Abstract：
:Eleven years (2005-2015) of data from long-term monitoring at a Japanese remote background site in Wajima, were analyzed to investigate temporal trends and sources. Water-soluble inorganic ions (WSIIs) were analyzed for aerosol chemical composition. The total WSIIs concentration was 7.93 ± 3.93 μg/m3, accounting for 42.3% of TSP mass, ranged from 11.4 to 93.9%. SO42- is the most abundant ion, contributing a total WSII mass from 18.0 to 79.8%, and non-sea-salt (nss-) SO42- contributed from 63.6% to 99.6% of total SO42-, which was related to human activities on the Asian continent and the effects of marine precursors in spring and summer, respectively. NO3- and NH4+ contribute 6.3 and 7.4% of the total WSIIs and were affected by long-range transport and local sources as well. The increasing trend of Na+ and Cl- indicates the increased influence of sea salt, which is caused by more frequent strong winds. K+ is mainly produced from biomass burning with a stable seasonal variation, Ca2+ as the characteristic ion of dust has the highest concentration in spring. Mg2+ comes from minerals and marine sources during spring and summer, respectively. This work describes in detail the annual change trend of the WSIIs of atmospheric particles in the Wajima area, seasonal characteristics, and source contributions, provide a comprehensive understanding of long-term variation in atmospheric particulate.
journal_name
Chemospherejournal_title
Chemosphereauthors
Zhou Q,Zhang L,Yang L,Zhang X,Xing W,Hu M,Chen B,Han C,Toriba A,Hayakawa K,Tang Ndoi
10.1016/j.chemosphere.2020.128427subject
Has Abstractpub_date
2021-02-01 00:00:00pages
128427issue
Pt 1eissn
0045-6535issn
1879-1298pii
S0045-6535(20)32622-9journal_volume
264pub_type
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