SOA and gas phase organic acid yields from the sequential photooxidation of seven monoterpenes

Friedman, Beth; Farmer, Delphine K.

doi:10.1016/j.atmosenv.2018.06.003

Cited by 65 publications

(90 citation statements)

References 68 publications

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“…For comparison, the global ozone forcing driven by the 1990-2010 land cover change in MSEA is at the low end of the range of estimates for ozone forcing from global anthropogenic emission source sectors in year 2000 (+5 to +80 mW m −2 ): for example, industry is +15 mW m −2 ; household biofuel is +28 mW m −2 ; road transport is +50 mW m −2 ; power is +53 mW m −2 ; and biomass burning is +71 mW m −2 (Fuglestvedt et al, 2008;. A multi-model study found that 20 % reductions in NMVOCs (about 2-4 TgC y −1 ) in four large world regions (North America, East Asia, Europe, and South Asia) in 2001 led to global ozone forcings around −1 mW m −2 (Fry et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Harper

Unger

2018

Atmos. Chem. Phys.

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Over the period of 1990-2010, maritime Southeast Asia experienced large-scale land cover changes, including expansion of high-isoprene-emitting oil palm plantations and contraction of low-isoprene-emitting natural forests. The ModelE2-Yale Interactive terrestrial Biosphere global chemistry-climate model is used to quantify the atmospheric composition changes, and for the first time, the associated radiative forcing induced by the land-coverchange-driven biogenic volatile organic compound (BVOC) emission changes ( + 6.5 TgC y −1 isoprene, −0.5 TgC y −1 monoterpenes). Regionally, surface-level ozone concentrations largely decreased (−3.8 to +0.8 ppbv). The tropical land cover changes occurred in a region of strong convective transport, providing a mechanism for the BVOC perturbations to affect the composition of the upper troposphere. Enhanced concentrations of isoprene and its degradation products are simulated in the upper troposphere, and, on a globalmean basis, land cover change had a stronger impact on ozone in the upper troposphere (+0.5 ppbv) than in the lower troposphere (< 0.1 ppbv increase). The positive climate forcing from ozone changes (+9.2 mW m −2 ) was partially offset by a negative forcing (−0.8 mW m −2 ) associated with an enhancement in secondary organic aerosol (SOA). The sign of the net forcing is sensitive to uncertainty in the SOA yield from BVOCs. The global-mean ozone forcing per unit of regional oil palm expansion is +1 mW m −2 Mha −1 . In light of expected continued expansion of oil palm plantations, regional land cover changes may play an increasingly important role in driving future global ozone radiative forcing.

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Section: Discussionmentioning

confidence: 99%

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Harper

Unger

2018

Atmos. Chem. Phys.

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“…Analysis of BVOC emissions of nest mounds revealed that emissions are rich in MTs, particularly α-pinene, β-pinene and limonene with lower quantities of longifolene, myrcene, sabinene, camphor and camphene (Sorvari and Hartikainen, unpublished). However, ant workers are important emitters of formic acid, which is also a product of atmospheric MT-OH reactions (Friedman and Farmer 2018). Ants spray formic acid as a defence chemical when disturbed, and inside their nest, ant workers mix it with conifer resin to increase the antifungal effects of resin against entomopathogenic fungi (Brütsch et al 2017).…”

Section: Bvocs Of Rhizosphere Litter and Understorymentioning

confidence: 99%

“…Finally, the reaction products are lost as the deposition of organic particles on various surfaces Holopainen et al 2017) or become oxidised to small-molecular gases such as CO or CO 2 (Kroll and Seinfeld 2008). Friedman and Farmer (2018) summarised the role of MT BVOCs in atmospheric reactions in the following three processes: (1) BVOCs acting as parent hydrocarbons for the formation of SOA in reactions with ozone (O 3 ) (Joutsensaari et al 2015;Zhao et al 2017;Berndt et al 2018), hydroxyl radical (OH) (Berndt et al 2018;Friedman and Farmer 2018) or nitrate (NO 3 ) radical ), (2) BVOCs that react with hydroxyl (OH) radicals to form peroxy radicals (RO 2 ) (Zhao et al 2015), which participate in photochemical tropospheric O 3 production (Berndt et al 2018;Friedman and Farmer 2018) and (3) BVOCs that react with O 3 at night to produce OH radicals (Lee et al 2016).…”

Section: Bvoc Reactions In the Atmospherementioning

confidence: 99%

“…Formation of O 3 is often highest in downwind rural or forested areas outside metropolitan areas, where NOx react with local BVOCs (Jeon et al 2014). Reactions of newly formed O 3 with the BVOC molecules that have double bonds (Atkinson and Arey 2003) also lead to formation of reactive OH radicals (Berndt et al 2018;Friedman and Farmer 2018). In addition to O 3 , many BVOCs are very reactive with hydroxyl radicals (OH) or nitrate (NO 3 ) radicals leading to formation of SOA (Atkinson and Arey 2003).…”

