Mongolia will have a climate equivalent to southern Canada today, after the pole shift, which will be only a slight adjustment to what it experiences today. It will not be in the ash fall from the volcanoes in Kamchatka, as clean air coming off what was formerly the Arctic and what will be the flooded lands of Siberia will be their prevailing winds. Thus, though not heavily populated today, Mongolia should support survivors well. The populace of Mongolia is self sustaining, rural, and hardy.
Note Hot Springs commentary.
Note Elite Migration commentary.