Importing aerosol data

[TCNasa]

Does anyone know of any tutorials or documentation to explain the steps needed to imported rectangular gridded aerosol data into CAM?
I know about namelists, but is there a routine to "chunkify" such data so that it can be assigned to the phys_state structure?

 

[cacraig]

Moving this to the CAM-Chem forum as they are the developers of the aerosol code in CAM

 

[rrbuchholz]

Hi TCNasa,
Can you give a little more information? Are you wanting to read in aerosol fields as prescribed data (as opposed to reading in aerosol emissions)?
Thanks,
Rebecca

 

[TCNasa]

I'm exactly sure how they will be used, but we are trying to read in hourly aerosol optical depths on a rectangular grid. We need to match the appropriate timestep in CAM as well as the map them to the chunking scheme so we can assign them to the phys_state array.

 

[TCNasa]

I can add a subroutine to read in my data, but I don't know how to "incorporate" it into CAM processing

 

[TCNasa]

A more specific question, a colleague found some documentation on the older CESM 1.0 which discusses importing non-standard data into the input stream using namelist options:

https://www.cesm.ucar.edu/models/cesm1.0/data8/data8_doc/c72.html

I assume CESM 2.2 has a similar functionality? If so, if we adequately describe the input data, does CESM automatically sync the model time and perform the chunking process to import it?

 

[rrbuchholz]

This sounds like perhaps you want to use nudging, because AOD is calculated in the model and you want to move it towards the data (maybe at 100%). I contacted the person in charge of developing nudging and this is their response:

They can use the nudging.F90 module as a guide and rather than read in
U,V,T,Q,PS, read in their data. Once in, they can see where nudging is
applied in physpkg.F90 and replace that usage with their desired use.

One question I have for you is: How you will make sure that the AOD from your files matches or updates the aerosol species in CAM.

 

[nuvolet]

This sounds like perhaps you want to use nudging, because AOD is calculated in the model and you want to move it towards the data (maybe at 100%). I contacted the person in charge of developing nudging and this is their response:

One question I have for you is: How you will make sure that the AOD from your files matches or updates the aerosol species in CAM.

Do you know if the AOD ('AEROD_v','AODVIS','AODVISdn') is calculated as combination of all the AOD of the different components that the MAM4 has?.
Initially the files we are using are the Aerosol_Optical_Thickness_550_Land_Ocean_Mean, so it would be read total aerosol optional thickness.
Do you know who is the person in charge of developing nudging? I am asking for possible further questions.
Additionally my colleague Tom can also give more details of it.
Thanks in advance