What is the relative importance of vertical versus horizontal heat transport?
The troposphere is comparable in thickness to the skin of an apple. The distance from the equator to the pole is 10,000 km while the maximum height of the troposphere is 20 km; a width-to-height ratio of 500:1. Vertical heat transport is more important than horizontal heat transport, but the wind blows mainly in the horizontal direction because of the large width to height ratio.