
Oct 26, 2026
Merged

s-poll merged 2 commits into
masterfrom
exchcoef-1-scheme

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@s-poll

@s-poll s-poll commented Oct 24, 2026 •

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Summary

Adds an optional ICON-eCLM coupling scheme in which eCLM sends surface exchange coefficients and surface humidity instead of the turbulent fluxes. This allows ICON to compute the fluxes implicitly. Off by default.

Changes

  • add global variable q_sf_grc and q_sf_patch
  • add ram1,rah1 and raw1 as global variables
  • introduce namelist parameter use_exchcoef_oascoupling
  • introduce exchange coefficient approach coupling
  • add coupling in lake landunit
  • fix namelist parameter use_exchcoef_oascoupling
  • use effective moisture resistance for raw1 at BareGroundFluxesMod.F90
  • combine parallel resistances by area-weighting their conductances
  • guard the gridcell resistance inversion against spval and unset patches

Stacked PR 1 of 4

- add global variable q_sf_grc and q_sf_patch
- add ram1,rah1 and raw1 as global variables
- introduce namelist parameter use_exchcoef_oascoupling
- introduce exchange coefficient approach coupling
- add coupling in lake landunit
- fix namelist parameter use_exchcoef_oascoupling
- use effective moisture resistance for raw1 at BareGroundFluxesMod.F90
- combine parallel resistances by area-weighting their conductances
- guard the gridcell resistance inversion against spval and unset patches
@s-poll
s-poll requested a review from kvrigor October 24, 2026 11:02
@s-poll

s-poll commented Oct 24, 2026 •

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The pip fail is because the cloning of OASIS is failing. https://icg4geo.icg.kfa-juelich.de is currently not available from "outside" FZJ. As this has nothing to do with this PR, I would nevertheless ask for a review.

@kvrigor

kvrigor commented Oct 26, 2026

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The pip fail is because the cloning of OASIS is failing. https://icg4geo.icg.kfa-juelich.de is currently not available from "outside" FZJ. As this has nothing to do with this PR, I would nevertheless ask for a review.

Being fixed in #159. I suspect the IBG-3 admin has blocked github.com as it generates huge network traffic. I'll try to relocate the OASIS3-MCT repo to our JSC Gitlab server

@s-poll
s-poll merged commit 2da405a into master Oct 26, 2026
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2 participants