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 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.
Original language | English |
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Article number | 4370 |
Journal | Nature Communications |
Volume | 10 |
Number of pages | 15 |
ISSN | 2041-1723 |
DOIs | |
Publication status | Published - 25 Sep 2019 |
MoE publication type | A1 Journal article-refereed |
Fields of Science
- ALPHA-PINENE
- GAS
- OXIDATION-PRODUCTS
- OXIDIZED MULTIFUNCTIONAL COMPOUNDS
- OZONOLYSIS
- PARTICLE FORMATION
- PEROXY-RADICALS
- RO2 RADICALS
- SATURATION VAPOR-PRESSURES
- TROPOSPHERIC DEGRADATION
- 114 Physical sciences
- 116 Chemical sciences