Relationship between Carbon Dioxide and Number of Tourists in the Abukuma Cave, Northeast Japan

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  • 福島県あぶくま洞における観光客の入洞数と洞窟の大気環境の変化
  • フクシマケンアブクマ ドウ ニ オケル カンコウキャク ノ ニュウドウスウ ト

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In order to clarify the effects of the number of tourists on carbon dioxide in the Abukuma lime-stone cave, Northeast Japan, micro-meteorological observations were carried out in the summer and autumn of 1995. Air temperature, carbon dioxide, and wind velocity were measured by moving and fixed-point observations. High air temperature and high carbon dioxide appeared in the closed upper level of the cave. On the other hand, a breeze blows occasionally from the lower level in summer and into the lower level in autumn. The winds were caused mainly by the difference between the inside and outside air temperature of the cave, seasonally and diurnally. At the Miyama-no-jurin observa-tion point in the upper level, the relations between the cumulative number of tourists and carbon diox-ide showed a significant correlation both in summer and autumn. According to the experimental equa-tion obtained, when the visitor numbers increase to over about 1, 500, carbon dioxide becomes 2, 400ppm, which results in limestone corrosion. When they increase to over about 4, 800, carbon dioxide reaches 5, 000ppm, which is the upper limit for human safety.

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