Isoprene and monoterpene measurements in a secondary forest in northern Benin

Saxton, Julie; Lewis, Alastair C.; Kettlewell, J. H.; Özel, Mustafa Z.; Göğüş, Fahrettin; Boni, Y.; Korogone, S. O. U.; Serça, D.

doi:10.5194/acp-7-4095-2007

Cited by 57 publications

(78 citation statements)

References 48 publications

(45 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…While ground-based measurements in the region showed evidence of large emissions of monoterpenes from some plant species (Saxton et al, 2007), samples collected on the aircraft and subsequently analyzed by gas chromatography coupled to time-of-flight mass spectrometry (GC-TOFMS) contained low amounts of four individual monoterpenes (Capes et al, 2009), consistent with PTR-MS results.…”

Section: Proton Transfer Reaction Mass Spectrometry (Ptr-ms)supporting

confidence: 58%

See 1 more Smart Citation

Measurements of volatile organic compounds over West Africa

2010

View full text Add to dashboard Cite

Abstract. In this paper we describe measurements of volatile organic compounds (VOC) made using a Proton Transfer Reaction Mass Spectrometer (PTR-MS) aboard the UK Facility for Atmospheric Airborne Measurements during the African Monsoon Multidisciplinary Analyses (AMMA) campaign. Observations were made during approximately 85 h of flying time between 17 July and 17 August 2006, above an area between 4 • N and 18 • N and 3 • W and 4 • E, encompassing ocean, mosaic forest, and the Sahel desert. High time resolution observations of counts at mass to charge (m/z) ratios of 42, 59, 69, 71, and 79 were used to calculate mixing ratios of acetonitrile, acetone, isoprene, the sum of methyl vinyl ketone and methacrolein, and benzene respectively using laboratory-derived humidity-dependent calibration factors. Strong spatial associations between vegetation and isoprene and its oxidation products were observed in the boundary layer, consistent with biogenic emissions followed by rapid atmospheric oxidation. Acetonitrile, benzene, and acetone were all enhanced in airmasses which had been heavily influenced by biomass burning. Benzene and acetone were also elevated in airmasses with urban influence from cities such as Lagos, Cotonou, and Niamey. The observations provide evidence that both deep convection and mixing associated with fair-weather cumulus were responsible for vertical redistribution of VOC emitted from the surface. Profiles over the ocean showed a depletion of acetone in the marine boundary layer, but no significant decrease for acetonitrile.

show abstract

Section: Proton Transfer Reaction Mass Spectrometry (Ptr-ms)supporting

confidence: 58%

“…Two French aircraft participating in AMMA also collected VOC using multisorbent tubes with post-campaign analysis by GC-MS (Bechara et al, 2008). VOC measurements were made at a ground-based forested site in Benin in June of 2006 with a focus on the biogenic compounds isoprene and monoterpenes (Saxton et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Measurements of volatile organic compounds over West Africa

2010

View full text Add to dashboard Cite

show abstract

“…Further-generation oxidation products (3-HGA and MBTCA) were higher in the BL (0.51 and 0.24 ng m −3 correspondingly; Table 2), with a statistically significant correlation (r = 0.90, p < 0.01) pointing to a same precursor. Monoterpenes react relatively rapidly, with atmospheric lifetimes ranging from minutes to hours (Saxton et al, 2007), resulting in α-pinene emitted in the forest ring that reacts along its upward transport to the observatory. Daytime emissions of gaseous α-pinene at Izaña were measured by Fischer et al (1998) with concentration in the range of 0.011-0.102 ppbv (mean: 0.028 ppbv), supporting evidence of its origin being close to the observatory during the day.…”

Section: Tracers Of α-Pinene Oxidation (Soa Pin)mentioning

confidence: 99%

“…2) exhibits two distinct trends in the FT that might be associated with different global sources of the precursor volatile compounds, although the trajectories of the sampled air mass do not clearly distinguish between different origins. Some species with high isoprene emission potential have been identified in central and western Africa, but quantification of isoprene emissions are largely unverified for West Africa (Saxton et al, 2007). Several evaluations of isoprene and α-pinene global emissions (Luo and Yu, 2010;Guenther et al, 2012;Sindelarova et al, 2014) confine the North Africa sources to a small belt over the northern part of Morocco, Algeria and Tunisia, whereas Europe is a potential source.…”

