DOI: 10.1016/j.atmosenv.2013.12.046
Scopus记录号: 2-s2.0-84894096924
论文题名: Activity size distribution and residence time of 7Be aerosols in the Arctic atmosphere
作者: Ioannidou A ; , Paatero J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 88 起始页码: 99
结束页码: 106
语种: 英语
英文关键词: Activity size distribution
; AMAD
; Beryllium-7
; Radioactive aerosols
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The activity size distributions of the natural radionuclide tracer 7Be in different size range fractions (<0.39μm, 0.39-0.69μm, 0.69-1.3μm, 1.3-2.1μm, 2.1-4.2μm, 4.2-10.2μm and >10.2μm) were determined in the boreal atmosphere in the Arctic Research Centre of the Finnish Meteorological Institute (FMI) at Sodankylä, Finland (67°22' N, 26°38' E, 180masl). The activity median aerodynamic diameter (AMAD) ranged from 0.54μm to 1.05μm (average 0.83μm). A residence time of about 8 days applies to aerosols of 0.83μm diameter, representing the residence of aerosol particles in arctic environment. The observed positive correlation between AMAD values and RH% can be explained by the fact that condensation during high relative humidity conditions becomes more intense, resulting in increased particle sizes of atmospheric aerosols. However, greater aerosol particle sizes means higher wet scavenging rate of aerosols and as a result lower activity concentration of 7Be in the atmosphere, explaining the anti-correlation between the AMAD values and activity concentrations of 7Be. But this associated with possibly higher scavenging rates of aerosols does not necessarily alone explain the anti-correlation between the AMAD and the 7Be activities. The air mass origin associated with synoptic scale weather phenomena may contribute to that too. The Flextra model was used to assess the transport pattern and to explain the deviation in radionuclide activity concentrations and AMAD values observed in the site of investigation. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80695
Appears in Collections: 气候变化事实与影响
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作者单位: Aristotle University of Thessaloniki, Physics Department, Nuclear Physics Laboratory, Thessaloniki 54124, Greece; Finnish Meteorological Institute (FMI), Observation Services, P.O. Box 503, Helsinki FI-00101, Finland
Recommended Citation:
Ioannidou A,, Paatero J. Activity size distribution and residence time of 7Be aerosols in the Arctic atmosphere[J]. Atmospheric Environment,2014-01-01,88