1Institut für Physik der Atmosphäre, DLR Oberpfaffenhofen, Germany
2Institut für Chemie und Dynamik der Geosphäre, FZ Jülich, Jülich, Germany
3Institut für Physik der Atmosphäre, Universität Mainz, Mainz, Germany
4Max-Planck-Institut für Chemie, Abteilung Wolkenphysik, Mainz, Germany
5Observatory of Neuchâtel, Neuchâtel, Switzerland
Abstract. Measurements in nascent ice forming regions are very rare and help understand cirrus cloud formation and the interactions of trace gases with ice crystals. A cirrus cloud has very likely been probed in its formation stage with in-situ and remote sensing instruments onboard the high altitude research aircraft Geophysica M55 in the tropical upper troposphere. Besides microphysical and optical particle properties, water (H2O) and nitric acid (HNO3) have been measured. In slightly ice supersaturated air between 14.2 and 15 km altitude, an unusually low ice water content of 0.026 mg m–3 and small ice crystals with mean radii of 5 μm have been detected. A high HNO3/H2O molar ratio in ice of 5×10–5 has been observed in this region, about an order of magnitude higher compared to previous observations in cirrus at similar temperatures (near 202 K). A model describing the trapping of HNO3 in growing ice particles shows that a high HNO3 content in ice crystals is expected during early growth stages, mainly originating from uptake in aerosol particles prior to freezing. Water vapor deposition on ice crystals and trapping of additional HNO3 reduces the molar ratio to values close to the ratio of HNO3/H2O in the gas phase while the cloud ages.