[Liwg-core] Strange ablation patterns of downscaled SMB in CMIP6-4xCO2

Kampenhout, L. van (Leo) L.vanKampenhout at uu.nl
Wed Dec 19 02:55:46 MST 2018

Hi Raymond,

Thanks for sending the plot! I’ve never seen this happening before.

My guess is that this is grid imprinting from the CAM grid.
The “blob” would be a grid cell where accumulation is low and ablation starts developing.
At the coast there is generally a bit more precip that might hold off the ablation longer.
The elevation corrections that are in place (rain-to-snow conversion, LW and temperature lapse rates) potentially make the problem worse.


On 19 Dec 2018, at 10:40, Raymond Sellevold - CITG <R.Sellevold-1 at tudelft.nl<mailto:R.Sellevold-1 at tudelft.nl>> wrote:

Hello everyone,

I have been going through the downscaled SMB in the 4xCO2 run in the CMIP6 archive at cheyenne. As expected, large ablation areas appear, but the way they appear seems quite strange. Rather than having a movement of the equilibrium line, small blobs/islands starts to form slightly above the equilibrium line, and as time goes they expand and merge with the pre-existing ablation areas. Here is an animation where you can see this: https://surfdrive.surf.nl/files/index.php/s/W9wx6MpDYFE013i

Does anyone have any idea why ablation areas are expanding this way, and is this something to worry about?

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