Isoprene and Its Energy Role in the Atmospheric Photochemical Processes
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Abstract:The integrated measurements of solar radiation and isoprene emission were carried out at the Inner Mongolia Grassland during the summer season in 2002. Based on the principles of solar UV transmission and the statistical analysis on the observation data, an empirical model for calculating UV under all sky conditions was developed. This model considers the energy roles of isoprene, photochemical and scattering factors, shows reasonable results for UV at the ground and the top of the atmosphere. Based on the statistical analysis of observation data, it is found that isoprene and UV exhibit a negative energy relationship under all sky conditions, which implies the mechanism of isoprene utilizing UV energy, i.e., isoprene utilizes the energy from the substances that have direct UV absorption, then takes part in chemical and photochemical reactions in the atmosphere. Isoprene and PAR (Photosynthetically Active Radiation) also exhibit a negative energy relationship
on a canopy level. The sensitivity test shows that UV is more sensitive to isoprene factor, then photochemical factor, and scattering factor, under all sky conditions. It implies that the variation of isoprene and its oxidation products would cause the biggest change of UV at the Inner Mongolia grassland under all sky conditions. The ratio of solar scattering radiation to solar global radiation is 0.32, which means the total substances in the atmospheric column are in relatively low level at the Inner Mongolia grassland.
Abstract:The integrated measurements of solar radiation and isoprene emission were carried out at the Inner Mongolia Grassland during the summer season in 2002. Based on the principles of solar UV transmission and the statistical analysis on the observation data, an empirical model for calculating UV under all sky conditions was developed. This model considers the energy roles of isoprene, photochemical and scattering factors, shows reasonable results for UV at the ground and the top of the atmosphere. Based on the statistical analysis of observation data, it is found that isoprene and UV exhibit a negative energy relationship under all sky conditions, which implies the mechanism of isoprene utilizing UV energy, i.e., isoprene utilizes the energy from the substances that have direct UV absorption, then takes part in chemical and photochemical reactions in the atmosphere. Isoprene and PAR (Photosynthetically Active Radiation) also exhibit a negative energy relationship
on a canopy level. The sensitivity test shows that UV is more sensitive to isoprene factor, then photochemical factor, and scattering factor, under all sky conditions. It implies that the variation of isoprene and its oxidation products would cause the biggest change of UV at the Inner Mongolia grassland under all sky conditions. The ratio of solar scattering radiation to solar global radiation is 0.32, which means the total substances in the atmospheric column are in relatively low level at the Inner Mongolia grassland.
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