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DOI	10.5194/acp-21-3899-2021
	The seasonal cycle of ice-nucleating particles linked to the abundance of biogenic aerosol in boreal forests
	Schneider J.; Höhler K.; Heikkilä P.; Keskinen J.; Bertozzi B.; Bogert P.; Schorr T.; Silas Umo N.; Vogel F.; Brasseur Z.; Wu Y.; Hakala S.; Duplissy J.; Moisseev D.; Kulmala M.; Adams M.P.; Murray B.J.; Korhonen K.; Hao L.; Thomson E.S.; Castarède D.; Leisner T.; Petäjä T.; Möhler O.
发表日期	2021
ISSN	1680-7316
起始页码	3899
结束页码	3918
卷号	21 期号:5
英文摘要	Ice-nucleating particles (INPs) trigger the formation of cloud ice crystals in the atmosphere. Therefore, they strongly influence cloud microphysical and optical properties and precipitation and the life cycle of clouds. Improving weather forecasting and climate projection requires an appropriate formulation of atmospheric INP concentrations. This remains challenging as the global INP distribution and variability depend on a variety of aerosol types and sources, and neither their short-Term variability nor their long-Term seasonal cycles are well covered by continuous measurements. Here, we provide the first year-long set of observations with a pronounced INP seasonal cycle in a boreal forest environment. Besides the observed seasonal cycle in INP concentrations with a minimum in wintertime and maxima in early and late summer, we also provide indications for a seasonal variation in the prevalent INP type. We show that the seasonal dependency of INP concentrations and prevalent INP types is most likely driven by the abundance of biogenic aerosol. As current parameterizations do not reproduce this variability, we suggest a new mechanistic description for boreal forest environments which considers the seasonal variation in INP concentrations. For this, we use the ambient air temperature measured close to the ground at 4.2 m height as a proxy for the season, which appears to affect the source strength of biogenic emissions and, thus, the INP abundance over the boreal forest. Furthermore, we provide new INP parameterizations based on the Ice Nucleation Active Surface Site (INAS) approach, which specifically describes the ice nucleation activity of boreal aerosols particles prevalent in different seasons. Our results characterize the boreal forest as an important but variable INP source and provide new perspectives to describe these new findings in atmospheric models. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol; air temperature; ambient air; boreal forest; cloud microphysics; ice crystal; seasonal variation
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/247062
作者单位	Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany; Aerosol Physics Laboratory, Physics Unit, Faculty of Engineering and Natural Sciences, Tampere University, Tampere, Finland; Institute for Atmospheric and Earth System Research, Faculty of Science, University of Helsinki, Helsinki, Finland; Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Applied Physics, University of Eastern Finland, Kuopio, Finland; Atmospheric Science, Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden; Helsinki Institute of Physics, University of Helsinki, Helsinki, Finland
推荐引用方式 GB/T 7714	Schneider J.,Höhler K.,Heikkilä P.,et al. The seasonal cycle of ice-nucleating particles linked to the abundance of biogenic aerosol in boreal forests[J],2021,21(5).
APA	Schneider J..,Höhler K..,Heikkilä P..,Keskinen J..,Bertozzi B..,...&Möhler O..(2021).The seasonal cycle of ice-nucleating particles linked to the abundance of biogenic aerosol in boreal forests.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	Schneider J.,et al."The seasonal cycle of ice-nucleating particles linked to the abundance of biogenic aerosol in boreal forests".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).