Are CH4, N2O, CFC-11 and CFC-12 prognostic constituents in WACCM?

[simchan_yook@colostate_edu]

Hi all, I'm currently working on the output of Specified Chemistry WACCM (SC-WACCM) and original CESM1 WACCM (output from ESD CCSM run b40.1850.track1.2deg.wcm.007).From documentation of SC-WACCM (smith et al. [2014]), found that in SC-WACCM, CH4, N2O, CFC-11 and CFC-12 are all prognostic constituents which has specified concentration at the surface and calculated vertical profile using the loss rate from Garcia and Solomon two-dimensional model. My question is,whether (original) WACCM has fully interactive chemistry for these species rather than specifying the concentration at the surface and simply calculating loss rate as in SC-WACCM? Thank you,Shim 

 

[tilmes]

Hi Shim,all current WACCM versions prescribe these greenhouse gases as concentrations at the surface. However, much more comprehensive chemistry in WACCM results in chemical changes of these species in the atmosphere.Simone 

 

[tilmes]

Hi Shim,all current WACCM versions prescribe these greenhouse gases as concentrations at the surface. However, much more comprehensive chemistry in WACCM results in chemical changes of these species in the atmosphere.Simone 

 

[simchan_yook@colostate_edu]

Hi Simone, Thank you very much for your answer!Now I could figure out why the greenhouse gases concentrations within the troposphere were different in WACCM and SC-WACCM. Shim

 

[simchan_yook@colostate_edu]

Hi Simone, Thank you very much for your answer!Now I could figure out why the greenhouse gases concentrations within the troposphere were different in WACCM and SC-WACCM. Shim