Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Sources of aeolian magnetite at a remote site in Japan: Dominantly Asian desert dust or anthropogenic emissions?
https://orcid.org/0000-0001-8514-5396
https://orcid.org/0000-0002-7582-9572
https://orcid.org/0000-0001-7968-414X
Abstract Asian dust (AD) profoundly impacts human health and the environment, and the soluble Fe in AD is essential for nutrient supply to the ocean and atmospheric chemistry. To accurately assess the impacts of AD, it must be separated from other natural and anthropogenic sources in the total aerosol loading. In this study, coarse aerosol samples (Dp > 2.5 μm) collected in Noto, a remote coastal area in Japan, were analyzed through an environmental magnetic analysis. A comparison of the metal content and Pb isotopic ratios revealed that the magnetization of aerosols, which reflects magnetite content, highly correlated with AD inflow. That is, aerosol magnetite is preferentially concentrated in atmospheric particles during AD events; therefore, AD-affected samples can easily be identified and distinguished from those primarily affected by transboundary air pollution by using magnetic measurements. Based on the magnetization intensity of an AD reference material (CJ-2), the AD loading for ambient samples was estimated to be 5.2–32 μg/m3, similar to that calculated based on the Al mass concentration. Moreover, magnetism is strongly linked with Fe solubility in the ambient samples. This is notable because such information has been obtained previously only through labor-intensive chemical speciation involving sequential extraction. Therefore, magnetism can be used as a new measure of both AD loading and Fe solubility via non-destructive measurements.
Graphical abstract Display Omitted
Highlights Magnetism of coarse aerosols in the Asian continental outflow was investigated, along with metal and isotopic compositions. Aerosol magnetization is primarily controlled by the magnetite content and remarkably enhanced during Asian dust events. Influence of Asian dust and anthropogenic emission can be identified simply by comparing aerosol mass and magnetization. Aerosol magnetization was also proposed as a new measure of Fe solubility.
Sources of aeolian magnetite at a remote site in Japan: Dominantly Asian desert dust or anthropogenic emissions?
https://orcid.org/0000-0001-8514-5396
https://orcid.org/0000-0002-7582-9572
https://orcid.org/0000-0001-7968-414X
Abstract Asian dust (AD) profoundly impacts human health and the environment, and the soluble Fe in AD is essential for nutrient supply to the ocean and atmospheric chemistry. To accurately assess the impacts of AD, it must be separated from other natural and anthropogenic sources in the total aerosol loading. In this study, coarse aerosol samples (Dp > 2.5 μm) collected in Noto, a remote coastal area in Japan, were analyzed through an environmental magnetic analysis. A comparison of the metal content and Pb isotopic ratios revealed that the magnetization of aerosols, which reflects magnetite content, highly correlated with AD inflow. That is, aerosol magnetite is preferentially concentrated in atmospheric particles during AD events; therefore, AD-affected samples can easily be identified and distinguished from those primarily affected by transboundary air pollution by using magnetic measurements. Based on the magnetization intensity of an AD reference material (CJ-2), the AD loading for ambient samples was estimated to be 5.2–32 μg/m3, similar to that calculated based on the Al mass concentration. Moreover, magnetism is strongly linked with Fe solubility in the ambient samples. This is notable because such information has been obtained previously only through labor-intensive chemical speciation involving sequential extraction. Therefore, magnetism can be used as a new measure of both AD loading and Fe solubility via non-destructive measurements.
Graphical abstract Display Omitted
Highlights Magnetism of coarse aerosols in the Asian continental outflow was investigated, along with metal and isotopic compositions. Aerosol magnetization is primarily controlled by the magnetite content and remarkably enhanced during Asian dust events. Influence of Asian dust and anthropogenic emission can be identified simply by comparing aerosol mass and magnetization. Aerosol magnetization was also proposed as a new measure of Fe solubility.
Sources of aeolian magnetite at a remote site in Japan: Dominantly Asian desert dust or anthropogenic emissions?
https://orcid.org/0000-0001-8514-5396
https://orcid.org/0000-0002-7582-9572
https://orcid.org/0000-0001-7968-414X
Abstract Asian dust (AD) profoundly impacts human health and the environment, and the soluble Fe in AD is essential for nutrient supply to the ocean and atmospheric chemistry. To accurately assess the impacts of AD, it must be separated from other natural and anthropogenic sources in the total aerosol loading. In this study, coarse aerosol samples (Dp > 2.5 μm) collected in Noto, a remote coastal area in Japan, were analyzed through an environmental magnetic analysis. A comparison of the metal content and Pb isotopic ratios revealed that the magnetization of aerosols, which reflects magnetite content, highly correlated with AD inflow. That is, aerosol magnetite is preferentially concentrated in atmospheric particles during AD events; therefore, AD-affected samples can easily be identified and distinguished from those primarily affected by transboundary air pollution by using magnetic measurements. Based on the magnetization intensity of an AD reference material (CJ-2), the AD loading for ambient samples was estimated to be 5.2–32 μg/m3, similar to that calculated based on the Al mass concentration. Moreover, magnetism is strongly linked with Fe solubility in the ambient samples. This is notable because such information has been obtained previously only through labor-intensive chemical speciation involving sequential extraction. Therefore, magnetism can be used as a new measure of both AD loading and Fe solubility via non-destructive measurements.
Graphical abstract Display Omitted
Highlights Magnetism of coarse aerosols in the Asian continental outflow was investigated, along with metal and isotopic compositions. Aerosol magnetization is primarily controlled by the magnetite content and remarkably enhanced during Asian dust events. Influence of Asian dust and anthropogenic emission can be identified simply by comparing aerosol mass and magnetization. Aerosol magnetization was also proposed as a new measure of Fe solubility.
Sources of aeolian magnetite at a remote site in Japan: Dominantly Asian desert dust or anthropogenic emissions?
Tsuchiya, Nozomu (Autor:in) / Kato, Shota (Autor:in) / Kawasaki, Kazuo (Autor:in) / Nakano, Takanori (Autor:in) / Kaneyasu, Naoki (Autor:in) / Matsuki, Atsushi (Autor:in)
Atmospheric Environment ; 314
14.09.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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