Mass spectrometric measurements of ambient ions and estimation of gaseous sulfuric acid in the free troposphere and lowermost stratosphere during the CAFE-EU/BLUESKY campaign - Zauner-Wieczorek, Marcel; Heinritzi, Martin; Granzin, Manuel; Keber, Timo; Kürten, Andreas; Kaiser, Katharina; Schneider, Johannes; Curtius, Joachim (2022)