Compare to the colder regions,the tropical regions experiences low atmospheric pressure.Why??
Answers
Explanation:
Low atmospheric pressure at the surface is generally caused by warm air at the surface rising through cooler air aloft. The air cools as it rises, so it has to be much warmer than the air aloft to continue to rise instead of just cooling down and stopping its ascent.
The surface of the Earth around the equator gets the greatest proportion of direct Sunlight over the course of a year, so it always stays comparatively warm. That warm surface in turn warms the air near the surface and causes it to rise.
Air rising at the surface is low pressure at the surface.
Answer:Low atmospheric pressure at the surface is generally caused by warm air at the surface rising through cooler air aloft. The air cools as it rises, so it has to be much warmer than the air aloft to continue to rise instead of just cooling down and stopping its ascent.
The surface of the Earth around the equator gets the greatest proportion of direct Sunlight over the course of a year, so it always stays comparatively warm. That warm surface in turn warms the air near the surface and causes it to rise.
Air rising at the surface is low pressure at the surface.
When that air rises, air at the surface from the north and south of the equator gets sucked in to replace it. As air at the surface to the north and south of the equator gets sucked toward the equator, air in the upper atmosphere over those regions gets sucked down to replace it. As that air gets sucked down the air that originally rose at the equator gets sucked across the upper troposphere to replace it.
Due to Coriolis effect and textbooks’ worth of factors, that particular circulation I described occurs with air rising at the equator and sinking over areas around 30 degrees of latitude.
Sinking air at the surface is high pressure.
Since rising, humid air is what causes clouds and rain, and sinking or stable air can't make rain, we see lots of precipitation and rain forests around the equator and lots of dry, desert areas around 30 degrees north and south latitude. There are exceptions, of course. Sometimes other geological features, like mountain ranges or oceans and gulfs, can affect the weather patterns and turn an equatorial region into a desert or produce a lot of rainfall in a specific region in that 30 degree latitude band.
There are variations in day-to-day or even yearly weather patterns over any specific place, as well. It's when we're looking at the big picture, averaging it over time, that we can say the equator is a low pressure region with lots of rainfall and the 30 degree latitudes are (generally) high pressure regions with little precipitation.
To get rising air circulations we don't need hot air. We just need air at the surface which is much warmer than the air above it. That's why we get another band of surface low pressure (rising air) at around 60 degrees latitude in each hemisphere. That air tends to split, north and south, with some falling as high pressure over the poles and some falling over the 30 degree latitude band and contributing to the high pressure there. These are just the big, global patterns. Within the global pattern there are smaller, local patterns which dictate local climate.
Explanation: