Opened 17 months ago

Last modified 17 months ago

#341 assigned

Snow buildup and water budget (JULES)

Reported by: Martin Dix Owned by: Martin Dix
Priority: critical Component: ACCESS-CM2
Keywords: Cc:

Description

Analysis from Arnold shows steady increase of snow in the al623 run and corresponding drop in sea-level.

Change History (2)

comment:1 Changed 17 months ago by Martin Dix

Owner: set to Martin Dix
Priority: majorcritical
Status: newassigned

comment:2 Changed 17 months ago by Martin Dix

In ACCESS1.0 and 1.3 snow amounts were capped with excess going to runoff and appearing as freshwater at continental edge via the river scheme. This was something we added. Both HadGEM2 and HadGEM3 had no limit on snow growth and added a separate freshwater flux to ocean as a proxy iceberg melt flux.

The GC3 documentation (https://code.metoffice.gov.uk/trac/gmed/wiki/GCDev/GCDocumentation/GC3CouplingChanges) says

Icebergs fed from land ice increases: Snow amounts on land ice gradually increase over time. In GC2.0 a blanket fresh water flux was applied to the extratropical oceans to balance this snow increase. In GC3.0 the snow amounts over land ice are passed though the coupler to NEMO's prognostic iceberg scheme and iceshelf melting scheme, maintaining water conservation.

Last edited 17 months ago by Martin Dix (previous) (diff)
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