LYCOS RETRIEVER 
Troposphere
built 655 days ago
The Troposphere is the lowermost portion of Earth's atmosphere and the one in which clouds and most other weather phenomena occur. This layer extends from the surface of the Earth to an altitude of 16-18 km over tropical regions, decreasing to less than 10 km over the poles,(6) and contains approximately 80% of the total air mass though it is the smallest of all the atmospheric layers. Generally, commercial planes fly near the top of this layer. The word troposphere stems from the Greek "tropos" for "turning" or "mixing". It is divided into six zonal flow regions, called cells. These cells are responsible for atmospheric circulation, and produce the prevailing winds.
Source:
The NCEP GDAS and CPC temperature and height analyses are used to monitor processes in the Stratosphere and Troposphere. In the table below are zonal mean time series of Temperature, Zonal Wind Component, amplitude of the height field's Wave 1, Wave 2, and Wave 3.
Source:
Troposphere, lowest layer of the earth's atmosphere and the site of all weather processes making up its climate (weather over long periods of time). The troposphere extends up to an altitude of about 11 km (7 mi) above the polar zones and to about 16 km (10 mi) above the equatorial regions. The tropopause forms the boundary between troposphere and stratosphere.
Source: