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解惑“gb14may18_XXXXXL56endian我错了,我的卡的日逼,日逼。是的,不太想了,他的”-知识课堂

中国学者研究雾gb14may18_XXXXXL56endian我错了,我的卡的日逼,日逼。是的,不太想了,他的霾成果对欧洲文物表层黑壳形成提出新解

来源: 观察者网
2024-12-12 20:24:29

最佳回答

“gb14may18_XXXXXL56endian我错了,我的卡的日逼,日逼。是的,不太想了,他的”中国学者研究雾gb14may18_XXXXXL56endian我错了,我的卡的日逼,日逼。是的,不太想了,他的霾成果对欧洲文物表层黑壳形成提出新解

  中新gb14may18_XXXXXL56endian我错了,我的卡的日逼,日逼。是的,不太想了,他的社合肥12月12日电 (gb14may18_XXXXXL56endian我错了,我的卡的日逼,日逼。是的,不太想了,他的记者 吴兰)记者12日从中国科学技术大学获悉,该校沈延安教授课题组在研究雾霾的物质来源和形成机制上取得重要进展。据介绍,该研究对欧洲文物、古建筑和雕像表层黑色硫酸盐壳的形成提出了新的解释,对历史遗迹保护具有重要参考意义。

  相关研究成果近日在线发表于国际综合学术期刊《美国科学院院刊》。

  受人类活动和自然条件的共同影响,当今大气污染情况严重,其中雾霾天气严重影响了经济发展和人类健康。因此,研究雾霾的物质来源和形成机制具有重要的理论和现实意义。

  研究人员对不同地质时代的煤进行燃烧实验后,对颗粒物样品中的硫酸盐组分进行高精度硫同位素测试。结果显示,煤与其燃烧产物的硫同位素组成具有显著差异。

  结合理论计算,研究人员发现煤燃烧产生了非质量硫同位素分馏,与现代硫酸盐气溶胶的异常组成一致,因此推断燃煤排放是雾霾物源之一。此前研究表明,非质量硫同位素分馏主要出现在22亿年之前岩石样品中。

  研究人员还发现,相似硫同位素的异常组成也出现在欧洲文物和雕像以及古老建筑物等表面的黑色硫酸盐壳体上。20世纪60年代以来,欧洲科学家的研究证明黑色硫酸盐壳体的形成经历了复杂的物理和化学过程,其中大气污染和火山喷发均可能起到重要作用。

  通过硫同位素的系统分析,研究人员提出燃煤排放是欧洲雕像、建筑物等历史遗迹上硫酸盐壳的重要物源,这一结论与当时欧洲在工农业发展过程中大量使用煤产生的大气污染历史高度一致。(完)

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