Groundwater recharge CCSM3 - Paleoclimate simulation datasets

[femarivera]

Hello everyone,

I am a hydrogeologistn and I am researching about paleorecharge rates. I would like to rise a question about the CCSM3, specifally the version of the CLM used there, which I think it corresponds to the CLM3.

This has been used to run transient simulations of paleoclimate since the Last Glacial Maximum: the TraCE-22K-II

I saw another post speaking about the groundwater recharge in CLM5. And an answer from Dr. Oleson said that this is not meaningful in CLM5.

I would like to know if for the version of the CLM in CCSM3, there is some variable that is meaningful to calculate a groundwater recharge component.

I see in the list of land model fields there are QDRAI, QINFL, QINTR, QMELT, QOVER, QRGWL, QSOIL. I would like to know how are these terms related within th context of the model, and if (differently from CLM5) there could be a meaningful way to get an estimate of paleorecharges with this dataset.

Is it QDRAI, subsurface drainage, the water leaving the soil column towards deep percolation? or baseflow?

Thank you very much,
best regards

Felipe Marin

 

[slevis]

Yes, QDRAI is subsurface drainage.

Since you said that you are asking about CLM3, I will refer you to the CLM3 Technical Note, available from this link and probably other locations also.