|Richard Assmann, Léon Teisserenc de Bort atmospheric sciences
Unmanned high-altitude hydrogen balloons hoisting scientific instruments to record pressure, temperature, humidity, and winds Richard Assmann and Léon Teisserenc de Bort separately released hundreds of such balloons and discovered that the lapse rate of temperature stopped decreasing with height at 39,000 feet up, and began to increase, marking the tropopause, where the stratosphere begins.
In the stratosphere, cooler layers lie closer to the earth. Cold temperatures of the lower stratosphere freeze-dry air rising from the troposphere. Ozone in upper levels stratosphere absorbs ultraviolet radiation from the sun. Stratification of temperatures results in little vertical convection. Commercial aircraft fly above the tropopause in the lower stratosphere. Few birds fly so high but bacteria survive in the stratosphere.
Living in the sky
Living in the sky with my feet on the ground, I can’t help breathing air of the troposphere. Altitude gives me airs where gases are rarefied. An atmospheric wind blows hair in my ears.