AI Article Synopsis
- Over Boreal regions, monoterpenes are key for producing secondary organic aerosols and enhancing cloud condensation nuclei, which are important for climate.
- A new model has been created that accurately describes and predicts new particle formation and Highly Oxygenated Organic Molecules (HOM) in the atmosphere.
- The findings show that while HOM SOA formation can cool the climate by increasing CCN concentration, new particle formation can have the opposite effect, contributing to climate warming.
Article Abstract
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 ~10 % and causes a direct aerosol radiative forcing of -0.10 W/m. 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. Hence, while HOM SOA contributes to climate cooling, NPF can result in climate warming over the Boreal forest.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6761173 | PMC |
| http://dx.doi.org/10.1038/s41467-019-12338-8 | DOI Listing |
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