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Troposphere dictionary definition

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the troposphere is the lowest major atmospheric layer, and is where all of our weather occurs

What is the troposphere?

The troposphere is the lowest major atmospheric layer, extending from the
Earth’s surface up to the bottom of the stratosphere .
The troposphere is where all of Earth’s weather occurs. It contains approximately 80% of the total mass of the atmosphere.

The troposphere is characterized by decreasing temperature with height (at an average rate of 3.5 degrees F per thousand feet,
or 6.5 degrees C per kilometer). In contrast, the stratosphere has either constant or slowly increasing
temperature with height.

The boundary between the troposphere and the stratosphere is called
the “tropopause”, located at
an altitude of around 5 miles in the winter, to around 8 miles high in the summer, and as high as 11 or
12 miles in the deep tropics.

When you see the top
of a thunderstorm flatten out into an anvil cloud ,
it is usually because the updrafts in the storm have reached the tropopause, where the environmental air is
warmer than the cloudy air in the storm, and so the cloudy air stops rising.

(page last updated 11/28/2010)

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Home British & World English troposphere

Definition of troposphere in English:

troposphere

noun

  • The lowest region of the atmosphere, extending from the earth’s surface to a height of about 6–10 km (the lower boundary of the stratosphere).

    • ‘The stratosphere extends above the troposphere to about 150,000 feet and is the region where the ozone layer is formed.’
    • ‘The stratosphere is the atmospheric layer between the troposphere and the mesosphere and extends from about 12 km altitude to about 50 km.’
    • ‘Also, the presence of stratospheric ozone sandwiched between the satellite and the troposphere makes seeing tropospheric ozone very difficult.’
    • ‘The other two climate records, so-called ‘upper air’ records, measure temperatures in Earth’s troposphere and stratosphere.’
    • ‘Because of the cloud spreading at the top, the height of the troposphere in the area can also be calculated.’

Origin

Early 20th century: from Greek tropos ‘turning’ + sphere.

Pronunciation

troposphere

/ˈtrɒpə(ʊ)sfɪə/ /ˈtrəʊpə(ʊ)sfɪə/

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