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Florestan
Since: May, 2015
higgledypiggledy
Since: Feb, 2011

It's very likely we don't have this exact trope because it's rare enough for us not to, but I think we probably have something related or a supertrope.
Basically, if a magical portal opens between two distant regions, one at a high altitude and one at a low altitude, no problems will result due to the difference in air pressure. There will be no gales rushing through the portal as the different air pressures try to equalize; a person passing through the portal will not suffer sudden intense altitude sickness, embolism, etc., or even their ears popping; stringed instruments brought through will not be damaged; etc.