how to fix aerosols at years 2000 and 1850 based on cam5.1 model

[yongxiao@hotmail_com]

Dear
In order to study the impacts of aerosols, I need process a experiment fixing aerosols at years 2000 and 1850 based on cam5.1 model.but i do not know where should i modify before running this model? could you give me some suggestions?
thanks and best regards!

 

[tilmes]

Hi Yongxiao,if you want to run a transient model simulation with fixed aerosol emissions to the year 2000 or 1850, you can change the namelist (user_nl_cam) and set for example for year 2000 emissions, with this all the emissions are set to the year 2000, not only the aerosols.ext_frc_cycle_yr               = 2000srf_emis_cycle_yr              = 2000
ext_frc_type           = 'CYCLICAL'
srf_emis_type          = 'CYCLICAL'

Simone

 

[yongxiao@hotmail_com]

Dear thanks for your nice guide .i am a new one of cam user , i could not find the user_nl_cam .could you tell me the root of user_nl_cam  or how to set then can make the user_nl_cam out .best regards! 

 

[tilmes]

for basics on how to run CESM and apply simple changes I would recomment for you to attend the next CESM tutorial or look at this online:http://www2.cesm.ucar.edu/events/tutorials/Simone

 

[yongxiao@hotmail_com]

dear thanks for your nice advice . if i  want to fix aerosols at years 2000 only other than all emissions based on cam5.1 model,how could i set?best regards 

 

[yongxiao@hotmail_com]

thanks for your nice guide!

 

[quamarulim@gmail_com]

Thanks. The thread helps me to fix my issue also. 

 

[tilmes]

Dear Yongxiao,surface and vertical emissions in CAM are for aerosols or for aerosol precursors (like SO2, or DMS). If you don't want to use the 'CYCLICAL' option to fix the emissions for a certain year, you will have to modify your transient emissions for only the specific species in a way that 2000 emissions are repeated for all the years.Simone