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Atmospheric Deposition Modeling of Polychlorinated Dibenzo-p-dioxins, Dibenzofurans and Polychlorinated Biphenyls in the Ambient Air of Southern Taiwan. Part I. Dry Depositions
並列摘要
Atmospheric deposition, including dry and wet deposition, is a primary pathway for the transfer of POPs to terrestrial and aquatic ecosystems. In this study (that is, the part I.), the characteristics of PCDD/Fs and PCBs in the ambient air of Tainan City were simulated by the PM_(10) versus PCDD/Fs concentration regression analysis, gas-particle partition modeling, and the simulation of dry deposition. Dry deposition fluxes are obtained from the combination of the PCDD/F and PCB concentrations, meteorological information, dry deposition velocities, and scavenging ratios. The dry deposition fluxes of PCDD/F-TEQ2005 increase with decreasing temperature, while increase with a higher degree of chlorine numbers on PCDD/F homologues. In this study (that is, the part I.), the average PCDD/F dry deposition fluxes in spring, summer, fall and winter were 69.3, 28.2, 129 and 246 pg WHO-TEQ/m^2-month during 2012, respectively. As for 2013, the average PCDD/F dry deposition fluxes in spring, summer, fall and winter were 67.0, 29.8, 102 and 377 pg WHO-TEQ/m^2-month, respectively. The average PCB dry deposition fluxes in spring, summer, fall and winter were 2.16, 1.99, 5.70 and 11.9 pg WHO-TEQ/m^2-month during 2012, respectively. As for 2013, the average PCB dry deposition fluxes in spring, summer, fall and winter were 2.11, 1.27, 4.49 and 8.88 pg WHO-TEQ/m^2-month, respectively. The minimum simulated value occurred in summer, while the maximum dry deposition fluxes, which were about 4-5 times higher than the minimum values, occurred in winter. The lower values observed in summer may be caused by the atmospheric diffusion of SVOCs and high rainfall intensity.
延伸閱讀
- R., C. S., Lee, W. J., M.P., E. M., Mwangi, J. K., Wang, L. C., Lin, N. H., & Chien, G. P. C. (2015). Atmospheric Deposition of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans at Coastal and High Mountain Areas in Taiwan. Aerosol and Air Quality Research, 15(4), 1390-1411. https://doi.org/10.4209/aaqr.2015.04.0246
- Mi, H. H., Wu, Z. S., Lin, L. F., Lai, Y. C., Lee, Y. Y., Wang, L. C., & Chien, G. P. C. (2012). Atmospheric Dry Deposition of Polychlorinated Dibenzo-p-Dioxins/Dibenzofurans (PCDD/Fs) and Polychlorinated Biphenyls (PCBs) in Southern Taiwan. Aerosol and Air Quality Research, 12(5), 1016-1029. https://www.airitilibrary.com/Article/Detail?DocID=16808584-201210-201209180026-201209180026-1016-1029
- Tang, S. T., Chang, Y., Zhu, J., & Lin, S. L. (2018). Atmospheric Deposition Impact of Polychlorinated Dibenzo-p-dioxin and Dibenzofuran on an Aquatic System in Central Taiwan. Aerosol and Air Quality Research, 18(4), 981-993. https://doi.org/10.4209/aaqr.2018.03.0100
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