Describe how air mass would move on an ideal, nonrotating Earth. (7).
1. Equator oceans are warmer (higher solar heating), so heat transfers via evaporation is greater at equator. Atmosphere absorbs more heat from land/ocean than from sun; solar heating is greatest at equator, so at equator, ocean water is warmer, so heat of transfer of water by evaporation from ocean --> atmosphere is greater at equator than at higher latitudes.
2. Equatorial air mass rises through troposphere, creating low pressure zone & horizontal pressure gradient (atm, sea level).
3. Rising air is replaced by air flowing into region from higher latitudes.
4. When air mass rises to equilibrium density level, it spreads towards poles, progressively cooling & releasing water vapor as rain.
5. Air mass is cool/dense enough (via condensation) sink and create high pressure zone (atm, sea level).
6. Air moves "vertically" from pole --> equator along horizontal pressure gradient (high P to low P).
7. As air moves back to equator, it's warmed & gains water vapor from evaporation and cycle repeats.
Evaporation, rise (creating low P & horizontal PG), replaced, spreads/cools, sinks (creating high P zone), moves along HPG, warmed/gains water vapor.