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- W2796891808 abstract "Abstract. Arsenic (As) has long been recognized as a toxic element of mainly anthropogenic origins, having adverse effects on human health. However, there is insufficient understanding regarding As released into atmosphere from biomass burning (BB). To this end, daily airborne As concentrations in total particulate matter (TSP) were determined at Mount Hehuan (24.16° N, 121.29° E, 3001 m a.s.l.), Taiwan from September 2011 to September 2012. During the sampling period, As concentrations varied from 0.02 to 5.9 ng m−3, with a mean value of 0.5 ± 1.0 ng m−3. Significant seasonality of As was found over the subtropical free troposphere, with a maximum concentration in the springtime. Based on backward trajectory analyses and WRF-Chem model simulations, we found the high As concentrations during the spring period were attributed to the biomass burning activities over South (S) Asia where ground water, soil and crops are severely contaminated by arsenic. A good correlation (r = 0.73 p 0.2) were also observed, indicating that burning crops contaminated by lead arsenate could be a crucial candidate for extremely high As concentrations at Mount Hehuan. Finally, the net influence of BB activities on airborne As concentrations has been simply estimated by comparing the differences of As concentrations between BB and non-BB days. The result showed, on average, the contribution of BB activities over S Asia to airborne As was approximately 1.0 ng m−3, which accounted 63 % for total airborne As concentrations in the springtime. Moreover, a ratio of ΔAs/ΔCO (~ 0.00001) in the S Asian BB events was obtained. Using this value, arsenic emissions from S Asian BB activities were estimated to be 0.17 tons yr−1, causing extremely high airborne As concentrations over the subtropical free troposphere, and impacted As cycles on a regional scale." @default.
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- W2796891808 date "2018-04-12" @default.
- W2796891808 modified "2023-10-16" @default.
- W2796891808 title "Enhancements of Airborne Particulate Arsenic over the Subtropical Free Troposphere in the Springtime: Impact by South Asian Biomass Burning" @default.
- W2796891808 doi "https://doi.org/10.5194/acp-2018-108" @default.
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