can I run prescribed aerosols with aquaplanet?

[mfwehner@lbl_gov]

If build with this directive./xmlchange -file env_build.xml -id CAM_CONFIG_OPTS -val "-phys cam5 -chem none"

I get this error in the configureERROR: aquap is not a valid value for parameter ocn: valid values are docn,dom,socn,aquaplanet,pop2
ERROR: cam.buildnml.csh failed
ERROR from preview namelist - EXITING

My motivation is simply to go faster but the larger question is what does the aerosol package do in aquaplanet mode? Are the aerosols zonally symmetric?ThanksMichael

 

[jedwards]

I think that you may have tried to configure a bad compset, the compset that you want for cam5 aquaplanet is:

FC5AQUAP

The 1.2.2. release also contains a  F_AQUAPLANET compset which is broken.   Sorry for the confuson. 

 

[jedwards]

Looking at our past correspondense I think that you already have the correct compset...   I remember a discussion about this some time ago.   There is an inconsistantcy between aerosols and aquaplanet in cam5. 

 

[santos]

Right now it appears that cam.buildnml.csh passes an incorrect ocean argument to configure, but then CAM_CONFIG_OPTS contains a second ocean specification that "wins" because it comes later in the call. With CAM_CONFIG_OPTS being overwritten, the incorrect argument is used by configure, and it issues the error message.We should do something to make this more robust, but the simple workaround is to add "-ocn aquaplanet" to CAM_CONFIG_OPTS.I do not recall specifically what the aerosol package does in aquaplanet mode, but my recollection is that:

1. You probably want prescribed aerosols (not prognostic) aerosols for aquaplanet, due to the absence of prognostic sources. (I.e. there is no dust emitted from the land when there is no land; I don't believe that aquaplanet produces sea salt either.)
2. Prescribed bulk aerosols are trusted in this case more than prescribed modal aerosols, in which case you want to set prescribed_aero_model = "bulk" in the namelist (otherwise the default is "modal" for CAM5).

Take this advice with a grain of salt, since I'm repeating half-remembered suggestions.