Question

what are the differences between tropical and sub tropical types of c?

Answer 1

Interesting question because tropical and subtropical are related to the tropics at 23.5 degrees north and south, and not necessarily a climate boundary. 

Generally speaking, the tropic is hot, air rises, pressure is low. The pole is cold, air sinks, the pressure is high. 

One could think that it would generate a wind near the surface from poles to the equator, and a reverse wind on the top of the troposphere. 

But the earth spins and that causes the Coriolis effect that turns any large body motion to the right in the northern hemisphere. 

The air that rises at the equator doesn't get a chance to reach the pole; it spins clockwise and creates a zone of high pressure around the latitude 30 degrees north (and south!) 

Furthermore, between that and the polar high pressure, a frontal zone of low pressures is creates at roughly latitudes 60 north and south. 

The tropical climate is then a place of warm low pressures. This is where you find the rain forest belt around the earth. 

The subtropical climate is then the belt around the earth where you find warm but dry air because it sinks. Those are the high pressures are roughly latitudes 30. That is where you find most deserts around the earth. 

The front at latitude 60 is then the front between polar and subtropical air masses. The latter climbs over the former because warmer and the process decreases the pressure thus forming low pressures.