UC Irvine

Measurements of volatile organic compound (VOC) emission fluxes, meteorological parameters, solar global radiation and photosynthetically active radiation (PAR) were carried out in a temperate forest, Changbai Moutain, China during the summer season in 2010. VOC flux measurements were made by using relaxed eddy accumulation (REA) technique on an above canopy tower. It was found that the dominate monoterpenes emitted from this mixed forest were α-pinene, β-pinene, camphene, sabinene, myrcene, carene, limonen, ocimene, terpinene, cymene, terpinolene, and tricyclene. VOC emission and air temperature were correlated and there were evident diurnal variations, i.e., lower emissions in the morning and late evening, and the highest emissions around the noon. During the summer of 2010, the mean monoterpene emission flux was 0.242 mg·m -2·h -1, and ranged from 0.005 to 1.668 mg·m -2·h -1. The average and maximum of emission fluxes (mg·m -2·h -1) were 0.072 and 0.234 for α-pinene, 0.028 and 0.356 for camphene, 0.027 and 0.433 for myrcene, 0.023 and 0.173 for camphene, 0.037 and 0.197 for limonene, 0.016 and 0.168 for ocimene, 0.053 and 0.320 for terpinolene, and 0.067 and 0.755 for cymene, respectively.