scholarly journals EVOLUTION OF SELECTED ISOPRENE OXIDATION PRODUCTS IN DARK AQUEOUS AMMONIUM SULFATE

2014 ◽  
Author(s):  
D.M. Ashraf Ul Habib
Keyword(s):  
Ammonium Sulfate ◽  
Oxidation Products ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

scholarly journals Emissions of putative isoprene oxidation products from mango branches under abiotic stress

2013 ◽  
Vol 64 (12) ◽  
pp. 3669-3679 ◽  
Author(s):  
Kolby J. Jardine ◽  
Kimberly Meyers ◽  
Leif Abrell ◽  
Eliane G. Alves ◽  
Ana Maria Yanez Serrano ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Oxidation Products ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

Secondary organic aerosol yields from cloud-processing of isoprene oxidation products

2008 ◽  
Vol 35 (2) ◽  
Author(s):  
Barbara Ervens ◽  
Annmarie G. Carlton ◽  
Barbara J. Turpin ◽  
Katye E. Altieri ◽  
Sonia M. Kreidenweis ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Oxidation Products ◽  
Cloud Processing ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

scholarly journals Marine aerosol production: a review of the current knowledge

2007 ◽  
Vol 365 (1856) ◽  
pp. 1753-1774 ◽  
Author(s):  
Colin D O'Dowd ◽  
Gerrit de Leeuw
Keyword(s):  
Sulphuric Acid ◽  
Current Knowledge ◽  
Oxidation Products ◽  
Marine Aerosol ◽  
Aerosol Formation ◽  
Multistep Process ◽  
Isoprene Oxidation ◽  
Iodine Oxides ◽  
20 Nm ◽  
Isoprene Oxidation Products

The current knowledge in primary and secondary marine aerosol formation is reviewed. For primary marine aerosol source functions, recent source functions have demonstrated a significant flux of submicrometre particles down to radii of 20 nm. Moreover, the source functions derived from different techniques up to 10 μm have come within a factor of two of each other. For secondary marine aerosol formation, recent advances have identified iodine oxides and isoprene oxidation products, in addition to sulphuric acid, as contributing to formation and growth, although the exact roles remains to be determined. While a multistep process seems to be required, isoprene oxidation products are more likely to participate in growth and sulphuric acid is more likely to participate in nucleation. Iodine oxides are likely to participate in both nucleation and growth.

scholarly journals Canopy fluxes of monoterpene, isoprene and isoprene oxidation products in a pine-oak forest

2020 ◽  
Vol 76 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Tomoki MOCHIZUKI ◽  
Satoru TAKANASHI ◽  
Ryuichi WADA ◽  
Yuzo MIYAZAKI ◽  
Takashi NAKANO ◽  
...  
Keyword(s):  
Oxidation Products ◽  
Oak Forest ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

Evidence for Oligomer Formation in Clouds:  Reactions of Isoprene Oxidation Products

2006 ◽  
Vol 40 (16) ◽  
pp. 4956-4960 ◽  
Author(s):  
Katye E. Altieri ◽  
Annmarie G. Carlton ◽  
Ho-Jin Lim ◽  
Barbara J. Turpin ◽  
Sybil P. Seitzinger
Keyword(s):  
Oxidation Products ◽  
Oligomer Formation ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

scholarly journals Surface and boundary layer exchanges of volatile organic compounds, nitrogen oxides and ozone during the GABRIEL campaign

2008 ◽  
Vol 8 (20) ◽  
pp. 6223-6243 ◽  
Author(s):  
L. Ganzeveld ◽  
G. Eerdekens ◽  
G. Feig ◽  
H. Fischer ◽  
H. Harder ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Residual Layer ◽  
Oxidation Products ◽  
Emission Flux ◽  
Mixing Ratios ◽  
Volatile Organic ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

Abstract. We present an evaluation of sources, sinks and turbulent transport of nitrogen oxides, ozone and volatile organic compounds (VOC) in the boundary layer over French Guyana and Suriname during the October 2005 GABRIEL campaign by simulating observations with a single-column chemistry and climate model (SCM) along a zonal transect. Simulated concentrations of O3 and NO as well as NO2 photolysis rates over the forest agree well with observations when a small soil-biogenic NO emission flux was applied. This suggests that the photochemical conditions observed during GABRIEL reflect a pristine tropical low-NOx regime. The SCM uses a compensation point approach to simulate nocturnal deposition and daytime emissions of acetone and methanol and produces daytime boundary layer mixing ratios in reasonable agreement with observations. The area average isoprene emission flux, inferred from the observed isoprene mixing ratios and boundary layer height, is about half the flux simulated with commonly applied emission algorithms. The SCM nevertheless simulates too high isoprene mixing ratios, whereas hydroxyl concentrations are strongly underestimated compared to observations, which can at least partly explain the discrepancy. Furthermore, the model substantially overestimates the isoprene oxidation products methlyl vinyl ketone (MVK) and methacrolein (MACR) partly due to a simulated nocturnal increase due to isoprene oxidation. This increase is most prominent in the residual layer whereas in the nocturnal inversion layer we simulate a decrease in MVK and MACR mixing ratios, assuming efficient removal of MVK and MACR. Entrainment of residual layer air masses, which are enhanced in MVK and MACR and other isoprene oxidation products, into the growing boundary layer poses an additional sink for OH which is thus not available for isoprene oxidation. Based on these findings, we suggest pursuing measurements of the tropical residual layer chemistry with a focus on the nocturnal depletion of isoprene and its oxidation products.

scholarly journals Gas-particle partitioning of polyol tracers in the western Yangtze River Delta, China: Absorptive or Henry's law partitioning?

2021 ◽  
Author(s):  
Chao Qin ◽  
Yafeng Gou ◽  
Yuhang Wang ◽  
Yuhao Mao ◽  
Hong Liao ◽  
...  
Keyword(s):  
Yangtze River ◽  
Organic Aerosols ◽  
Yangtze River Delta ◽  
Water Soluble ◽  
Oxidation Products ◽  
Particle Phase ◽  
Henry's Law ◽  
Henry’S Law ◽  
Isoprene Oxidation ◽  
Isoprene Oxidation Products

Abstract. Gas-particle partitioning of water-soluble organic compounds plays a significant role in the formation and source apportionment of organic aerosols, but is poorly characterized. In this work, gas- and particle-phase concentrations of isoprene oxidation products (C5-alkene triols and 2-methylterols), levoglucosan, and sugar polyols were measured simultaneously at a suburban site of the western Yangtze River Delta in east China. All target polyols were primarily distributed into the particle phase (85.9–99.8 %), and their average particle-phase fractions were not strictly dependent on vapor pressures. Moreover, the measurement-based partitioning coefficients (Kp,OM) of isoprene oxidation products and levoglucosan were 102 to 104 times larger than their predicted Kp,OM based on the equilibrium absorptive partitioning model. These are likely attributed to the hygroscopic properties of polyol tracers and high aerosol liquid water (ALW) concentrations (~20 µg m−3) of the study location. Due to the large gaps (up to 107) between measurement-based effective Henry's law coefficients (KH,e) and predicted values in pure water (KH,w), the gas-particle partitioning of polyol tracers could not be depicted using Henry's law alone either. The regressions of log (KH,w/KH,e) versus molality of major water-soluble components in ALW indicated that sulfate ions (salting-in effect) and water-soluble organic carbon can promote the partitioning of polyol tracers into the aqueous phase. These results suggest a partitioning mechanism of enhanced aqueous-phase uptake for polyol tracers, which partly reveals the discrepancy between observation and modeling of secondary organic aerosols.

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