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Willow (Salix spp.) trees are commonly used in short rotation coppices (SRC) to produce renewable energy. However, these plants are also known to emit high concentrations of biogenic volatile organic compounds (BVOCs), which have a large influence on air quality. Many different clones of commercially used Salix varieties exist today, but only a few studies have focused on BVOC emissions from these newer varieties. In this study, four varieties commercially propagated for biofuel production have been studied on a leaf-scale in the southern part of Sweden. The trees had either their first or second growing season, and measurements on BVOC emissions were done during the growing season in 2017 from the end of May to the beginning of September. Isoprene was the dominant emitted compound for all varieties but the average emission amongst varieties varied from 4.00 to 12.66 µg gdw−1 h−1. Average monoterpene (MT) (0.78–1.87 µg gdw−1 h−1) and sesquiterpene (SQT) emission rates (0.22–0.57 µg gdw−1 h−1) differed as well among the varieties. Besides isoprene, other compounds like ocimene, linalool and caryophyllene also showed a response to light but not for all varieties. Younger plants had several times higher emissions of non-isoprenoids (other VOCs) than the corresponding 1-year-old trees. The conclusions from this study show that the choice of variety can have a large impact on the regional BVOC emission budget. Genetics, together with stand age, should be taken into account when modelling BVOC emissions on a regional scale, for example, for air quality assessments.
Tomas Karlsson; Riikka Rinnan; Thomas Holst. Variability of BVOC Emissions from Commercially Used Willow (Salix spp.) Varieties. Atmosphere 2020, 11, 356 .
AMA StyleTomas Karlsson, Riikka Rinnan, Thomas Holst. Variability of BVOC Emissions from Commercially Used Willow (Salix spp.) Varieties. Atmosphere. 2020; 11 (4):356.
Chicago/Turabian StyleTomas Karlsson; Riikka Rinnan; Thomas Holst. 2020. "Variability of BVOC Emissions from Commercially Used Willow (Salix spp.) Varieties." Atmosphere 11, no. 4: 356.
A large portion of atmospheric aerosol particles consists of secondary material produced by oxidation reactions. The relative importance of secondary organic aerosol (SOA) can increase with improved emission regulations. A relatively simple way to study potential particle formation in the atmosphere is by using oxidation flow reactors (OFRs) which simulate atmospheric ageing. Here we report on the first ambient OFR ageing experiment in Europe, coupled with scanning mobility particle sizer (SMPS), aerosol mass spectrometer (AMS) and proton transfer reaction (PTR)-MS measurements. We found that the simulated ageing did not produce any measurable increases in particle mass or number concentrations during the two months of the campaign due to low concentrations of precursors. Losses in the reactor increased with hydroxyl radical (OH) exposure and with increasing difference between ambient and reactor temperatures, indicating fragmentation and evaporation of semivolatile material.
Erik Ahlberg; Stina Ausmeel; Axel Eriksson; Thomas Holst; Tomas Karlsson; William H. Brune; Göran Frank; Pontus Roldin; Adam Kristensson; Birgitta Svenningsson. No Particle Mass Enhancement from Induced Atmospheric Ageing at a Rural Site in Northern Europe. Atmosphere 2019, 10, 408 .
AMA StyleErik Ahlberg, Stina Ausmeel, Axel Eriksson, Thomas Holst, Tomas Karlsson, William H. Brune, Göran Frank, Pontus Roldin, Adam Kristensson, Birgitta Svenningsson. No Particle Mass Enhancement from Induced Atmospheric Ageing at a Rural Site in Northern Europe. Atmosphere. 2019; 10 (7):408.
Chicago/Turabian StyleErik Ahlberg; Stina Ausmeel; Axel Eriksson; Thomas Holst; Tomas Karlsson; William H. Brune; Göran Frank; Pontus Roldin; Adam Kristensson; Birgitta Svenningsson. 2019. "No Particle Mass Enhancement from Induced Atmospheric Ageing at a Rural Site in Northern Europe." Atmosphere 10, no. 7: 408.