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

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

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!

Yongxiao

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               = 2000

srf_emis_cycle_yr              = 2000
ext_frc_type           = 'CYCLICAL'
srf_emis_type          = 'CYCLICAL'

Simone

yongxiao@...

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!

 

Yongxiao

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@...

thanks for your nice guide!

Yongxiao

yongxiao@...

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

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

 

quamarulim@...

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

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