Geography; summary; chapter 3; 3TVk
3.1: air flows and ocean currents
At the earth’s surface, air is pressed together. This is because the gravity pulls them all
down, it’s pressed down from the weight above. Because air is a gas it pushes in all
directions. Temperature effects air density, warmer air is less dense and therefore rises. Air
always flows from high pressure areas to low pressure area’s (depression). But this isn’t a
straight flow, because of the earth’s rotation. In low pressure areas there’s a lot of
precipitation, and in high pressure areas it’s relatively dry.
Cold air creates high pressure
Cold air from poles arms up, creates low-pressure
Cooled down air from the equator descends
(high pressure)
Warm air creates low pressure
Most deserts are present around the sub
tropicals from about 30˚ from equator
Warm ocean currents flow from the equator to the poles (cause higher temperatures). Cold
ocean currents flow from the poles to the equator (cause lower temperatures). The saline
water created during the freezing of ice, the more saline water there is, the heavier. This is
why there are water sink regions, there are areas where the cold, saline water sinks.
3.2: natural fluctuations
Climate change can happen due to natural fluctuations. They have actually been caused by
natural fluctuations, because humans weren’t there yet. There are three patterns
considering the natural fluctuations:
- Change in earth’s orbit, that can be almost circular. Or, it can be an epileptical orbit
(because of the changing gravitational attraction of Saturn and Jupiter).
3.1: air flows and ocean currents
At the earth’s surface, air is pressed together. This is because the gravity pulls them all
down, it’s pressed down from the weight above. Because air is a gas it pushes in all
directions. Temperature effects air density, warmer air is less dense and therefore rises. Air
always flows from high pressure areas to low pressure area’s (depression). But this isn’t a
straight flow, because of the earth’s rotation. In low pressure areas there’s a lot of
precipitation, and in high pressure areas it’s relatively dry.
Cold air creates high pressure
Cold air from poles arms up, creates low-pressure
Cooled down air from the equator descends
(high pressure)
Warm air creates low pressure
Most deserts are present around the sub
tropicals from about 30˚ from equator
Warm ocean currents flow from the equator to the poles (cause higher temperatures). Cold
ocean currents flow from the poles to the equator (cause lower temperatures). The saline
water created during the freezing of ice, the more saline water there is, the heavier. This is
why there are water sink regions, there are areas where the cold, saline water sinks.
3.2: natural fluctuations
Climate change can happen due to natural fluctuations. They have actually been caused by
natural fluctuations, because humans weren’t there yet. There are three patterns
considering the natural fluctuations:
- Change in earth’s orbit, that can be almost circular. Or, it can be an epileptical orbit
(because of the changing gravitational attraction of Saturn and Jupiter).
