Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-019-12338-8
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Funding
- Swedish Research Council FORMAS [20141445, 2015-749, 2018-01745]
- eSTICC (eScience tools for investigating Climate Change in Northern High Latitudes)
- European Commission Horizon 2020 program [654109]
- European Research Council [638703-COALA, QAPPA-335478]
- Swedish Strategic Research Program MERGE
- Knut and Alice Wallenberg foundation (academy fellowship AtmoRemove)
- Academy of Finland [272041, 299574, 1266388, 1303676]
- Centre for Scientific and Technical Computing at Lund University
- LUNARC
- CSC IT Center for Science in Espoo, Finland
- Swedish National Infrastructure for Computing, SNIC
- Formas [2018-01745] Funding Source: Formas
- Vinnova [2018-01745] Funding Source: Vinnova
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Over Boreal regions, monoterpenes emitted from the forest are the main precursors for secondary organic aerosol (SOA) formation and the primary driver of the growth of new aerosol particles to climatically important cloud condensation nuclei (CCN). Autoxidation of monoterpenes leads to rapid formation of Highly Oxygenated organic Molecules (HOM). We have developed the first model with near-explicit representation of atmospheric new particle formation (NPF) and HOM formation. The model can reproduce the observed NPF, HOM gas-phase composition and SOA formation over the Boreal forest. During the spring, HOM SOA formation increases the CCN concentration by similar to 10 % and causes a direct aerosol radiative forcing of -0.10 W/m(2). In contrast, NPF reduces the number of CCN at updraft velocities < 0.2 m/s, and causes a direct aerosol radiative forcing of +0.15 W/m(2). Hence, while HOM SOA contributes to climate cooling, NPF can result in climate warming over the Boreal forest.
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