Contrails, the lines of clouds left by high-flying aircraft that crisscross the skies, are familiar sights, but they may have an unseen effect on the planet –
NASA Armstrong’s DC-8 aircraft flies over the northwestern U.S. to monitor emissions from Boeing’s ecoDemonstrator Explorer aircraft. As the largest flying science laboratory in the world, the DC-8 is equipped to collect crucial data about the sustainable aviation fuel and its effects on condensation trail formation. trapping heat in the atmosphere.
Boeing’s current ecoDemonstrator Explorer aircraft, a 737-10, has conducted test flights switching between tanks filled either with 100% sustainable aviation fuel or conventional fuel. NASA’s DC-8 aircraft, the world’s largest flying science laboratory, has followed, measuring emissions and contrail ice formation from each type of fuel. This data will help determine whether sustainable aviation fuels help reduce the formation of contrails.
Contrail clouds form when aircraft operate in the cold temperatures at high altitudes and water vapor in engine exhaust condenses and freezes. Made up of ice particles, contrail clouds can have both a cooling and warming effect based on ambient conditions, timing, and persistence – but scientists estimate that their warming effect is greater on a global scale.
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