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Transcript of Chapter8 outline
An air mass: large body of air nearly uniform temp/humidity. Boundary between air masses of diff density is called: Front.
Extratropical cyclones form between polar cells and ferrel cells.
Tropical cyclones are big masses of warm,humid, rotating air. The atmosphere is the gas , water vapor and air enveloping the earth.
Weather, climate and precipitation all have to do with the atmosphere.
Atmospheric circulation is powered by sunlight. The heat input and outflow "account' for Earth is its heat budget.
The circular current of air in the room, a convection current, is caused by the diff in air density resulting from temp diff. Is the eastward rotation of earth on its axis deflects the moving air or water away from its initial course.
Example: The equatorial city of Quito,Ecuador and Buffalo, NY. Both cities are almost on 79 degrees longitude West. Both cities make one trip around the world each 24 hrs. The north/south relationship of these cities never change. There are large circuits of air called atmospheric circulation cells and there are six of these. Aka the "Hadley Cells"
A more complex pair of circulation cells operate at mid-latitudes in each hemisphere.
The mid-latitude circulation cells of each hemisphere are named Ferrel Cells. At the boundaries between circulation cells, the air is moving vertically and surface winds are weak and erratic.
At 30 degrees there are circ cells where air moves rapidly horizontally.
Special term for calm equatorial areas where surface winds of the two Hadley cells converge: the equatorial low called the doldrums.
Gloomy, listless mood reflecting sultry air and variable breezes are called intertropical convergence zones.
The convergence zones lie at the meteorlogical equator.