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CONTRAILCondensation Trail
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Of these three, the first was the most important from the standpoint of military operations, since this type of condensation trail was "consistently encountered" at high altitudes.
Furthermore, his report offers convincing evidence that Nead saw condensation trails over the Argonne region and not smoke trails.
"In conclusion, no solid evidence was found that would link condensation trails observed in the atmosphere to any other causes and/or phenomena other that those cited above," the government report stated.
the reduction of long-lived GHG emissions, such as CO2, is essential, but lower levels of short-lived GHG emissions (heavy aerosols, tropospheric ozone, jet condensation trails) could also make a major contribution.
I don't dispute that cars pose a threat to the environment, but planes pose a much greater one because a) their exhaust fumes are emitted at high altitude, where they create a blanket of translucent smog which reflects heat back to the earth, b) hot moist air from the engines helps form condensation trails which add to global warming and c) the burning of kerosene in aircraft engines helps to form cirrus clouds which also adds to it.
The 95,000 gas turbine engines that currently power the world's commercial aircrafts represent about 3% of the emitted C[O.sub.2], not accounting for the impact of Nitrogen Oxides as well as the condensation trails. In order to reduce the C[O.sub.2] emission of aircraft engines, we would need to improve the efficiency of turbomachinery components.
The researchers will examine the effects of condensation trails, nitrogen dioxide and other aircraft emissions.
Aircraft also spew water vapor at high altitude that forms condensation trails or "contrails," which are visible cloud lines that are common in cold, humid atmospheres.
Briefly, the implications of such developments and their direct impact on the aviation sector could include congested skies over, and in the vicinity of, airports; a mismatch between air and ground infrastructure capacity; climatic change due to emissions, water vapour and the phenomenon of condensation trails; local air quality leading to health and environmental impacts; water and soil pollution; aircraft noise; safety risks in terms of accidents; congestion of runway slots, barrier effects both for the environment and local communities on wild life, habitats and bio-diversity, loss of countryside, landscape, heritage; and indirect impact on land use, energy production, supply chains and waste disposal, plus surface transport to and from airports, and parking.
Condensation trails, which are also known as contrails, are formed when airplanes fly at high altitudes, where the air is extremely cold.
Just one year ago, for the better part of a week, I was able to look up into the sky for the first time in my life and not see a single aircraft or the condensation trails that some aircraft leave behind, Also, missing was the engine noise that always accompanies these aircraft.
The scientists also analyzed the makeup of condensation trails, or contrails, those long, straight clouds often created by jets.