user_nl_cice (with the compset of B_RCP4.5_CN)

[hspark1@gmail_com]

Hello, I am trying to understand the impact of sea ice albedo on the seasonal cycle of sea ice volume.I managed to decrease ice albedo simply by adding three lines in the namelist, user_nl_cice:&ice_nml
albicev = 0.6
albsnowv = 0.8=> It works well for the present  day simulations, such as B_2000_CN; the Arctic sea ice concentration and thickness substantially decrease in 15 years.However, there is no change in sea ice volume in the case when this method (changing 'user_nl_cice') is applied to RCP scenarios, such as B_RCP4.5_CN:In B_RCP4.5_CN simulation, there is no difference in sea ice volume between the default ice albedo and the modified ice albedo.    

 

[dbailey]

What shortwave are you using? If it is shortwave = 'dEdd' then these have no effect. See the following FAQ:https://bb.cgd.ucar.edu/faq-albedoradiation-tuning-cesm-ciceDave

 

[hspark1@gmail_com]

Thank you! The problem has been solved by setting shortwave = 'default'.