Ice Nucleating Particle Concentrations Increase When Leaves Fall in Autumn

Atmosphere

Franz Conen¹  Mikhail V. Yakutin²  Christoph Hüglin³  Karl Espen Yttri⁴ 

[1] Department of Environmental Sciences, University of Basel, 4056 Basel, Switzerland;Institute of Soil Science and Agrochemistry, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia;Laboratory for Air Pollution/Environmental Technology, Swiss Federal Laboratories for Materials Science and Technology (Empa), 8600 Dübendorf, Switzerland;NILU—Norwegian Institute for Air Research, 2027 Kjeller, Norway;

关键词: biological particles;    seasonal pattern;    land-atmosphere interactions;   

DOI  :  10.3390/atmos8100202

来源: DOAJ

【 摘 要 】

Ice nucleating particles active at −8 °C or warmer (INP−8) are produced by plants and by microorganisms living from and on them. Laboratory studies have shown that large numbers of INP−8 are produced by decaying leaves. At three widely dispersed locations in Northwestern Eurasia, we saw, from an analysis of PM10 filter samples, that seasonal median concentrations of INP−8 in the boundary layer doubled from summer to autumn. Concentrations of INP−8 increased in autumn soon after the normalized differential vegetation index had started to decrease. Whether the large-scale phenological event of leaf senescence and shedding in autumn has an impact on ice formation in clouds is a justified question.

【 授权许可】

Unknown