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The Influence of Chemical and Mineral Compositions on the Parameterization of Immersion Freezing by Volcanic Ash Particles
Author(s) -
Umo N. S.,
Ullrich R.,
Maters E. C.,
Steinke I.,
Benker N.,
Höhler K.,
Wagner R.,
Weidler P. G.,
Hoshyaripour G. A.,
Kiselev A.,
Kueppers U.,
Kandler K.,
Dingwell D. B.,
Leisner T.,
Möhler O.
Publication year - 2021
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2020jd033356
Subject(s) - ice nucleus , aerosol , nucleation , plagioclase , atmospheric sciences , volcanic ash , volcano , mineralogy , ice crystals , explosive eruption , precipitation , geology , environmental science , materials science , meteorology , chemistry , geochemistry , magma , physics , composite material , quartz , organic chemistry
Volcanic ash (VA) from explosive eruptions contributes to aerosol loadings in the atmosphere. Aside from the negative impact of VA on air quality and aviation, these particles can alter the optical and microphysical properties of clouds by triggering ice formation, thereby influencing precipitation and climate. Depending on the volcano and eruption style, VA displays a wide range of different physical, chemical, and mineralogical properties. Here, we present a unique data set on the ice nucleation activity of 15 VA samples obtained from different volcanoes worldwide. The ice nucleation activities of these samples were studied in the Aerosol Interaction and Dynamics in the Atmosphere (AIDA) cloud simulation chamber as well as with the Ice Nucleation Spectrometer of the Karlsruhe Institute of Technology (INSEKT). All VA particles nucleated ice in the immersion freezing mode from 263 to 238K with ice nucleation active site (INAS) densities ranging from ∼10 5 to 10 11 m −2 , respectively. The variabilities observed among the VA samples, at any given temperature, range over 3.5 orders of magnitude. The ice‐nucleating abilities of VA samples correlate to varying degrees with their bulk pyroxene and plagioclase contents as a function of temperature. We combined our new data set with existing literature data to develop an improved ice nucleation parameterization for natural VA in the immersion freezing mode. This should be useful for modeling the impact of VA on clouds.