Thank you very much for your reply, Kate! And sorry for the late answer; I just found the time to take a closer look at your suggested domain very recently. I also found a GitHub (yours?) with ARC-NATL header files so I'll take a look into them in order to examine the resolution and extent. From what I read in Budgell's literature, however, it might be to coarse but some other people (e.g. Melsom et al., 2009) refined and regionally restricted this domain. So the hint leading to Budgell was great!
I'll keep this post updated about further progress.
