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Related to tropopause: stratosphere


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[Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other planets and satellites are known, only the earth's atmosphere has been well studied, the science of
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the boundary between the troposphere and the stratosphere. The thickness of the tropopause ranges from a few hundred meters to 2–3 km. In the tropopause the lapse rate decreases, and temperature inversions are frequently observed. The height of the upper boundary of the troposphere is usually taken as the height of the tropopause. The height of the tropopause depends on geographic latitude, and the tropopause is higher in summer than in winter. Moreover, the height of the tropopause also depends on cyclonic activity; that is, the tropopause is lower in cyclones and higher in anticyclones. Over certain regions the tropopause often breaks up and then reforms; in the subtropics, breaks in the tropopause are regularly observed as we move from temperate to tropical latitudes. These breaks are associated with powerful subtropical jet streams.


The boundary between the troposphere and stratosphere, usually characterized by an abrupt change of lapse rate; the change is in the direction of increased atmospheric stability from regions below to regions above the tropopause; its height varies from 9 to 12 miles (15 to 20 kilometers) in the tropics to about 6 miles (10 kilometers) in polar regions.


The boundary region at the top of the troposphere. In this atmospheric layer, an increase in altitude is not accompanied by a corresponding decrease in temperature. It is the coldest level in the atmosphere. The height of the tropopause is not constant at all latitudes. Over the equatorial regions, it is located around the 50,000-ft level, whereas over the poles it is only about 25,000 ft high. In the middle latitudes, it is encountered at about 35,000 ft. In the tropopause, the temperature is colder over the equator than over the poles.
References in periodicals archive ?
Predictions of stratospheric humidity changes are uncertain because of gaps in the understanding of the physical processes occurring in the tropical tropopause layer.
Many studies have demonstrated they are mainly caused by dynamical process by transport of poorozone air mass from the tropics to higher latitudes by planetary wave activity or, connected with strong adiabatic uplifting of the tropopause height.
To explain the rest, the researchers suggest that the tropopause over the tropics may have warmed, allowing more water vapor to sneak from the lower atmosphere into the stratosphere.
By "toasty" we mean perhaps -50 degrees C while the tropopause underneath is a frigid -80, which is a big difference considering things like potential temperature and adiabatic cooling.
Pogosyan, advection of tropospheric air through gaps of tropopause, located above subtropical jet currents plays the main role in this process [4].
NASA DEPLOYS ATTREX: NASA is deploying the uncrewed Global Hawk research aircraft to Guam for the Airborne Tropical Tropopause Experiment (ATTREX).
The winds also pose a problem at high altitudes, where low temperatures 6 between -70 and -50 degrees Fahrenheit at an atmospheric layer called the tropopause -- can make the balloon brittle, meaning a sudden gust could rupture its thin surface.
These are the guys towering up to the tropopause (about 60,000 feet) and a little above, with an "anvil" trailing downwind.
Low cumulus clouds rapidly grow in vertical extent until they reach the tropopause and then shrink--presumably as they dump a methane-ethane rain onto Titan's surface.
These "trails probably could have been made to cease at any elevation below the tropopause by throttling the engines in accordance with rule 1 or 2 governing the suppression of exhaust trails.
His experiences, which he regales us with on page 14 include sampling hurricane-force winds strapped inside a wind-tunnel, flying to the tropopause to experience the jet stream, and feeling the full force of dam waters being unleashed on his head.