undefinitely growing snow depth in CLM4.5 BGC spinup

[matteo_zampieri@cmcc_it]

dear All, I'm running a spinup simulations with CLM4.5-BGC (CESM1.2.2 release), which began from start and it is still in the accelerated modecompared to the standard case (I1850SPINUPCLM45BGC) I'm using a slightly different land-sea mask and active river flood
the problem is that there are some grid points in which the snow is growing undefinitely (6000m after 750 years), see attached figures showing the annual mean climatology at the end of the simulation of mean grid cell snow height did somebody encountered the same problem? thanks, cheers, Matteo

 

[matteo_zampieri@cmcc_it]

dear All, it looks like the problem is connected with the flood option: when surface water is generated in cold regions it may freeze and it is added to the snow columnthe model contains a check on excessive snow height but the only way it has implemented to counteract it is by bypassing snowfall, not the flux generated by the surface water freezing, that's why snow accumulates foreverI was thinking about adding a piece of code to prevent this, in SoilTemperature.F90 to send the freezed water into ice runoff instead of snow if do_capsnow is truehowever, I'm not sure if sending back this water from the land to the river model may cause some inconsistency cheers,  Matteo

 

[matteo_zampieri@cmcc_it]

dear All, I'm attaching the code modifications that works for me, I believe
I would be grateful if somebody could provide some feedback on this thanks, cheers, Matteo