期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 121, 期 20, 页码 12343-12362出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JD024894
关键词
heterogeneous ice nucleation; mixed-phase clouds; black carbon; ice residuals
资金
- Swiss National Science Foundation [135356]
- DFG priority program HALO (SPP1294) [ME3534/1-2]
- DFG research unit INUIT [FOR1525, STR453/7-1, SCHN1138/2-1]
- DFG [SCHN1140/2-1]
- MeteoSwiss (GAW-CH program)
- European Research Council [615922-BLACARAT]
- ACTRIS program (European Union) [262254]
- BACCHUS project (European Union) [603445]
Ice residual (IR) and total aerosol properties were measured in mixed-phase clouds (MPCs) at the high-alpine Jungfraujoch research station. Black carbon (BC) content and coating thickness of BC-containing particles were determined using single-particle soot photometers. The ice activated fraction (IAF), derived from a comparison of IR and total aerosol particle size distributions, showed an enrichment of large particles in the IR, with an increase in the IAF from values on the order of 10(-4) to 10(-3) for 100nm (diameter) particles to 0.2 to 0.3 for 1m (diameter) particles. Nonetheless, due to the high number fraction of submicrometer particles with respect to total particle number, IR size distributions were still dominated by the submicrometer aerosol. A comparison of simultaneously measured number size distributions of BC-free and BC-containing IR and total aerosol particles showed depletion of BC by number in the IR, suggesting that BC does not play a significant role in ice nucleation in MPCs at the Jungfraujoch. The potential anthropogenic climate impact of BC via the glaciation effect in MPCs is therefore likely to be negligible at this site and in environments with similar meteorological conditions and a similar aerosol population. The IAF of the BC-containing particles also increased with total particle size, in a similar manner as for the BC-free particles, but on a level 1 order of magnitude lower. Furthermore, BC-containing IR were found to have a thicker coating than the BC-containing total aerosol, suggesting the importance of atmospheric aging for ice nucleation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据