tro·​po·​sphere | \ ˈtrō-pə-ˌsfir How to pronounce troposphere (audio) , ˈträ- \

Definition of troposphere

: the lowest densest part of the earth's atmosphere in which most weather changes occur and temperature generally decreases rapidly with altitude and which extends from the earth's surface to the bottom of the stratosphere at about 7 miles (11 kilometers) high

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Other Words from troposphere

tropospheric \ ˌtrō-​pə-​ˈsfir-​ik How to pronounce tropospheric (audio) , ˌträ-​ , -​ˈsfer-​ \ adjective

Examples of troposphere in a Sentence

Recent Examples on the Web That is because little has been done to help pilots detect avian threats that materialize at altitudes above 2,500 feet, the portion of the troposphere where roughly 10 percent of bird strikes occur. Brendan I. Koerner, Wired, "It's a Bird! It's a Plane! The Midair Collisions Menacing Air Travel," 24 Jan. 2020 The one just described resides in the lower atmosphere (in the troposphere) and is most frequently referenced by weather forecasters. Matthew Cappucci,, "Bombogenesis, thundersnow and the polar vortex: Explaining what your favorite winter weather terms mean," 21 Nov. 2019 The soot particles generated by these fires would be lifted into the upper troposphere. Scott K. Johnson, Ars Technica, "Misery of a nuclear war between India and Pakistan would be global," 4 Oct. 2019 Meanwhile, the upper troposphere above the equator features increasing average temperatures. Andrew Freedman, Anchorage Daily News, "Buckle up: Climate change is already contributing to bumpier North Atlantic flights, study finds," 7 Aug. 2019 In addition, a warming polar environment will expand the weather-containing troposphere, Thoman said. Robin George Andrews, National Geographic, "Lightning struck near the North Pole 48 times. It's not normal.," 13 Aug. 2019 Heat and humidity are high enough to allow the clouds to form and the tropopause—the boundary between the troposphere and stratosphere—is about 10 miles up, giving large storms plenty of room to form. Jason Daley, Smithsonian, "Rare Lightning Strikes Detected 300 Miles From North Pole," 14 Aug. 2019 Above the troposphere is the stratosphere, the layer that protects Earth from ultra-violet radiation. Annie Gentile,, "Cheney Homestead Presents “1816: The Year Without A Summer”," 15 Aug. 2019 Yet lower down in the troposphere, the opposite is taking place: Temperature changes are weakening the temperature gradient, and are expected to slacken the jet stream. Andrew Freedman, Anchorage Daily News, "Buckle up: Climate change is already contributing to bumpier North Atlantic flights, study finds," 7 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'troposphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of troposphere

1908, in the meaning defined above

History and Etymology for troposphere

International Scientific Vocabulary

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Time Traveler for troposphere

Time Traveler

The first known use of troposphere was in 1908

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Statistics for troposphere

Last Updated

5 Feb 2020

Cite this Entry

“Troposphere.” Dictionary, Merriam-Webster, Accessed 29 Feb. 2020.

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Rhyming Dictionary: Words that rhyme with troposphere Encyclopedia article about troposphere

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