Formation of Secondary Organic Aerosols Through Photooxidation of Isoprene

  title={Formation of Secondary Organic Aerosols Through Photooxidation of Isoprene},
  author={Magda Claeys and Bim Graham and Gyorgy Vas and Wu Wang and Reinhilde Vermeylen and V. A. Pashynska and Jan Cafmeyer and Pascal Guyon and Meinrat O. Andreae and Paulo Artaxo and Willy Maenhaut},
  pages={1173 - 1176}
Detailed organic analysis of natural aerosols from the Amazonian rain forest showed considerable quantities of previously unobserved polar organic compounds, which were identified as a mixture of two diastereoisomeric 2-methyltetrols: 2-methylthreitol and 2-methylerythritol. These polyols, which have the isoprene skeleton, can be explained by OH radical–initiated photooxidation of isoprene. They have low vapor pressure, allowing them to condense onto preexisting particles. It is estimated that… 
Global secondary organic aerosol from isoprene oxidation
Inclusion of isoprene as a source of secondary organic aerosol (SOA) in a global model increases the global burden of SOA from all sources by more than a factor of two. The isoprene source
Secondary organic aerosols from anthropogenic and biogenic precursors.
Evidence for oligomer formation for SOA from both precursors was given by an increasing abundance of compounds with a high molecular weight and by an increase thermal stability with increasing aging time.
Efficient Isoprene Secondary Organic Aerosol Formation from a Non-IEPOX Pathway.
Online measurements of aerosol molecular composition show that the fate of second-generation RO2 radicals is key to understanding the efficient SOA formation and the NOx-dependent yields described here and in the literature, and suggest that a more-complex representation of NOX-dependent SOA yields may be important in models.
Laboratory observation of oligomers in the aerosol from isoprene/NOx photooxidation
Compounds assigned to be oxidation products of isoprene (2‐methyl‐1,3‐butadiene) have recently been observed in ambient aerosols, suggesting that isoprene might play an important role in secondary
Isoprene forms secondary organic aerosol through cloud processing: model simulations.
It is concluded that cloud processing of isoprene is an important contributor to SOA production, altering the global distribution of hygroscopic organic aerosol and cloud condensation nuclei.
Secondary organic aerosol formation from isoprene photooxidation.
At high NOx, yields are found to decrease substantially with increasing [NOx], indicating the importance of RO2 chemistry in SOA formation.
Evidence for a significant proportion of Secondary Organic Aerosol from isoprene above a maritime tropical forest
Abstract. Isoprene is the most abundant non-methane biogenic volatile organic compound (BVOC), but the processes governing secondary organic aerosol (SOA) formation from isoprene oxidation are only
Unexpected Epoxide Formation in the Gas-Phase Photooxidation of Isoprene
It is reported here that under pristine conditions isoprene is oxidized primarily to hydroxyhydroperoxides, which leads efficiently to the formation of dihydroxyepoxides and OH reformation, which provides a missing link tying the gas-phase degradation of isoprenes to the observed formation of organic aerosols.
Epoxide as a precursor to secondary organic aerosol formation from isoprene photooxidation in the presence of nitrogen oxides
Evidence is presented that in the presence of high levels of nitrogen oxides typical of urban atmospheres, 2-methyloxirane-2-carboxylic acid (methacrylic acid epoxide, MAE) is a precursor to known isoprene-derived SOA tracers, and ultimately to SOA, and it is proposed that MAE arises from decomposition of the OH adduct of methacryloyl peroxide (MPAN).


Secondary organic aerosol formation in the atmosphere via heterogeneous reaction of gaseous isoprene on acidic particles
Water‐soluble macromolecular substances with spectral properties of “humic‐like substances” (HULIS) were recently found to form the major identified fraction of the organic aerosol at urban and rural
Direct evidence of atmospheric secondary organic aerosol formation in forest atmosphere through heteromolecular nucleation.
Calculations indicated that primarily emitted organic species and ambient temperature play a crucial role in secondary organic aerosol formation.
Formation of Organic Aerosols from the Oxidation of Biogenic Hydrocarbons
AbstractMeasurements of aerosol formation during thephotooxidation of α-pinene, β-pinene,d-3-carene, d-limonene, ocimene, linalool, terpinene-4-ol, andtrans-caryophyllene were conducted in anoutdoor
Formation of atmospheric particles from organic acids produced by forests
Aerosol formation in the atmosphere is an important process to understand, in that such particles may act as the cloud condensation nuclei responsible for the ‘cloud–climate’ effect, and could
Molecular composition of organic aerosols formed in the α‐pinene/O3 reaction: Implications for new particle formation processes
The molecular composition of particle phase ozonolysis products of α-pinene is investigated to comprehend the aerosol formation process following the VOC oxidation, focusing on an understanding of
Organic compounds present in the natural Amazonian aerosol: Characterization by gas chromatography–mass spectrometry
As part of the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA)-Cooperative LBA Airborne Regional Experiment (CLAIRE) 2001 campaign in July 2001, separate day and nighttime aerosol
Atmospheric aerosols: Biogeochemical sources and role in atmospheric chemistry
Atmospheric aerosols play important roles in climate and atmospheric chemistry: They scatter sunlight, provide condensation nuclei for cloud droplets, and participate in heterogeneous chemical
Large contribution of organic aerosols to cloud-condensation-nuclei concentrations
THE albedo and radiative properties of marine stratus clouds are determined largely by the number density of cloud condensation nuclei (CCN) over the oceans. Modelling studies have suggested that
A case study of gas-to-particle conversion in an eastern Canadian forest
Aerosol and trace gas measurements were made at Kejimkujik National Park, Nova Scotia, Canada, during the summer of 1996. A case study from July 7-8 provides evidence of nucleation and condensation