Do airplane contrails add to climate change? Yes, and the problem is about to get worse. - NBCNewsMACH
“Some days there aren’t contrails forming, some days they’re short-lived, and other days they’re long-lasting and soon covering the whole sky,” Burkhardt says.
The new research may overstate the climate-warming effect of contrails by treating them all like heat-trapping cirrus clouds, says Judith Rosenow, an aeronautical meteorologist at the Dresden University of Technology in Germany, who was not involved in the study. Another way scientists study contrails is by having chase planes fly behind a test aircraft and measure the amount of soot being produced by its engines. Using these flights, researchers have been testing whether contrails can be reduced by switching jets to biofuels made from plants, fat, oil and grease rather than the standard kerosene-based jet fuel that has long been the mainstay of commercial aviation.
During their recent study, Burkhardt and her colleague Lisa Bock at the German Aerospace Center ran a simulation that found biofuel blends for jet fuel could reduce the estimated warming effect of contrails by 14 percent through 2050. But that alone would not be enough to offset the climate impact.where contrails are most likely to form — a challenge when such regions frequently change in size, shape and location.
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