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首页> 外文期刊>Earth, planets and space: EPS >Soil gas emission of volcanic CO_2 at Satsuma-Iwojima volcano, Japan
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Soil gas emission of volcanic CO_2 at Satsuma-Iwojima volcano, Japan

机译：日本萨摩县岩岛火山火山CO_2​​的土壤气体排放

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摘要

Soil gas surveys were carried out in November 1999 and October 2000 at Satsuma-Iwojima volcano, southwest Japan. The chemical composition of the soil gas was a mixture of CO_2 and air components, with CO_2 concentrations ranging from 0.03 to 59 vol%. The origin of the soil CO_2 was evaluated on the basis of the variation of δ~(13)C_(co_2) and CO_2 concentration. Although most of the CO_2 is of biogenic origin, large volcanic contributions of greater than 50% were found close to the caldera rim, where soil temperature anomalies were observed. Emission rate of volcanic CO_2 was estimated by assuming simple mixing among volcanic, atmospheric, and biogenic CO_2. High rates of diffuse emission of volcanic CO_2 were also observed at the caldera rim and close to some hot springs, indicating that part of the volcanic-gas discharge ascends through fissures along the caldera rim. The flux of the volcanic CO_2 through the soil is estimated to be 20 t day~(-1); this is 25% of the total CO_2 flux through soil and 20% of the CO_2 flux from volcanic fumaroles in the main crater of Iwodake.
机译：1999年11月和2000年10月在日本西南部的萨摩-岩岛火山进行了土壤气调查。土壤气体的化学成分是CO_2和空气成分的混合物，CO_2浓度范围为0.03至59 vol％。根据δ〜（13）C_（co_2）和CO_2浓度的变化，评价了土壤CO_2的来源。尽管大多数CO_2是生物成因的，但在火山口边缘附近发现了超过50％的大火山作用，在火山口边缘观察到土壤温度异常。通过假设火山，大气和生物CO_2之间的简单混合来估算火山CO_2​​的排放率。在火山口边缘和一些温泉附近还观察到了火山CO_2​​的高扩散散发，这表明火山气体的一部分通过沿火山口边缘的裂隙上升。火山二氧化碳穿过土壤的通量估计为20 t day〜（-1）;这是通过土壤的CO_2总通量的25％，是岩岳湖主火山口中来自火山喷气孔的CO_2通量的20％。

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