Unlimited dew (in theory)
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- fortran
- Domain
- hpc
Research direction
Trace the existing is_qneg handling and compare it with the atmosphere's qneg4 or qneg3 checks. Follow how negative evap*dt is applied to the bottom atmospheric level and verify the available moisture constraint. Done means land hydrology cannot receive more dew than the atmosphere contains, including during spinup and unusual configurations.
Written by the indexing model from the issue text.
Description
The land can pull water from the atmosphere as negative latent heat flux - basically dew, latent heat flux from the atmosphere to the land. Most latent heat flux goes land-to-atmosphere, but a little bit can and does go the other direction. Right now, the magnitude of evapdt when evapdt < 0 isn't capped by the amount of moisture available in the bottom level of the atmosphere. So in theory, the atmosphere could be completely dry, and the land could invent a nice big flux of dew from thin air and do land-hydrology with it. The atmosphere has a check to correct this (the qneg4 function, I think, or maybe qneg3?), which I started trying to implement years ago but had trouble getting it working, and I ended up abandoning it as (a) I think this only ever has large-ish values early in spinup and (b) I don't think CLM bothers with this check. However, if we start pushing the model into weirder configurations (like moving continents around), I could see this potentially being a bit of an actual issue. So I should take another stab at this check. Variable to look for where I started trying to do this is is_qneg .
- Dominant language
- Fortran
- Stars
- 15
- Forks
- 9
- PR merge metrics
- No merged PRs in 30d
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