A Numerical Simulation of the Daily Variation of CO_2 in the Central Part of Japan : Summer Case

概要

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Since 1993, CO_2 concentration and its flux between the atmosphere and a temperate forest ecosystem have been examined in the central part of Japan (the Takayama site). Daily variation of CO_2 concentration at the Takayama site during three days in July was compared with the results of a numerical simulation, in which both the CO_2 flux of anthropogenic origin and that from the ecosystem were considered. The CO_2 flux from the ecosystem was estimated from the data at the Takayama site and extended to all the central part of Japan with the aid of a vegetation map. When the CO_2 flux at night estimated from the observation at the top of a 27 m tower at the Takayama site was used as the grid average in the model, the amplitude of CO_2 variation obtained from the calculation was smaller than the observed amplitude at the Takayama site, which is located at the top of a hill. The anthropogenic contamination of CO_2 was also investigated. The simulation suggested the possibility of long-range transport of CO_2 from Nagoya and Tokyo, two cities located about 150 km south and 300 km southeast of the Takayama site. The effect of these large cities was greater than that of nearby Takayama City.
社団法人日本気象学会の論文
2001-02-25