兰州市大气降尘磁学特征及其环境意义

Translated title of the contribution: Magnetic properties of dustfall in Lanzhou city and its environmental significance

Hua Feng, Xiuming Liu*, Bin Lv, Mingming Ma, Pingyuan Li, Zhi Liu, Guoyong Zhao, Xuegang Mao

*Corresponding author for this work

    Research output: Contribution to journalArticle

    Abstract

    Environmental magnetic measurements were carried out on the samples of Lanzhou dustfall. These samples were collected monthly during April 2007 to June 2011 at Lanzhou University. The magnetic parameters (χ1f, SIRM, χARM, κ-T curves and magnetic hysteresis parameters) indicate a high concentration of magnetic minerals in Lanzhou, dominated by pseudo-single domain (PSD) magnetite, but also contain maghemite, lepidocrocite and hematite. They mainly come from pollution of human activities. The parameter χ1f can effectively denote the concentration variations of magnetic mineralogy of polluted dustfall. Previous studies have shown that χ1f value in Lanzhou dustfall has significant variations during the year. The value of χ1f is distinctly high in the heating months, while low in other months. Although March is also in the heating period, its χ1f value is obviously lower than other that of heating months, which might be due to the unique inversion phenomenon of Lanzhou basin: low intensity of ground inversion being conducive to the diffusion of pollutants. April and May have the lowest values throughout the year, and the reasons could be 1) low intensity of ground inversion, and 2) dilution effect of frequent occurrence of dust storms (with low χ1f) in these months. The air quality of Lanzhou has been greatly improved in winter for the last four years. In 2010, the χ1f value is 38% lower than that in 2007, indicating that environmental magnetism can effectively monitor urban pollution.

    Original languageChinese
    Pages (from-to)36-44
    Number of pages9
    JournalDili Xuebao/Acta Geographica Sinica
    Volume67
    Issue number1
    Publication statusPublished - 2012

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    Bibliographical note

    Transliterated article title: "Lán zhōu shì dà qì jiàng chén cí xué tè zhēng jí qí huán jìng yì yì"

    Cite this

    Feng, H., Liu, X., Lv, B., Ma, M., Li, P., Liu, Z., ... Mao, X. (2012). 兰州市大气降尘磁学特征及其环境意义. Dili Xuebao/Acta Geographica Sinica, 67(1), 36-44.