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Potential pre-industrial-like new particle formation induced by pure biogenic organic vapors in Finnish peatland. 2024
Wei Huang, and
Heikki Junninen, and
Olga Garmash, and
Katrianne Lehtipalo, and
Dominik Stolzenburg, and
Janne L P Lampilahti, and
Ekaterina Ezhova, and
Simon Schallhart, and
Pekka Rantala, and
Diego Aliaga, and
Lauri Ahonen, and
Juha Sulo, and
Lauriane L J Quéléver, and
Runlong Cai, and
Pavel Alekseychik, and
Stephany B Mazon, and
Lei Yao, and
Sara M Blichner, and
Qiaozhi Zha, and
Ivan Mammarella, and
Jasper Kirkby, and
Veli-Matti Kerminen, and
Douglas R Worsnop, and
Markku Kulmala, and
Federico Bianchi
Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland.
Pure biogenic new particle formation (NPF) induced by highly oxygenated organic molecules (HOMs) could be an important mechanism for pre-industrial aerosol formation. However, it has not been unambiguously confirmed in the ambient due to the scarcity of truly pristine continental locations in the present-day atmosphere or the lack of chemical characterization of NPF precursors. Here, we report ambient observations of pure biogenic HOM-driven NPF over a peatland in southern Finland. Meteorological decoupling processes formed an "air pocket" (i.e., a very shallow surface layer) at night and favored NPF initiated entirely by biogenic HOM from this peatland, whose atmospheric environment closely resembles that of the pre-industrial era. Our study sheds light on pre-industrial aerosol formation, which represents the baseline for estimating the impact of present and future aerosol on climate, as well as on future NPF, the features of which may revert toward pre-industrial-like conditions due to air pollution mitigation.
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