Atmosphere Flashcards
Exosphere-
last layer. Night freezing cold during the day is very hot.
Thermosphere- temperature reaches up to 5 thousand degrees fahrenheit. Conserves lots of solar radiation
Mesosphere
coldest layer of atmosphere,most meteors burn up.
Stratosphere
20% of the earth’s gas. Protects us from harmful layers of the sun.
Troposphere
first layer of atmosphere which we all live in. where we get out weather it traps the sun’s heat close to our planet
Global Transfer of Energy
Atmospheric circulation
In addition to the sun coming into the earth the atmosphere has cells move then projects the sun on earth.
The polar regions are getting less heat that the tropical regions.
The cells in the atmosphere go up in 30 degree sections
Hadley Cell
Hadley = Hot. Warm air rises from the equator and travels to around 30 degrees north where it cools and sinks to the surface before returning to the tropics.
At the equator there is an area of low pressure, due to rising and expanding air. At around 30 degrees north, sinking air creates an area of high pressure. This cell is thermally direct.
Ferrel Cell
The feral cell is the middle cell and is found between the hadley and polar cells and lies between 6o degrees north and 30 degrees north. Ferrel cell is thermally direct as it is powered by the other two cells. In reality the effect of bad weather.
Polar Cell
The polar cell is much smaller and is thermally direct. Cold air sinks at the north pole , before flowing south at the surface. Here it is warmed by the contact with land/ocean around 60º North, where it rises
Factors affecting pressure and wind patterns
Coriolis Effect - Winds blowing from high to low pressure are deflected by the spinning of the earth.
Rossby Waves- Are wave like patterns found within the westerly wind belts. They form as a result of temperature and pressure differences.
Jet streams - The jet stream exists largely because of a difference in heat, which in the northern hemisphere means cold air on the northern side of the jet stream and warm air to the south.
Rotation of the Earth - This movement tends to deflect air from the poles towards the equator.
Land and Sea Mass - The rate of heating and cooling varies greatly over different land and sea areas. This creates distortions in the pattern of pressure belts, with a corresponding effect on winds.