Huang Wei, Junninen Heikki, Garmash Olga, Lehtipalo Katrianne, Stolzenburg Dominik, Lampilahti Janne L P, Ezhova Ekaterina, Schallhart Simon, Rantala Pekka, Aliaga Diego, Ahonen Lauri, Sulo Juha, Quéléver Lauriane L J, Cai Runlong, Alekseychik Pavel, Mazon Stephany B, Yao Lei, Blichner Sara M, Zha Qiaozhi, Mammarella Ivan, Kirkby Jasper, Kerminen Veli-Matti, Worsnop Douglas R, Kulmala Markku, Bianchi Federico
Institute for Atmospheric and Earth System Research / Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland.
Institute of Physics, University of Tartu, Tartu 50411, Estonia.
Sci Adv. 2024 Apr 5;10(14):eadm9191. doi: 10.1126/sciadv.adm9191. Epub 2024 Apr 3.
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.
由高度氧化有机分子（HOMs）引发的纯生物源新粒子形成（NPF）可能是工业化前气溶胶形成的一个重要机制。然而，由于当今大气中真正原始大陆地区稀缺，或者缺乏NPF前体的化学特征描述，这一机制在环境中尚未得到明确证实。在此，我们报告了在芬兰南部泥炭地上空对纯生物源HOM驱动的NPF进行的环境观测。夜间的气象解耦过程形成了一个“气袋”（即非常浅薄的表层），有利于完全由该泥炭地的生物源HOM引发的NPF，其大气环境与工业化前时代极为相似。我们的研究为工业化前气溶胶形成提供了线索，这代表了估算当前和未来气溶胶对气候影响以及未来NPF的基线，由于空气污染缓解，未来NPF的特征可能会恢复到类似工业化前的状况。
