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ncl scripts to create SST/ICE data files to drive an F compset using B compset history files

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hannay
ncl scripts to create SST/ICE data files to drive an F compset using B compset history files

Attached are two scripts that allows to create SST/ice files to process B compset history output and create SST/ICE data files to drive an F compset.
There are 2 versions of the script depending if you want to use the icesst tool or not. Both scripts use single variable timeseries of SST and aice (SH and NH)

 

1. create_SST_files_from_B_case_without_bcgen.ncl
Regrid the SST and sea-ice data from the B compset and create files in an appropriate format to run with CAM

2. create_SST_files_from_B_case_with_bcgen.ncl
Regrid the SST and sea-ice data from the B compset and create files in an appropriate format for processing with bcgen (you need to run bcgen afterwards to have a SST/ICE dataset in an appropriate format to run with CAM

 

 

rambhari0123@...

Dear Hannay,


I read you ncl code to create the SST and SIC fields for F compset. at the end of script you used the SST-ICE consistency steps as described in Hurrell et at 2008. I read the hurrell's paper and try to understand each step. I feeel that Hurrell doesn't used the step number 3 (as Written in NCL Script) but you had mentioned here. I am trying to unserstand how step 3 is different from 5. I feel that if i use only step number 5, step 3 will be covered under it.

I tried to avoid step 3 but bcgen throughs error

 latitude =           172  longitude =           110
 does not converge

I request you to please explain the difference between the step number 3 and 5. why is it nacessary to use both ??

Thanking you in anticipation.

Ram

hannay

The reason I am doing these 5 steps is that if I use mean SST and sea-ice without any correction, there will be inconstitency along the ice edge. 

My script doesn't follow the procedure from Hurrell but it uses the relationship in Hurrell. The reason I decided to use the relationship both way if I was concerned there might be instances that step 3 doesn't necesssary capture every inconsistency. 

This is not an official CESM script. This is my own script that I wrote for my own purpose. I share it with others for their convenience. You are welcome to use step 5 instead of step 3 and then look at the fields to see if there is any inconsistency. Or to modify the script in a way that you want. 

 

 

huili7@...

Dear Hannay,

Thanks for sharing the ncl scripts. I found another procedure of creating the SST/ICE data file from the CESM user guide FAQ section. It looks like that method doesn't require regridding to a the 1x1 grid, but instead making changes on the original gx16 grid.  I'm wondering if these two methods would yield the same forcing file for CAM. If not, which one would be the prefered method? 

 

In addition, I found that the SST filed in the B compset output has missing values over land, while the other SST/ICE forcing files from the input repository (e.g. AMIP) do not treat the land as missing. This difference will cause the model to crush. The cesm user guid suggests changing the missing values over land to -1.8, and I'm wondering where does the value of -1.8 come from?

 

Thank you very much in advance. 

Hui

 

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