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• W2989804916 abstract "The present study is the first report of the oxidative potential (OP) of atmospheric PM10 over marine environments. PM10 samples were collected onboard the Fishery Oceanographic Research Vessel Sagar Sampada (SS#359) over the Arabian Sea during April–May, 2017 and analyzed for a variety of chemical species and OPs. The PM10 mass concentration, volume-normalized OP [represented as nmol dithiothreitol (DTT) min–1 m–3 or OPV], and mass-normalized OP (represented as pmol DTT min–1 μg–1 or OPM) over the study region varied from 61 to 184 μg m–3, 0.69 to 2.08 nmol DTT min–1 m–3, and 6 to 26 pmol DTT min–1 μg–1, respectively. The study period was classified into two categories (Class-A and Class-B) based on 5-day air mass back trajectories for each sampling location. The mass fraction of mineral dust was ∼2.5 times higher in Class-B samples (representing the Arabian Desert/marine air masses) in comparison with Class-A samples (representing the continental air mass). The average OPV and OPM associated with Class-A showed ∼1.5 times higher values as compared to those associated with Class-B. Furthermore, Class-A samples showed ∼95% Cl– depletion from sea salt aerosol, which was also found to be significantly correlated with OPM. These observations suggest the importance of free acidity not only in affecting the chemistry of marine atmosphere but also in catalytic generation of reactive oxygen species. Moreover, water-soluble organic nitrogen (WSON) contributes ∼15% to total nitrogen, and the mass fraction of WSON was observed to be positively correlated (R = 0.79) with OPM, suggesting that water-soluble (WS) nitrogenous organics are highly DTT-active. Further, OPM also exhibited a significant correlation (R = 0.83) with nss-K+, indicating the effect of biomass burning emissions on aerosol OP. In addition, the mass fraction of WS-Mn, WS-Cu, and WS-Zn also correlated significantly with OPM. Our results also infer that aerosol aging increases their OP. These results have important implications in assessing the effects of continental aerosol on marine atmospheric boundary layer and ocean biogeochemistry." @default.
• W2989804916 created "2019-12-05" @default.
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• W2989804916 date "2019-11-27" @default.
• W2989804916 modified "2023-10-02" @default.
• W2989804916 title "Chemical Composition and Oxidative Potential of Atmospheric PM₁₀ over the Arabian Sea" @default.
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• W2989804916 doi "https://doi.org/10.1021/acsearthspacechem.9b00285" @default.
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