Global impact of anthropogenic NH 3 emissions on upper tropospheric aerosol formation - Christos Xenofontos; Matthias Kohl; Samuel Ruhl; João Almeida; Lucía Caudillo-Plath; Romulo Cruz-Simbron; Lubna Dada; Jonathan Duplissy; Sebastian Ehrhart; Henning Finkenzeller; Kristina Höhler; Weimeng Kong; et al. (Proceedings of the National Academy of Sciences, 2025)