Troposphere

The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its water vapor and aerosols. The average depth of the troposphere is approximately 17 km (11 mi) in the middle latitudes. It is deeper in the tropics, up to 20 km (12 mi), and shallower near the polar regions, at 7 km (4.3 mi) in summer, and indistinct in winter. The lowest part of the troposphere, where friction with the Earth's surface influences air flow, is the planetary boundary layer. This layer is typically a few hundred meters to 2 km (1.2 mi) deep depending on the landform and time of day. The border between the troposphere and stratosphere, called the tropopause, is a temperature inversion.

The word troposphere derives from the Greek: tropos for "turning" or "mixing," reflecting the fact that turbulent mixing plays an important role in the troposphere's structure and behavior. Most of the phenomena we associate with day-to-day weather occur in the troposphere.

Read more about Troposphere:  Atmospheric Flow

Other articles related to "troposphere":

Aery - Structure of The Atmosphere - Principal Layers - Troposphere
... The troposphere begins at the surface and extends to between 9 km (30,000 ft) at the poles and 17 km (56,000 ft) at the equator, with some variation due to weather ... The troposphere is mostly heated by transfer of energy from the surface, so on average the lowest part of the troposphere is warmest and temperature ... The troposphere contains roughly 80% of the mass of the atmosphere ...
Tropospheric Emission Spectrometer
... instrument designed to measure the state of the earth's troposphere ... key data for studying tropospheric chemistry, troposphere-biosphere interaction, and troposphere-stratosphere exchanges ...
Atmosphere Of Uranus - Structure - Troposphere
... The troposphere is the lowest and densest part of the atmosphere and is characterised by a decrease in temperature with altitude ... The temperature falls from about 320 K at the base of the troposphere at −300 km to 53 K at 50 km ... The temperature at the cold upper boundary of the troposphere (the tropopause) actually varies in the range between 49 and 57 K depending on planetary latitude, with the lowest temperature reached near 25 ...
Aery - Images From Space
... bottom transitioning into the orange-coloured troposphere ... The troposphere ends abruptly at the tropopause, which appears in the image as the sharp boundary between the orange- and blue- coloured atmosphere ... The silvery-blue noctilucent clouds extend far above the Earth's troposphere Space Shuttle Endeavour appears to straddle the stratosphere and mesosphere ...