Change default sea ice melt pond scheme to sea level melt ponds - #8286
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darincomeau
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MPAS-seaice
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A pair of 30 year B-cases ( Sea level melt ponds: https://web.lcrc.anl.gov/public/e3sm/diagnostic_output/ac.dcomeau/E3SMv3_dev/20260312.V3.LR.WCYCL1850.icepack-sealevelponds-v1.5.3.chrysalis/mpas_analysis/ts_0001-0030_climo_0021-0030/ Annual melt pond fraction Arctic winter concentration Arctic winter thickness |
proteanplanet
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proteanplanet
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Given the stability of this new and more physical sea level pond option, and that the results indicate total sea ice volume don't change too much in fully coupled simulations, it makes sense for this to now be the default scheme for v3.2 to start building "flight hours" for this ahead of v4. We may wish to experiment as part of v4 developments with the meltpond namelist, but not for v3.2.
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Here's a couple of comparisons of broadband albedo between level/sealevel pond schemes with observations: 
Simulation with sea level ponds appears to do a better job in polar summers. |
njeffery
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njeffery
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Approved based on Darin's analysis. Differences in pond fraction are significant but broadband albedo changes are small and generally in the right direction. Pond seasonally appears to be more physical in the new scheme.
…8286) Change default sea ice melt pond scheme to sea level melt ponds Changes the default melt pond scheme in MPAS-Seaice to a sea level melt pond scheme, which became available with Icepack v1.5.3. [NML] [NCC]
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Passes (with expected baseline and NML DIFFs):
merged to next |
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merged to master and expected baseline and NML DIFFs blessed |
4 participants
Changes the default melt pond scheme in MPAS-Seaice to a sea level melt pond scheme, which became available with Icepack v1.5.3.
[non-BFB] [NCC]
[NML]