Section: Tracers Of Isoprene Oxidation (Soa Iso)mentioning

confidence: 99%

Speciation of organic aerosols in the Saharan Air Layer and in the free troposphere westerlies

García¹,

Drooge²,

Rodrı́guez³

et al. 2017

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. We focused this research on the composition of the organic aerosols transported in the two main airflows of the subtropical North Atlantic free troposphere: (i) the Saharan Air Layer -the warm, dry and dusty airstream that expands from North Africa to the Americas at subtropical and tropical latitudes -and (ii) the westerlies, which flow from North America over the North Atlantic at mid-and subtropical latitudes. We determined the inorganic compounds (secondary inorganic species and elemental composition), elemental carbon and the organic fraction (bulk organic carbon and organic speciation) present in the aerosol collected at Izaña Observatory, ∼ 2400 m a.s.l. on the island of Tenerife. The concentrations of all inorganic and almost all organic compounds were higher in the Saharan Air Layer than in the westerlies, with bulk organic matter concentrations within the range 0.02-4.0 µg m −3 . In the Saharan Air Layer, the total aerosol population was by far dominated by dust (93 % of bulk mass), which was mixed with secondary inorganic pollutants (< 5 %) and organic matter (∼ 1.5 %). The chemical speciation of the organic aerosols (levoglucosan, dicarboxylic acids, saccharides, n-alkanes, hopanes, polycyclic aromatic hydrocarbons and those formed after oxidation of α-pinene and isoprene, determined by gas chromatography coupled with mass spectrometry) accounted for 15 % of the bulk organic matter (determined by the thermooptical transmission technique); the most abundant organic compounds were saccharides (associated with surface soils), secondary organic aerosols linked to oxidation of biogenic isoprene (SOA ISO) and dicarboxylic acids (linked to several primary sources and SOA). When the Saharan Air Layer shifted southward, Izaña was within the westerlies stream and organic matter accounted for ∼ 28 % of the bulk mass of aerosols. In the westerlies, the organic aerosol species determined accounted for 64 % of the bulk organic matter, with SOA ISO and dicarboxylic acids being the most abundant; the highest concentration of organic matter (3.6 µg m −3 ) and of some organic species (e.g. levoglucosan and some dicarboxylic acids) were associated with biomass burning linked to a fire in North America. In the Saharan Air Layer, the correlation found between SOA ISO and nitrate suggests a large-scale impact of enhancement of the formation rate of secondary organic aerosols due to interaction with anthropogenic NO x emissions.

show abstract

“…For the determination of typical volatile organic compounds (VOCs) in air samples, extraction tubes packed with a particulate adsorbent comprising polymer beads or activated carbon are widely used [8]. Miniaturized extraction techniques including a needle-type extraction device have also been used for the determination of VOCs [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Biogenic Volatile Organic Compounds in Air Using a Solid-Phase Extraction-Type Collection Device

et al. 2018

View full text Add to dashboard Cite

In this study, the quantitative determination of gaseous biogenic volatile organic compounds (BVOCs) including monoterpenes and sesquiterpenes was accomplished using a solid-phase extraction-type collection device. The collection device was fabricated by packing styrene-divinylbenzene polymer particles into a specially designed glass cartridge. The retention performance of the collection device for BVOCs was quantitatively evaluated at 35°C with different volumes of air samples. The device showed good retention performance for the investigated BVOCs, that is, no breakthrough occurred for monoterpenes up to an air sampling volume of 150 L or for sesquiterpenes up to a sampling volume of 30,000 L. The elution performance was evaluated by passing organic solvents into the collection device, and an excellent elution recovery was obtained with 10 mL dichloromethane. Finally, the analytical method using the collection device was applied to determine the gaseous monoterpenes and sesquiterpenes from a grated carrot and the air inside a wooden house, and the results demonstrated the applicability of the method for the quantitative determination of BVOCs in several sample matrices.

show abstract

Isoprene and monoterpene measurements in a secondary forest in northern Benin

Cited by 57 publications

References 48 publications

Measurements of volatile organic compounds over West Africa

Measurements of volatile organic compounds over West Africa

Speciation of organic aerosols in the Saharan Air Layer and in the free troposphere westerlies

Analysis of Biogenic Volatile Organic Compounds in Air Using a Solid-Phase Extraction-Type Collection Device

Contact Info

Product

Resources

About