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Discussion papers
https://doi.org/10.5194/acp-2019-948
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-948
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 16 Jan 2020

Submitted as: research article | 16 Jan 2020

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This preprint is currently under review for the journal ACP.

Mineralogy and geochemistry of Asian dust: Dependence on migration path, fractionation, and reactions with polluted air

Gi Young Jeong Gi Young Jeong
  • Department of Earth and Environmental Sciences, Andong National University, Andong 36729, Republic of Korea

Abstract. Mineralogical and geochemical data are essential for estimating the effects of long-range transport of Asian dust on the atmosphere, biosphere, cryosphere, and pedosphere. However, consistent long-term data sets of dust samples are rare. This study analyzed 25 samples collected during 14 Asian dust events occurring between 2005 and 2018 on the Korean Peninsula, and compares them to 34 soil samples (< 20 μm) obtained from the Mongolian Gobi Desert, which is a major source of Asian dust. The mineralogical and geochemical characteristics of Asian dust were consistent with those of fine source soils in general. In dust, clay minerals were most abundant, followed by quartz, plagioclase, K-feldspar, calcite, and gypsum. The trace element contents were influenced by mixing of dust with polluted air and fractionation of rare earth elements. Time-series analyses of the geochemical data of dust, combined with satellite remote sensing images, showed a significant increase of Ca content in the dust crossing the Chinese Loess Plateau and the sandy deserts of northern China. Calcareous sediments in the sandy deserts and pedogenic calcite-rich loess are probable sources of additional Ca. Dust-laden air migrating toward Korea mixes with polluted air over East Asia. Gypsum, a minor mineral in source soils, was formed by the reaction between calcite and pollutants. This study describes not only the representative properties of Asian dust, but also their variation according to the migration path, fractionation, and atmospheric reactions.

Gi Young Jeong

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Short summary
Long-range transport mineral dust interacts with atmosphere, biosphere, cryosphere, and pedosphere, influencing ecosystem, atmospheric energy balance, and air quality. This study analyzed mineral and chemical compositions of Asian dust samples collected during 14 years in Korea. The result showed mineralogical and geochemical variation depending on dust migration path, fractionation, and atmospheric reactions as well as average properties.
Long-range transport mineral dust interacts with atmosphere, biosphere, cryosphere, and...
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