INCITAP   20787
INSTITUTO DE CIENCIAS DE LA TIERRA Y AMBIENTALES DE LA PAMPA
Unidad Ejecutora - UE
artículos
Título:
Ice nucleation activity of agricultural soil dust aerosols from Mongolia, Argentina and Germany
Autor/es:
ISABELLE STEINKE; LAURA ANTONELA ITURRI; ROGER FUNK; OTTMAR MÖHLER; SILKE KIRCHEN; BERKO SIERAU; THOMAS SCHWARTZ; ANDREAS ULRICH ; EMRE TOPRAK ; CORINNA HOOSE; JACQUELINE BUSS; MARTIN LEUE ; MARTIN SCHNAITE; ROMY ULLRICH ; THOMAS LEISNER
Revista:
JOURNAL OF GEOPHYSICAL RESEARCH
Editorial:
AMER GEOPHYSICAL UNION
Referencias:
Año: 2016
ISSN:
0148-0227
Resumen:
Soil dust particles emitted from agricultural areas contain considerable mass fractions of organic material. Also, soil dust particles may act as carriers for potentially ice-active biological particles. In this work, we present ice nucleation experiments conducted in the AIDA cloud chamber. We investigated the ice nucleation efficiency of four types of soil dust from different regions of the world. The results are expressed as ice nucleation active surface site (INAS) densities and presented for the immersion freezing and the deposition nucleation mode. For immersion freezing occurring at 254 K, samples from Argentina, China and Germany show ice nucleation efficiencies which are by a factor 10 higher than desert dusts. On average, the difference in ice nucleation efficiencies between agricultural and desert dusts becomes significantly smaller at temperatures below 247 K. In the deposition mode the soil dusts showed higher ice nucleation activity than Arizona Test Dust over a temperature range between 232 and 248 K, and humidities RHice up to 125%. INAS densities varied between 109 and 1011 m-2 for these thermodynamic conditions. For one soil dust sample (Argentinian Soil), the effect of treatments with heat was investigated. Heat treatments (383 K) did not affect the ice nucleation efficiency observed at 249 K. This finding presumably excludes proteinaceous ice nucleating entities as the only source of the increased ice nucleation efficiency.