How to add instantaneous SST & IFRAC field to history files

Hi,
I'm running coupled cesm1_0_5_rel03. I'm trying to get daily snapshot SST and IFRAC fields from the ocean component. I noticed that these two fields are not included in the list of available fields for snapshot history files. I want to learn how to modify the source code to make SST and IFRAC available. Can someone please point me in the right direction?
Thank you very much!

Jie
 
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