Just breathtaking. I shoot nature and wildlife and would dream of such a trip and opportunity. Your photo is simply perfect.
Realizing this is not the purpose of this thread, perhaps you will permit me a question
I am assuming the camera is 1DX (didn't know that "X" model was out but I'm guessing ) and 200-400 is a zoom lens?
I use the f 2.8 300mm lens (link below) and wonder if I can ask why you chose a zoom with in built TC? Do you want the flexibility? I have 2 extenders (one 1.4 TC and one 2.0 TC) and will flip those on but acknowledge that light can be a challenge and yes, it means sometimes missing a shot.http://www.canon.ca/inetCA/products?m=gp&pid=2162
Anyway, it's lovely and while the artic expedition seems pretty remote for me, I'm in Ontario, so perhaps I can go to Churchill Manitoba instead and get a shot that might not be as good, but still interesting.
ETA: I just looked at your website, and your photographs are beautiful.