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BVOC and speciated monoterpene concentrations and fluxes at a Scandinavian boreal forest

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Název: BVOC and speciated monoterpene concentrations and fluxes at a Scandinavian boreal forest
Autoři: Petersen, Ross, Holst, Thomas, Wu, Cheng, Krejci, Radovan, Chan, Jeremy, Mohr, Claudia, Rinne, Janne
Přispěvatelé: Lund University, Faculty of Science, Dept of Physical Geography and Ecosystem Science, Lunds universitet, Naturvetenskapliga fakulteten, Institutionen för naturgeografi och ekosystemvetenskap, Originator, Lund University, Profile areas and other strong research environments, Strategic research areas (SRA), BECC: Biodiversity and Ecosystem services in a Changing Climate, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Strategiska forskningsområden (SFO), BECC: Biodiversity and Ecosystem services in a Changing Climate, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Aerosols, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Aerosoler, Originator, Lund University, Faculty of Engineering, LTH, Other operations, LTH, Centre for Healthy Indoor Environments, Lunds universitet, Lunds Tekniska Högskola, Annan verksamhet, LTH, Centrum för hälsosamma inomhusmiljöer, CHIE, Originator, Lund University, Profile areas and other strong research environments, Strategic research areas (SRA), MERGE: ModElling the Regional and Global Earth system, Lunds universitet, Profilområden och andra starka forskningsmiljöer, Strategiska forskningsområden (SFO), MERGE: ModElling the Regional and Global Earth system, Originator
Zdroj: Atmospheric Chemistry and Physics. 25
Témata: Natural Sciences, Earth and Related Environmental Sciences, Climate Science, Naturvetenskap, Geovetenskap och relaterad miljövetenskap, Klimatvetenskap, Physical Geography, Naturgeografi, Agricultural and Veterinary sciences, Agriculture, Forestry and Fisheries, Forest Science, Lantbruksvetenskap och veterinärmedicin, Jordbruk, skogsbruk och fiske, Skogsvetenskap
Popis: Boreal forests emit terpenoid biogenic volatile organic compounds (BVOCs) that significantly affect atmospheric chemistry. Our understanding of the variation of BVOC species emitted from boreal ecosystems is based on relatively few datasets, especially at the ecosystem-level. We conducted measurements to obtain BVOC flux observations above the boreal forest at the ICOS (Integrated Carbon Observation System) station Norunda in central Sweden. The goal was to study concentrations and fluxes of terpenoids, including isoprene, speciated monoterpenes (MTs), and sesquiterpenes (SQTs), during a Scandinavian summer. Measurements (10 Hz sampling) from a Vocus proton-transfer-reaction time-of-flight mass spectrometer (Vocus PTR-ToF-MS) were used to quantify a wide range of BVOC fluxes, including total MT (386 (± 5) ng m−2 s−1; β=0.1 °C−1), using the eddy-covariance (EC) method. Surface-layer gradient (SLG) flux measurements were performed on selected daytime sampling periods, using thermal-desorption adsorbent tube sampling, to establish speciated MT fluxes. The effect of chemical degradation on measured terpenoid fluxes relative to surface exchange rates (F/E) was also investigated using stochastic Lagrangian transport modeling in forest-canopy. While the effect on isoprene was within EC-flux uncertainty (FISO/EISO <  5 %), the effect on SQT and nighttime MT was significant, with average F/E ratios for nighttime FMT/EMT = ca. 0.9 (0.87–0.93), nighttime FSQT/ESQT = 0.35  (0.31–0.41), and daytime FSQT/ESQT = 0.4 1 (0.37–0.47). The main compounds contributing to MT flux were α-pinene and Δ3-carene. Summer shifts in speciated MT emissions for Δ3-carene were detected, featuring a decrease in its relative fraction among observed MT compounds from June to August sampling periods, indicating that closer attention to seasonality of individual MT species in BVOC emission and climate models is warranted.
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  Data: BVOC and speciated monoterpene concentrations and fluxes at a Scandinavian boreal forest
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  Data: Boreal forests emit terpenoid biogenic volatile organic compounds (BVOCs) that significantly affect atmospheric chemistry. Our understanding of the variation of BVOC species emitted from boreal ecosystems is based on relatively few datasets, especially at the ecosystem-level. We conducted measurements to obtain BVOC flux observations above the boreal forest at the ICOS (Integrated Carbon Observation System) station Norunda in central Sweden. The goal was to study concentrations and fluxes of terpenoids, including isoprene, speciated monoterpenes (MTs), and sesquiterpenes (SQTs), during a Scandinavian summer. Measurements (10 Hz sampling) from a Vocus proton-transfer-reaction time-of-flight mass spectrometer (Vocus PTR-ToF-MS) were used to quantify a wide range of BVOC fluxes, including total MT (386 (&#177; 5) ng m−2 s−1; β=0.1 &#176;C−1), using the eddy-covariance (EC) method. Surface-layer gradient (SLG) flux measurements were performed on selected daytime sampling periods, using thermal-desorption adsorbent tube sampling, to establish speciated MT fluxes. The effect of chemical degradation on measured terpenoid fluxes relative to surface exchange rates (F/E) was also investigated using stochastic Lagrangian transport modeling in forest-canopy. While the effect on isoprene was within EC-flux uncertainty (FISO/EISO &lt;  5 %), the effect on SQT and nighttime MT was significant, with average&#160;F/E&#160;ratios for nighttime&#160;FMT/EMT =&#160;ca. 0.9 (0.87–0.93), nighttime&#160;FSQT/ESQT = 0.35&#160; (0.31–0.41), and daytime&#160;FSQT/ESQT&#160;= 0.4&#160;1 (0.37–0.47). The main compounds contributing to MT flux were α-pinene and Δ3-carene. Summer shifts in speciated MT emissions for Δ3-carene were detected, featuring a decrease in its relative fraction among observed MT compounds from June to August sampling periods, indicating that closer attention to seasonality of individual MT species in BVOC emission and climate models is warranted.
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