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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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兰州市大气降尘磁学特征及其环境意义
DOI: 10.11821/xb201201004, PP. 36-44
Keywords: 环境磁学,大气降尘,逆温强度,污染检测,兰州市
Abstract:
对兰州市大气降尘进行系统的环境磁学测量及分析。结果表明,兰州市大气降尘中磁性矿物总体含量较高,以假单畴磁铁矿为主,并伴有少量的磁赤铁矿、纤铁矿及赤铁矿,而且它们主要是来自人类活动产生的污染。过去研究表明,磁性矿物含量年内变化特征显著,冬季污染值高是由于供暖所致,但3月份虽然处于供暖期,它的污染值却明显低于其它供暖期,我们认为主要是兰州市特有的逆温现象3月份贴地逆温强度低,利于污染物扩散所导致。4、5月份污染值全年最低,除了逆温层的作用以外,还与该月份频发的沙尘暴带来的低χlf值的稀释作用有关。近年来,随着污染防治工作的开展,兰州市大气污染状况有了较大改善,2010年χlf值比2007年降低了38%,证明环境磁学方法可以有效地监测城市污染。
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