Evidence for Diverse Biogeochemical Drivers of Boreal Forest New Particle Formation

Evidence for Diverse Biogeochemical Drivers of Boreal Forest New Particle Formation New particle formation (NPF) is an important contributor to particle number in many locations, but the chemical drivers for this process are not well understood. Daytime NPF events occur regularly in the springtime Finnish boreal forest and strongly impact aerosol abundance. In April 2014 size‐resolved chemical measurements of ambient nanoparticles were made using the Time‐of‐Flight Thermal Desorption Chemical ionization Mass Spectrometer and we report results from two NPF events. While growth overall was dominated by terpene oxidation products, newly formed 20–70 nm particles showed enhancement in apparent alkanoic acids. The events occurred on days with rapid transport of marine air, which correlated with low background aerosol loading and higher gas phase methanesulfonic acid levels. These results are broadly consistent with previous studies on Nordic NPF but indicate that further attention should be given to the sources and role of non‐terpenoid organics and the possible contribution of transported marine compounds in this process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Evidence for Diverse Biogeochemical Drivers of Boreal Forest New Particle Formation

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Publisher
Wiley
Copyright
©2018. American Geophysical Union. All Rights Reserved.
ISSN
0094-8276
eISSN
1944-8007
D.O.I.
10.1002/2017GL076394
Publisher site
See Article on Publisher Site

Abstract

New particle formation (NPF) is an important contributor to particle number in many locations, but the chemical drivers for this process are not well understood. Daytime NPF events occur regularly in the springtime Finnish boreal forest and strongly impact aerosol abundance. In April 2014 size‐resolved chemical measurements of ambient nanoparticles were made using the Time‐of‐Flight Thermal Desorption Chemical ionization Mass Spectrometer and we report results from two NPF events. While growth overall was dominated by terpene oxidation products, newly formed 20–70 nm particles showed enhancement in apparent alkanoic acids. The events occurred on days with rapid transport of marine air, which correlated with low background aerosol loading and higher gas phase methanesulfonic acid levels. These results are broadly consistent with previous studies on Nordic NPF but indicate that further attention should be given to the sources and role of non‐terpenoid organics and the possible contribution of transported marine compounds in this process.

Journal

Geophysical Research LettersWiley

Published: Jan 28, 2018

Keywords: ; ; ; ; ;

References

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