大気および氷床コア試料の精密分析に基づく揮発性有機化合物の地球化学的研究(2008年度日本地球化学会奨励賞受賞記念論文)

概要

論文の詳細を見る
Volatile organic compounds (VOC) are ubiquitously trace species in the atmosphere and play a variety of roles in the chemistry of atmosphere, including as precursors of photochemical smog formation, carriers of ozone-destroying halogens into the stratosphere, and radiatively active gases that affect on the Earth's climate system. This review summarizes our geochemical studies regarding emission sources, transport processes, and past trend of VOC in the atmosphere. The major results are (1) vertical profiles of non-methane hydrocarbons over east Asia are caused mainly by the mixing of fresh emissions with aged air masses containing reactivity-determined amount of photochemically aged non-methane hydrocarbons, (2) atmospheric concentration of methyl chloride, a naturally occurring ozone-depleting substance, was relatively constant, being similar to the present levels, during the pre-industrial Holocene, and (3) tropical plants produce methyl chloride with a biogenic mechanism and global methyl chloride emission by tropical plants represents 30-50% of the global emissions.
日本地球化学会の論文