Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site

• DOI: 10.1002/2016jd024894
• Publication Date: 2016-09-26T13:05:21Z
• Authors: Piotr Kupiszewski; Marco Zanatta; Stephan Mertes; Paul Vochezer; Gary Lloyd; Johannes Schneider; Ludwig Schenk; Martin Schnaiter; Urs Baltensperger; Ernest Weingartner; Martin Gysel
• Keywords: Ice nucleus; Particle (ecology)

Ice residual (IR) and total aerosol properties were measured in mixed-phase clouds (MPCs) at the high-alpine Jungfraujoch research station. Black carbon (BC) content coating thickness of BC-containing particles determined using single-particle soot photometers. The ice activated fraction (IAF), derived from a comparison IR particle size distributions, showed an enrichment large IR, with increase IAF values on order 10-4 to 10-3 for 100 nm (diameter) 0.2 0.3 1 μm particles. Nonetheless, due high number submicrometer respect number, distributions still dominated by aerosol. A simultaneously BC-free depletion BC suggesting that does not play significant role nucleation MPCs Jungfraujoch. potential anthropogenic climate impact via glaciation effect is therefore likely be negligible this site environments similar meteorological conditions population. also increased size, manner as particles, but level magnitude lower. Furthermore, found have thicker than aerosol, importance atmospheric aging nucleation.