Elucidation of the long distance transportation of sulfate ion from Asia Continent based on sulfur isotope

在1994年10月至12月期间，每24小时收集一次降水。1995年。对采集的样品进行了主要化学成分和硫同位素比值的测定。氯离子浓度在5-8月低于2ppm，在9月及以后增加到15ppm。而含氯1ppm的降水样品的钠/氯比值大多在0.1-0.5之间，低于海水的0.56。这表明，在夏季，人为来源的氯离子具有重要的贡献。NssSO4浓度在5-8月为0-2.5ppm，9月份及以后增加到5ppm。从5月(0.7-1.2)到12月(0.2-0.6)，NO3/nssSO4比值(Ppm)逐渐下降。5-7月，硫酸铵增量S为-1~3个/厂。S三角洲的值大于零表明，即使在夏季，硫酸盐离子也是从亚洲大陆输送过来的。硫同位素比率9月为0-3个/厂，11-12月为0-7个/厂。这说明陆源SO4的贡献随秋冬季节的变化而增加。S三角洲与NO3/NSSSO4比值曲线表明，降水主要分布在两个端点之间。对于中国北部排放的煤烟来说，一个终点是三角洲S，每磨5个，NO3/NSSSO4为0.2。另一个终点，德尔塔S，每厂-2，NO3/NSSSO4为1.5，在日本石油燃气中很常见。这一事实表明，来自亚洲大陆的硫酸盐离子与当地硫酸盐离子以不同的比例混合在一起。

Precipitation was collected every 24 hours during Oct. 1994-Dec. 1995. Samples collected were measured their major chemical compositions and sulfur isotope ratio. Chloride ion concentration is lower than 2 ppm in May-August and increases up to 15 ppm on and after Septmber. However most of Na/Cl ratios of precipitation samples with Cl<1 ppm range 0.1-0.5 and are lower than that of sea water (0.56). This suggests that chloride ion with anthropogenic origin significantly contributes in summer. NssSO4 concentration is 0-2.5 ppm in May-August and on and after September it increased up to 5 ppm. NO3/nssSO4 ratio in ppm gradually decreases from May (0.7-1.2) to December (0.2-0.6). Delta S of nssSO4 is-1 to 3 per mill in May-July. Delta S values higher than zero suggest that even in summer season sulfate ion is transported from Asia Continent. Sulfur isotope ratio is 0-3 per mill in September and 0-7 per mill in November-December. This suggests that the contribution of SO4 with continental origin increase with the changes of seasons from fall to winter. Delta S versus NO3/nssSO4 ratio plot shows that most precipitation distribute between two end points. One end point, delta S of 5 per mill and NO3/nssSO4 of 0.2, is typical for coal fume exhausted from northern China. The other end point, delta S of-2 per mill with NO3/nssSO4 of 1.5, is common for petroleum combustion gas in Japan. This fact suggests that sulfate ion transported from Asia Continent is mixed with local sulfate ion with various ratios.