Springtime Aerosol Mixing State at the Oliktok Point AMF3 Site
Authors
Andrew Phillip Ault — University of Michigan
Rachel Kirpes — University of Michigan
Kerri Pratt — University of Michigan
Jessie Creamean — Colorado State University
Category
High-latitude clouds and aerosols
Description
Despite rapid change occurring in the Arctic, little is known about the atmospheric aerosol chemical composition and mixing state in the region. The mixing state of aerosols defines their climate effects, including interactions with radiation (scattering/absorption) and formation of cloud droplets and ice crystals. Atmospheric particle sampling was conducted during the ‘Sources of Ice Nucleating Particles at Oliktok Point’ ARM field campaign from March-May 2017. Subsequent offline individual particle measurements include computer-controlled scanning electron microscopy with energy-dispersive X-ray analysis, Raman microspectroscopy, and atomic force microscopy with infrared spectroscopy (AFM-IR). Preliminary analysis shows that partially aged sea spray aerosol, organic aerosol, mineral dust, and fly ash were the most prevalent individual particle types. Determination of individual particle mixing state informs interpretation of concurrent measurements of ice nucleating particle concentrations, providing a link between aerosol chemical composition and cloud nucleation properties.
