Difference between CESM2 and CESM2-FV

[UllaH]

Hi all,

I've been looking at CMIP6 data a lot recently, and there are four versions of CESM2 on the archive:

CESM2
CESM2-FV
CESM2-WACCM
CESM2-WACCM-FV

I understand the difference between CESM2 and CESM2-WACCM. But what's the difference between CESM2 and CESM2-FV? I'm assuming FV is finite volume, but in that case, is the regular CESM2 spectral element? And which grid, more specifically, are they using for both?

I haven't been able to find this information online so far, so I'm wondering anyone in this forum can help me out.

Thanks in advance!
Ulla

 

[islas]

Hi Ulla,

I think the four versions available are actually CESM2, CESM2-FV2, CESM2-WACCM and CESM2-WACCM-FV2 (i.e., with a 2 after the FV's). They are all using the finite volume dynamical core but CESM2 and CESM2-WACCM have approximately 1 degree resolution while CESM2-FV2 and CESM2-WACCM-FV2 have approximately 2 degree resolution.

Isla

 

[strandwg]

Hi all,

I've been looking at CMIP6 data a lot recently, and there are four versions of CESM2 on the archive:

CESM2
CESM2-FV
CESM2-WACCM
CESM2-WACCM-FV

I understand the difference between CESM2 and CESM2-WACCM. But what's the difference between CESM2 and CESM2-FV? I'm assuming FV is finite volume, but in that case, is the regular CESM2 spectral element? And which grid, more specifically, are they using for both?

I haven't been able to find this information online so far, so I'm wondering anyone in this forum can help me out.

As Isla notes, the "FV" part is actually "FV2", and that denotes finite volume with a resolution of about 2 degrees. The lack of "FV2" means the default 1 degree resolution.