Section: Bvoc Reactions In the Atmospherementioning

confidence: 99%

“…However, MTs and SQTs are the most reactive BVOCs emitted by the dominating European forest trees (Oderbolz et al 2013). They readily react with atmospheric oxidants such as ozone, OH and NO 3 radicals, which leads to further reactions that form low-volatility vapours (Friedman and Farmer 2018) and SOA (Virtanen et al 2010) in the forest atmosphere. Biogenic SOA is capable of screening out excess solar radiation and participating in cloud formation (Ehn et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Unravelling the functions of biogenic volatiles in boreal and temperate forest ecosystems

et al. 2019

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Living trees are the main source of biogenic volatile organic compounds (BVOCs) in forest ecosystems, but substantial emissions originate from leaf and wood litter, the rhizosphere and from microorganisms. This review focuses on temperate and boreal forest ecosystems and the roles of BVOCs in ecosystem function, from the leaf to the forest canopy and from the forest soil to the atmosphere level. Moreover, emphasis is given to the question of how BVOCs will help forests adapt to environmental stress, particularly biotic stress related to climate change. Trees use their vascular system and emissions of BVOCs in internal communication, but emitted BVOCs have extended the communication to tree population and whole community levels and beyond. Future forestry practices should consider the importance of BVOCs in attraction and repulsion of attacking bark beetles, but also take an advantage of herbivore-induced BVOCs to improve the efficiency of natural enemies of herbivores. BVOCs are extensively involved in ecosystem services provided by forests including the positive effects on human health. BVOCs have a key role in ozone formation but also in ozone quenching. Oxidation products form secondary organic aerosols that disperse sunlight deeper into the forest canopy, and affect cloud formation and ultimately the climate. We also discuss the technical side of reliable BVOC sampling of forest trees for future interdisciplinary studies that should bridge the gaps between the forest sciences, health sciences, chemical ecology, conservation biology, tree physiology and atmospheric science.

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Kinetics of reactions of NH₄⁺ with some biogenic organic molecules and monoterpenes in helium and nitrogen carrier gases: A potential reagent ion for selected ion flow tube mass spectrometry

Swift

Smith

Dryahina

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale To assess the suitability of NH4+ as a reagent ion for trace gas analysis by selected ion flow tube mass spectrometry, SIFT‐MS, its ion chemistry must be understood. Thus, rate coefficients and product ions for its reactions with typical biogenic molecules and monoterpenes need to be experimentally determined in both helium, He, and nitrogen, N2, carrier gases. Methods NH4+ and H3O+ were generated in a microwave gas discharge through an NH3 and H2O vapour mixture and, after m/z selection, injected into He and N2 carrier gas. Using the conventional SIFT method, NH4+ reactions were then studied with M, the biogenic molecules acetone, 1‐propanol, 2‐butenal, trans‐2‐heptenal, heptanal, 2‐heptanone, 2,3‐heptanedione and 15 monoterpene isomers to obtain rate coefficients, k, and product ion branching ratios. Polarisabilities and dipole moments of the reactant molecules and the enthalpy changes in proton transfer reactions were calculated using density functional theory. Results The k values for the reactions of the biogenic molecules were invariably faster in N2 than in He but similar in both bath gases for the monoterpenes. Adducts NH4+M were the dominant product ions in He and N2 for the biogenic molecules, whereas both MH+ and NH4+M product ions were observed in the monoterpene reactions; the monoterpene ratio correlating (R2 = 0.7) with the proton affinity, PA, of the monoterpene molecule as calculated. The data indicate that this adduct ion formation is the result of bimolecular rather than termolecular association. Conclusions NH4+ can be a useful reagent ion for SIFT‐MS analyses of molecules with PA(M) < PA(NH3) when the dominant single product ion is the adduct NH4+M. For molecules with PA(M) > PA(NH3), such as monoterpenes, both MH+ and NH4+M ions are likely products, which must be determined along with k by experiment.

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SOA and gas phase organic acid yields from the sequential photooxidation of seven monoterpenes

Cited by 65 publications

References 68 publications

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Unravelling the functions of biogenic volatiles in boreal and temperate forest ecosystems

Kinetics of reactions of NH₄⁺ with some biogenic organic molecules and monoterpenes in helium and nitrogen carrier gases: A potential reagent ion for selected ion flow tube mass spectrometry

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SOA and gas phase organic acid yields from the sequential photooxidation of seven monoterpenes

Cited by 65 publications

References 68 publications

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Global climate forcing driven by altered BVOC fluxes from 1990 to 2010 land cover change in maritime Southeast Asia

Unravelling the functions of biogenic volatiles in boreal and temperate forest ecosystems

Kinetics of reactions of NH4+ with some biogenic organic molecules and monoterpenes in helium and nitrogen carrier gases: A potential reagent ion for selected ion flow tube mass spectrometry

Contact Info

Product

Resources

About

Kinetics of reactions of NH₄⁺ with some biogenic organic molecules and monoterpenes in helium and nitrogen carrier gases: A potential reagent ion for selected ion flow tube mass spectrometry