Monoterpene concentrations in and above a forest of scots pine

Janson, Robert W

doi:10.1007/bf00115246

Cited by 72 publications

(36 citation statements)

References 13 publications

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“…In May the concentration increased to 0.13 ppbv and in June the concentration was >0.25 ppbv. Our concentrations were similar to those observed in a Scots pine forest in central Sweden (Janson, 1992) and the fast increase in June could also be seen in the measurements of Hakola et al (2000).…”

Section: Bvoc Concentrationssupporting

confidence: 89%

Day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy and their relation to environmental and biological factors

et al. 2009

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Abstract. Atmospheric concentrations of methanol, acetaldehyde, acetone, isoprene and monoterpenes were measured using PTR-MS (proton transfer reaction mass spectrometry) in a boreal forest site in Hyytiälä, Finland (61 • 51 N, 24 • 17 E). The concentration measurements were made in the upper canopy of a Scots pine forest during 6 June, -31 August, 2007. Meteorological variables such as temperature and photosynthetically active radiation were measured simultaneously. We also detected biologically sensitive turnover points such as the onsets of photosynthetic activity, onset of growing season, bud burst and stem growth during the annual cycle and compared them to changes in BVOC (biogenic volatile organic compound) concentrations. A typical seasonal pattern of winter minimum and summer maximum was found for all studied compounds except acetaldehyde. Spring time methanol and acetone concentrations increased together with photosynthetic capacity. The day-time daily median BVOC concentrations correlated best with air temperature. The intercorrelations between compounds and the analysis of meteorological conditions indicated that the measured concentrations presented well the local source. During an exceptional summer drought period the concentrations were neither connected with photosynthesis nor transpiration, but they were regulated by some other, yet unknown factors.

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Section: Bvoc Concentrationssupporting

confidence: 89%

Day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy and their relation to environmental and biological factors

et al. 2009

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“…Isoprenoids, such as mono-and sesquiterpenes and isoprene, form a significant proportion of all atmospheric reactive BVOCs, and therefore numerous field studies have been conducted to determine their emission rates from vegetation (e.g. Isidorov et al, 1985;Janson, 1992;Tarvainen et al, 2005) and concentrations in the air (e.g. Hakola et al, 2003Hakola et al, , 2009.…”

Section: Introductionmentioning

confidence: 99%

Chemodiversity of a Scots pine stand and implications for terpene air concentrations

et al. 2012

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Abstract. Atmospheric chemistry in background areas is strongly influenced by natural vegetation. Coniferous forests are known to produce large quantities of volatile vapors, especially terpenes. These compounds are reactive in the atmosphere, and contribute to the formation and growth of atmospheric new particles.Our aim was to analyze the variability of mono-and sesquiterpene emissions between Scots pine trees, in order to clarify the potential errors caused by using emission data obtained from only a few trees in atmospheric chemistry models. We also aimed at testing if stand history and seed origin has an influence on the chemotypic diversity. The inherited, chemotypic variability in mono-and sesquiterpene emission was studied in a seemingly homogeneous 48 yr-old stand in Southern Finland, where two areas differing in their stand regeneration history could be distinguished. Sampling was conducted in August 2009. Terpene concentrations in the air had been measured at the same site for seven years prior to branch sampling for chemotypes.Two main compounds, α-pinene and 3 -carene formed together 40-97 % of the monoterpene proportions in both the branch emissions and in the air concentrations. The data showed a bimodal distribution in emission composition, in particular in 3 -carene emission within the studied population. 10 % of the trees emitted mainly α-pinene and no 3 -carene at all, whereas 20 % of the trees where characterized as high 3 -carene emitters ( 3 -carene forming >80 % of total emitted monoterpene spectrum). An intermediate group of trees emitted equal amounts of both α-pinene and 3 -carene. The emission pattern of trees at the area established using seeding as the artificial regeneration method differed from the naturally regenerated or planted trees, being mainly high 3 -carene emitters. Some differences were also seen in e.g. camphene and limonene emissions between chemotypes, but sesquiterpene emissions did not differ significantly between trees. The atmospheric concentrations at the site were found to reflect the species and/or chemodiversity rather than the emissions measured from any single tree, and were strongly dominated by α-pinene. We also tested the effect of chemodiversity on modeled monoterpene concentrations at the site and found out that since it significantly influences the distributions and hence the chemical reactions in the atmosphere, it should be taken into account in atmospheric modeling.

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“…Surface-and boundary layer concentrations of volatile organic compounds (VOC) in European boreal region have been measured by various investigators (e.g. Janson et al, 1992;Hakola et al, 2000Hakola et al, , 2003Hakola et al, , 2006aSpirig et at., 2004;Rinne et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring

et al. 2007

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Abstract. Boundary layer concentrations of several volatile organic compounds (VOC) were measured during two campaigns in springs of 2003 and 2006. The measurements were conducted over boreal landscapes near SMEAR II measurement station in Hyytiälä, Southern Finland. In 2003 the measuremens were performed using a light aircraft and in 2006 using a hot air balloon. Isoprene concentrations were low, usually below detection limit. This can be explained by low biogenic production due to cold weather, phenological stage of the isoprene emitting plants, and snow cover. Monoterpenes were observed frequently. The average total monoterpene concentration in the boundary layer was 33 ppt v . Many anthropogenic compounds such as benzene, xylene and toluene, were observed in high amounts. Ecosystem scale surface emissions were estimated using a simple mixed box budget methodology. Total monoterpene emissions varied up to 80 µg m −2 h −1 , α-pinene contributing typically more than two thirds of that. These emissions were somewhat higher that those calculated using emission algorithm. The highest emissions of anthropogenic compounds were those of p/m xylene.

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Monoterpene concentrations in and above a forest of scots pine

Cited by 72 publications

References 13 publications

Day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy and their relation to environmental and biological factors

Day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy and their relation to environmental and biological factors

Chemodiversity of a Scots pine stand and implications for terpene air concentrations

Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring

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