To the scientifically uninitiated, it might seem like a frivolous idea: That those slight, wispy clouds that trail behind jet aircraft at such high altitudes could contribute to climate change. But they do.
Scientists love to measure things, and when they measured these contrails, which is short for condensation trails, they found bad news. Though they look kind of beautiful and ephemeral on a summer day, they pack an oversize punch when it comes to their warming effect.
A new study from the German Institute for Atmospheric Physics looked at the cirrus clouds that form when the moisture in the jet engine exhaust freezes into ice crystals. They found that these clouds, which can sometimes persist for hours, account for more climate warming than the carbon in the exhaust. The effect is called Contrail Cirrus Radiative Forcing.
The study is called “Contrail cirrus radiative forcing for future air traffic” and the authors are Lisa Bock and Ulrike Burkhardt. The study was published on June 27 in Atmospheric Chemistry and Physics, a journal of the European Geosciences Union. It focused in on the expected growth in air travel between 2006 and 2050. They say that contrail cirrus radiative forcing (hereafter called CCRF) is projected to increase by a factor of three by the year 2050.
Jet engine exhaust contains water vapour, along with other substances, including carbon dioxide, sulfur oxide, nitrogen oxide, and unburned fuel. It also contains metal particles and soot particles, and they act as condensation
Article source: https://www.universetoday.com/142729/airplane-contrails-are-contributing-to-global-warming-too/
BLACK RIVER, NY — Freeman John Fohr, 76, of 29758 Burnup Road, Black River, passed away July 1, 2019, at the home of his daughter and son-in-law in Henderson where he was under the care of Hospice of Jefferson County.