气候变化领域集成服务门户(CCPortal): Long-term sub-micrometer aerosol chemical composition in the boreal forest: Inter- And intra-annual variability

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DOI	10.5194/acp-20-3151-2020
	Long-term sub-micrometer aerosol chemical composition in the boreal forest: Inter- And intra-annual variability
	Heikkinen L.; Äijälä M.; Riva M.; Luoma K.; Dällenbach K.; Aalto J.; Aalto P.; Aliaga D.; Aurela M.; Keskinen H.; Makkonen U.; Rantala P.; Kulmala M.; Petäjä T.; Worsnop D.; Ehn M.
发表日期	2020
ISSN	1680-7316
起始页码	3151
结束页码	3180
卷号	20 期号:5
英文摘要	The Station for Measuring Ecosystem-Atmosphere Relations (SMEAR) II is well known among atmospheric scientists due to the immense amount of observational data it provides of the Earth-atmosphere interface. Moreover, SMEAR II plays an important role for the large European research infrastructure, enabling the large scientific community to tackle climate- and air-pollution-related questions, utilizing the high-quality long-term data sets recorded at the site. So far, this well-documented site was missing the description of the seasonal variation in aerosol chemical composition, which helps understanding the complex biogeochemical and physical processes governing the forest ecosystem. Here, we report the sub-micrometer aerosol chemical composition and its variability, employing data measured between 2012 and 2018 using an Aerosol Chemical Speciation Monitor (ACSM). We observed a bimodal seasonal trend in the sub-micrometer aerosol concentration culminating in February (2.7, 1.6, and 5.1 μg m-3 for the median, 25th, and 75th percentiles, respectively) and July (4.2, 2.2, and 5.7 μg m-3 for the median, 25th, and 75th percentiles, respectively). The wintertime maximum was linked to an enhanced presence of inorganic aerosol species (ca. 50 %), whereas the summertime maximum (ca. 80 % organics) was linked to biogenic secondary organic aerosol (SOA) formation. During the exceptionally hot months of July of 2014 and 2018, the organic aerosol concentrations were up to 70 % higher than the 7-year July mean. The projected increase in heat wave frequency over Finland will most likely influence the loading and chemical composition of aerosol particles in the future. Our findings suggest strong influence of meteorological conditions such as radiation, ambient temperature, and wind speed and direction on aerosol chemical composition. To our understanding, this is the longest time series reported describing the aerosol chemical composition measured online in the boreal region, but the continuous monitoring will also be maintained in the future. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	aerosol composition; annual variation; biogeochemical cycle; boreal forest; concentration (composition); forest ecosystem; seasonal variation; trend analysis
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/247918
作者单位	Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland; Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, Villeurbanne, 69626, France; Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, 00014, Finland; Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, 00101, Finland; Aerodyne Research Inc., Billerica, MA, United States
推荐引用方式 GB/T 7714	Heikkinen L.,Äijälä M.,Riva M.,et al. Long-term sub-micrometer aerosol chemical composition in the boreal forest: Inter- And intra-annual variability[J],2020,20(5).
APA	Heikkinen L..,Äijälä M..,Riva M..,Luoma K..,Dällenbach K..,...&Ehn M..(2020).Long-term sub-micrometer aerosol chemical composition in the boreal forest: Inter- And intra-annual variability.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(5).
MLA	Heikkinen L.,et al."Long-term sub-micrometer aerosol chemical composition in the boreal forest: Inter- And intra-annual variability".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.5(2020).