As one rises in the atmosphere, normally ( except in the case of a thermal inversion ) the temperature decreases, at a rate called the lapse rate.
22.
Usually the restrictions come during the winter months between November and March when thermal inversions trap dirty air within the arc of mountains that circle the city below.
23.
Thermal inversions reached such dangerous levels at various times in the mid-1990s that the government declared pollution emergencies, necessitating sharp temporary cutbacks in vehicle use and industrial production.
24.
Fuel burns less efficiently at high altitude, and thermal inversions mean that the surrounding mountains trap a layer of cold air above the city, preventing the dispersal of fumes.
25.
Smog can be at its worst during a thermal inversion, when the temperature of the atmosphere increases with altitude, creating a layer of stable air that traps the dirty air underneath.
26.
Palazuelos attributed the persistent smog to thermal inversions which occurred Friday, a phenomenon in which a blanket of cold air clogs up the mountain valley and traps pollution close to the ground.
27.
To generate the Fata Morgana phenomenon, the thermal inversion has to be strong enough that the curvature of the light rays within the inversion layer is stronger than the curvature of the Earth.
28.
When the ground is colder than the air above it ( thermal inversion ), black ice or freezing rain can occur . ~ U ) 02 : 17, 18 January 2011 ( UTC)
29.
The plain is subject to a phenomenon of thermal inversion, especially marked in calm weather days during the fall and the winter, by which the surrounding mountain ranges are often warmer than the plain.
30.
At that point in time, the air was cooler while the ocean was probably a little bit warmer, which caused the thermal inversion to be not as extreme as it was few hours before.
