气候变化领域集成服务门户(CCPortal): Size-dependent ice nucleation by airborne particles during dust events in the eastern Mediterranean

CCPortal

DOI	10.5194/acp-19-11143-2019
	Size-dependent ice nucleation by airborne particles during dust events in the eastern Mediterranean
	Reicher N.; Budke C.; Eickhoff L.; Raveh-Rubin S.; Kaplan-Ashiri I.; Koop T.; Rudich Y.
发表日期	2019
ISSN	16807316
起始页码	11143
结束页码	11158
卷号	19 期号:17
英文摘要	The prediction of cloud ice formation in climate models remains a challenge, partly due to the complexity of ice-related processes. Mineral dust is a prominent aerosol in the troposphere and is an important contributor to ice nucleation in mixed-phase clouds, as dust can initiate ice heterogeneously at relatively low supercooling conditions. We characterized the ice nucleation properties of size-segregated mineral dust sampled during dust events in the eastern Mediterranean. The sampling site allowed us to compare the properties of airborne dust from several sources with diverse mineralogy that passed over different atmospheric paths. We focused on particles with six size classes determined by the Micro-Orifice Uniform Deposit Impactor (MOUDI) cutoff sizes: 5.6, 3.2, 1.8, 1.0, 0.6 and 0.3 μm. Ice nucleation experiments were conducted in theWeizmann Supercooled Droplets Observation on a Microarray (WISDOM) setup, whereby the particles are immersed in nanoliter droplets using a microfluidics technique. We observed that the activity of airborne particles depended on their size class; supermicron and submicron particles had different activities, possibly due to different composition. The concentrations of ice-nucleating particles and the density of active sites (ns) increased with the particle size and particle concentration. The supermicron particles in different dust events showed similar activity, which may indicate that freezing was dominated by common mineralogical components. Combining recent data of airborne mineral dust, we show that current predictions, which are based on surface-sampled natural dust or standard mineral dust, overestimate the activity of airborne dust, especially for the submicron class. Therefore, we suggest including information on particle size in order to increase the accuracy of ice formation modeling and thus weather and climate predictions. © Author(s) 2019.
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144177
作者单位	Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, 76100, Israel; Faculty of Chemistry, Bielefeld University, Universitätsstraße 25, Bielefeld, 33615, Germany; Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100, Israel
推荐引用方式 GB/T 7714	Reicher N.,Budke C.,Eickhoff L.,et al. Size-dependent ice nucleation by airborne particles during dust events in the eastern Mediterranean[J],2019,19(17).
APA	Reicher N..,Budke C..,Eickhoff L..,Raveh-Rubin S..,Kaplan-Ashiri I..,...&Rudich Y..(2019).Size-dependent ice nucleation by airborne particles during dust events in the eastern Mediterranean.Atmospheric Chemistry and Physics,19(17).
MLA	Reicher N.,et al."Size-dependent ice nucleation by airborne particles during dust events in the eastern Mediterranean".Atmospheric Chemistry and Physics 19.17(2019).