Abstract
We measured the concentration and OH reactivity of Biogenic Volatile Organic Compounds (BVOCs) emitted from Picea glauca, using Proton Transfer Reaction-Mass Spectrometry (PTR-MS), a Gas Chromatography-Flame Ionization Detector (GC-FID) and Laser Pump Probe Laser Induced Fluorescence (LIF) Technique. By controlling the temperature, the concentrations and OH reactivity of the BVOCs were changed. We investigated the consistency between (1) the OH reactivity derived from the LIF technique, and (2) the sum of the products of the VOC concentrations and OH reaction rate constants. As a result, the differences in the OH reactivity obtained from these two methods increased with the increasing temperature. The difference is referred to as the contribution to the OH reactivity of the VOCs species that we have not yet measured . The OH reactivity of the unmeasured VOCs is found to linearly correlate to that of the cyclic monoterpenes. This result implies that many of the unmeasured VOCs emitted from Picea glauca, which significantly contribute to the total OH reactivity, are associated with cyclic monoterpenes.
