Creating an ocean grid for deep time

[Siva]

Hello,

I am a PhD student. I couldn't find an answer to my question in all relevant threads on this topic and hence I'm posting this query. Your suggestions would be very helpful.

I will be creating a new ocean grid for the mid-cretaceous but first I am testing the 'PaleoToolkit' configuration for the present-day topo. For the recommended settings given in the document (nlatnxnlats - 209x175, dyeq ~ 0.26, dsig~30, jcon~11-20) the north grid pole disk on Greenland turns out to be larger in diameter than the pole disk in CESM default configured kmt files and hence doesn't fit on the land. I figured that I can decrease the size of the pole disk by either making dsig~15 or jcon>40 or nlatn >230(which is too far away from an even distribution) or of course, combinations of these.

My question is, which parameter(s) can I change away from the recommended values without causing model instability and also keeping the configuration of my baseline simulation using my PI kmt close to the default CESM PI kmt configuration?

Thank you.

 

[jiangzhu]

Sorry, I don't have good answer for your questions.

Have you explored the available Cretaceous setup using CESM? For example, you may consider reaching out to authors of this paper Tabor et al. (2016; The cause of Late Cretaceous cooling: A multimodel-proxy comparison | Geology | GeoScienceWorld).

I think for deep-time simulation setup, it is OK to have two separate horizontal grids (including kmt configurations).

 

[Siva]

Thank you for your reply. I will look into the study and if needed will reach out to the authors about the Cretaceous setup.