Long-term observations of black carbon mass concentrations at Fukue Island, western Japan, during 2009–2015: constraining wet removal rates and emission strengths from East Asia

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Kanaya, Yugo ; Pan, Xiaole ; Miyakawa, Takuma ; Komazaki, Yuichi ; Taketani, Fumikazu ; Uno, Itsushi ; Kondo, Yutaka (2016)
  • Publisher: Copernicus Publications
  • Journal: (issn: 1680-7324, eissn: 1680-7324)
  • Related identifiers: doi: 10.5194/acp-16-10689-2016
  • Subject: Chemistry | QD1-999 | Physics | QC1-999

Long-term (2009–2015) observations of atmospheric black carbon (BC) mass concentrations were performed using a continuous soot-monitoring system (COSMOS) at Fukue Island, western Japan, to provide information on wet removal rate constraints and the emission strengths of important source regions in East Asia (China and others). The annual average mass concentration was 0.36 µg m<sup>−3</sup>, with distinct seasonality; high concentrations were recorded during autumn, winter, and spring and were caused by Asian continental outflows, which reached Fukue Island in 6–46 h. The observed data were categorized into two classes, i.e., with and without a wet removal effect, using the accumulated precipitation along a backward trajectory (APT) for the last 3 days as an index. Statistical analysis of the observed ΔBC ∕ ΔCO ratios was performed to obtain information on the emission ratios (from data with zero APT only) and wet removal rates (including data with nonzero APTs). The estimated emission ratios (5.2–6.9 ng m<sup>−3</sup> ppb<sup>−1</sup>) varied over the six air mass origin areas; the higher ratios for south-central East China (30–35° N) than for north-central East China (35–40° N) indicated the relative importance of domestic emissions and/or biomass burning sectors. The significantly higher BC ∕ CO emission ratios adopted in the bottom-up Regional Emission inventory in Asia (REAS) version 2 (8.3–23 ng m<sup>−3</sup> ppb<sup>−1</sup>) over central East China and Korea needed to be reduced at least by factors of 1.3 and 2.8 for central East China and Korea, respectively, but the ratio for Japan was reasonable. The wintertime enhancement of the BC emission from China, predicted by REAS2, was verified for air masses from south-central East China but not for those from north-central East China. Wet removal of BC was clearly identified as a decrease in the ΔBC ∕ ΔCO ratio against APT. The transport efficiency (TE), defined as the ratio of the ΔBC ∕ ΔCO ratio with precipitation to that without precipitation, was fitted reasonably well by a stretched exponential decay curve against APT; a single set of fitting parameters was sufficient to represent the results for air masses originating from different areas. An accumulated precipitation of 25.5 ± 6.1 mm reduced the TE to 1∕<i>e</i>. BC-containing particles traveling to Fukue must have already been converted from hydrophobic to hydrophilic particles, because the behavior of TE against APT was similar to that of PM<sub>2.5</sub>, the major components of which are hydrophilic. Wet loss of BC greatly influenced interannual variations in the ΔBC ∕ ΔCO ratios and BC mass concentrations. This long-term data set will provide a benchmark for testing chemical transport/climate model simulations covering East Asia.
  • References (56)
    56 references, page 1 of 6

    AMAP: Arctic Monitoring and Assessment Programme, AMAP Assessment 2015: Black carbon and ozone as Arctic climate forcers, Oslo, Norway, vii C, 116 pp., 2015.

    Bond, T. C., Streets, D. G., Yarber, K. F., Nelson, S. M., Woo, J.-H., and Klimont, Z.: A technology-based global inventory of black and organic carbon emissions from combustion, J. Geophys. Res., 109, D14203, doi:10.1029/2003JD003697, 2004.

    Bond, T. C., Doherty, S. J., Fahey, D. W., Forster, P. M., Berntsen, T., DeAngelo, B. J., Flanner, M. G., Ghan, S., Karcher, B., Koch, D., Kinne, S., Kondo, Y., Quinn, P. K., Sarofim, M. C., Schultz, M. G., Schulz, M., Venkataraman, C., Zhang, H., Zhang, S., Bellouin, N., Guttikunda, S. K., Hopke, P. K., Jacobson, M. Z., Kaiser, J. W., Klimont, Z., Lohmann, U., Schwarz, J. P., Shindell, D., Storelvmo, T., Warren, S. G., and Zender, C. S.: Bounding the role of black carbon in the climate system: A scientific assessment, J. Geophys. Res.-Atmos., 118, 5380-5552, doi:10.1002/Jgrd.50171, 2013.

    China Statistical Yearbook 2014: National Bureau of Statistics of China, China Statistics Press, Beijing, 937 pp., ISBN-13: 978- 7503772801, 2014.

    Chuang, M-T., Lee, C-T., Chou, C. C-K., Lin, N-H., Sheu, G-R., Wang, J-L., Chang, S-C., Wang, S-H., Chi, K. H., Young, CY., Huang, H., Chen, H-W., Weng, G-H., Lai, S-Y., Hsu, S-P., Chang, Y-J., Chang, J-H., and Wu, X-C.: Carbonaceous aerosols in the air masses transported from Indochina to Taiwan: Longterm observation at Mt. Lulin, Atmos. Environ., 89, 507-516, 2014.

    Draxler, R. R. and Rolph, G. D.: HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) Model access via NOAA ARL READY Website, available at: http://www.arl.noaa.gov/ HYSPLIT.php (last access: 8 August 2016), NOAA Air Resources Laboratory, College Park, MD, 2013.

    Emmons, L. K., Walters, S., Hess, P. G., Lamarque, J.-F., Pfister, G. G., Fillmore, D., Granier, C., Guenther, A., Kinnison, D., Laepple, T., Orlando, J., Tie, X., Tyndall, G., Wiedinmyer, C., Baughcum, S. L., and Kloster, S.: Description and evaluation of the Model for Ozone and Related chemical Tracers, version 4 (MOZART-4), Geosci. Model Dev., 3, 43-67, doi:10.5194/gmd3-43-2010, 2010.

    Feng, J.: A 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models, Atmos. Environ., 41, 6808-6822, 2007.

    Ikeda, K., Yamaji, K., Kanaya, Y., Taketani, F., Pan, X., Komazaki, Y., Kurokawa, J., and Ohara T.: Sensitivity analysis of source regions of PM2:5 concentration at Fukue Island, J. Air Waste Manage. Assoc., 64, 445-452, 2014.

    IPCC: Climate Change 2013: The Physical Science Basis, Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2013.

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