Observation of the simultaneous transport of Asian mineral dust aerosols with anthropogenic pollutants using a POPC during a long‐lasting dust event in late spring 2014

Autor:	Nobuo Sugimoto, Zifa Wang, Takaaki Shimohara, Hiroshi Kobayashi, Shigekazu Yamamoto, Itsushi Uno, Yukari Hara, Xiaole Pan, Masatoshi Kuribayashi
Rok vydání:	2015
Předmět:	Mineral dust Atmospheric sciences Plume chemistry.chemical_compound Geophysics Lidar Nitrate chemistry Climatology Depolarization ratio General Earth and Planetary Sciences Environmental science Particle size Moderate-resolution imaging spectroradiometer Particle counter
Zdroj:	Geophysical Research Letters. 42:1593-1598
ISSN:	1944-8007 0094-8276
DOI:	10.1002/2014gl062491
Popis:	We observed a long-lasting dust event from 25 May to 2 June 2014, using a polarization optical particle counter (POPC). The transport of dust plumes over East Asia was verified on the basis of observations of Moderate Resolution Imaging Spectroradiometer, a lidar network, and surface synoptic observation stations. Mixing of dust and anthropogenic pollutants was investigated according to the variation in the depolarization ratio as a function of particle size. The nonsphericity of dust particles varied due to the impact of anthropogenic pollutants on their pathway. In the coarse mode, dust particles always had a clear nonspherical configuration, although large amounts of nitrate were also present. Supermicron particles are occasionally present in a spherical configuration, possibly due to the complex mixing of natural dust and anthropogenic particles. Statistically, ~64% of the total nitrate mass was deemed to be transported from outside of Japan due to a trapping effect in the dust plume.
Databáze:	OpenAIRE
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