Biogeochemical model CESM1.1.1.– where is CASAmod?

[h_post@fz-juelich_de]

The casaMod and CASAPhenologyMod scripts in the folder models/lnd/clm/src/biogeochem of CESM version 1.0.4. are gone now in the new CESM version 1.1.1., even though they contain the some of the most important contents of CLM-CN (version 4.0) . Where are they now? Why have they been removed? And will CESM1.2 with CLM4.5. again have a different folder/file structure or will it be the same as in CESM1.1.1.? Looking forward to your reply.

 

[slevis]

I think that your statement "casaMod and CASAPhenologyMod [...] contain the some of the most important contents of CLM-CN" is incorrect. The CN and the CASA options were mutually exclusive. If you do not see CASA code in the CESM version 1.1.1, then we've removed them.
Expect some similarities and some changes when you download the next release.

Sam Levis

 

[slevis]

I think that your statement "casaMod and CASAPhenologyMod [...] contain the some of the most important contents of CLM-CN" is incorrect. The CN and the CASA options were mutually exclusive. If you do not see CASA code in the CESM version 1.1.1, then we've removed them.
Expect some similarities and some changes when you download the next release.

Sam Levis

 

[h_post@fz-juelich_de]

Thanks for the reply. I installed CESM version 1.0.4.with CLM 4.0. Here, CASAmod indeed contains many important parameter definitions and biogeochemical calculations as for example:
·definition of the CNpools with the specific C/N ratios
·turnover times of the CNpools
·initialization of pool sizes
·the subroutine casa_allocate to provide dynamic or fixed carbon allocation.
·the subroutine casa_bgfluxes to compute biogeochemical fluxes.
- the subroutine casa_litterfall to compute dynamic litter fall
So when the entire module has been removed, I would assume that these calculations were somehow moved to other scripts or substituted completely in another script (containing "CN" instead of "CASA"). Do you mean with “CN and CASA are mutually exclusive” that the CASAmod is actually not used when running CLM 4.0 with CN? Could you please tell me the name of the script where the biogeochemical fluxes etc. mentioned above are then calculated in “CN” / CESM 1.1.1.?

 

[h_post@fz-juelich_de]

Thanks for the reply. I installed CESM version 1.0.4.with CLM 4.0. Here, CASAmod indeed contains many important parameter definitions and biogeochemical calculations as for example:
·definition of the CNpools with the specific C/N ratios
·turnover times of the CNpools
·initialization of pool sizes
·the subroutine casa_allocate to provide dynamic or fixed carbon allocation.
·the subroutine casa_bgfluxes to compute biogeochemical fluxes.
- the subroutine casa_litterfall to compute dynamic litter fall
So when the entire module has been removed, I would assume that these calculations were somehow moved to other scripts or substituted completely in another script (containing "CN" instead of "CASA"). Do you mean with “CN and CASA are mutually exclusive” that the CASAmod is actually not used when running CLM 4.0 with CN? Could you please tell me the name of the script where the biogeochemical fluxes etc. mentioned above are then calculated in “CN” / CESM 1.1.1.?

 

[slevis]

"Do you mean with “CN and CASA are mutually exclusive” that the CASAmod is actually not used when running CLM 4.0 with CN?"
YES.

"Could you please tell me the name of the script where the biogeochemical fluxes etc. mentioned above are then calculated in “CN” / CESM 1.1.1.?"
Look in CLM's /src/biogeochem directory, and you will find everything that you're lookiing for.

Sam Levis

 

[slevis]

"Do you mean with “CN and CASA are mutually exclusive” that the CASAmod is actually not used when running CLM 4.0 with CN?"
YES.

"Could you please tell me the name of the script where the biogeochemical fluxes etc. mentioned above are then calculated in “CN” / CESM 1.1.1.?"
Look in CLM's /src/biogeochem directory, and you will find everything that you're lookiing for.

Sam Levis