Presentation Information
[SS14-02]Real-time monitoring of day-night oscillations of biogenic volatile organic compounds in forest ecosystems
*Kanako Sekimoto1 (1. Yokohama City University (Japan))
Keywords:
Biogenic volatile organic compounds (BVOCs),Proton-transfer reaction mass spectrometry (PTR-MS)
Biogenic volatile organic compounds (BVOCs) emitted from plants exist in the atmosphere with quite low concentrations in ppb-ppt order. BVOCs play an important role for chemical ecology and troposheric chemistry. For example, it is known that so-called “green leaf volatiles”, such as hexanal and hexanol, affect plant-herbivore, plant-plant, and plant-carnivore interactions. BVOCs with high reactivity with OH radical, such as isoprene and monoterpenes, eventually lead to formation of aerosols which affect Earth’s radiation balance by scattering solar radiation and acting as cloud condensation nuclei, as well as air quality. However, there has been little comprehensive identification and high-time-resolution and on-site monitoring of BVOCs due to limitation of conventional instrumentation. Thus we have unexplored detailed characteristics of various BVOCs, including the diurnal variations of individual compounds and the role for their behavior on chemical ecology and tropospheric chemistry.
The author has been developing a state-of-the-art technique that enables quantitative measurements of various BVOCs in real time and on site based on “proton-transfer reaction mass spectrometry (PTR-MS)”. Using this technique, a field campaign was conducted last summer in Shirakami mountain site (the Shirakami Natural Science Park, Hirosaki Univ., including secondary forest dominated by Quercus crispula). We succesfully measured various BVOCs emitted from vertically different positions on the same tree during six days. We will present these results in terms of how BVOC emissions vary and oscillate from daytime to nighttime at individual positions and how their variations correlates forest environments.
The author has been developing a state-of-the-art technique that enables quantitative measurements of various BVOCs in real time and on site based on “proton-transfer reaction mass spectrometry (PTR-MS)”. Using this technique, a field campaign was conducted last summer in Shirakami mountain site (the Shirakami Natural Science Park, Hirosaki Univ., including secondary forest dominated by Quercus crispula). We succesfully measured various BVOCs emitted from vertically different positions on the same tree during six days. We will present these results in terms of how BVOC emissions vary and oscillate from daytime to nighttime at individual positions and how their variations correlates forest environments.