Properties and Processing of Aviation Exhaust Aerosol at Cruise Altitude Observed from the IAGOS-CARIBIC Flying Laboratory

• DOI: 10.1021/acs.est.3c09728
• Publication Date: 2024-04-08T19:11:38Z
• Authors: Christoph Mahnke; Rita Gomes; Ulrich Bundke; Marcel Berg; Helmut Ziereis; Monica Sharma; Mattia Righi; Johannes Hendricks; Andreas Zahn; Andreas Wahner; Andreas Petzold
• Keywords: Tropopause; Panache

The characteristics of aviation-induced aerosol, its processing, and effects on cirrus clouds climate are still associated with large uncertainties. Properties however, crucially needed for the assessment aviation's impacts today in future. We identified more than 1100 aircraft plume encounters during passenger flights IAGOS-CARIBIC Flying Laboratory from July 2018 to March 2020. aerosol properties inside plumes were similar, independent altitude (i.e., upper troposphere, tropopause region, lowermost stratosphere). exhaust was found be mostly externally mixed compared internally background even at a age 1 3 h. No enhancement accumulation mode particles (diameter >250 nm) could detected plumes. Particle number emission indices (EIs) deduced observations aged same range as values reported engine certifications. This finding, together observed external mixing state plumes, indicates that aviation almost remains expansion. It also reveals particle EIs used global models within measured