ADACHI Kouji

[Japanese]
Job title Senior Resercher/The 3rd lab./Department of Atmosphere, Ocean, and Earth System Modeling Research
E-mail adachik@mri-jma.go.jp
Expertise
    1) Education
    • April 2002 - March 2005 PhD, Graduate school of Sciences, Kobe University
    • April 2000 - March 2002, Msc, Graduate School of Human development and environment, Kobe University
    • April 1996-March 2000, Bsc. Faculty of human development, Kobe University
    2) Professional
    • April 2015 - Today: Senior Researcher, Meteorological Research Institute
    • April 2017 - March 2021: Visiting Associate Professor, Tokyo University of Science
    • April 2017 - September 2017: Researcher, Meteorological Research Institute
    • October 2011 - February 2012: Postdoctoral Researcher, Meteorological Research Institute
    • November 2010 - September 2011: Faculty researcher, Department of Chemistry and Biochemistry/School of Earth and Space Exploration, Arizona State University
    • April 2005 - October 2010: Postdoctoral Researcher, School of Earth and Space Exploration, Arizona State University
    Degree PhD
    Publications First Author (All publifications Google Scholar)
    • Adachi, K. , Dibb, J. E., Lee, M., Symonds, G., Kim, D., Campuzano-Jost, P., Jimenez, J. L., and Crawford, J. H.: Regional fireworks pollution over East and Southeast Asia from airborne observations around the Spring Festival period, ACS ES&T Air, 3, 2270–2278, https://doi.org/10.1021/acsestair.6c00106, 2026.
    • Adachi, K. , Yoshida, A., Mori, T., Moteki, N., Ohata, S., Kita, K., Kawai, Y., and Koike, M.: Individual particle compositions and aerosol mixing states at different altitudes over the ocean in East Asia, Atmos. Chem. Phys., 25, 12599–12613, https://doi.org/10.5194/acp-25-12599-2025, 2025.
    • Adachi, K. , Sun, C., Onchang, R., and Takegawa, N.: Homogeneous mixing of sea spray and biomass burning tracer elements within single particles observed over Southeast Asia, J. Geophys. Res.-Atmos., 130, e2024JD042328, https://doi.org/10.1029/2024JD042328, 2025.
    • Adachi, K. : Transmission Electron Microscopy for Studying Atmospheric Soot Particles, in: Microanalysis of Atmospheric Particles, 163–175, 2025.
    • Adachi, K. , Dibb, J. E., Katich, J. M., Schwarz, J. P., Guo, H., Campuzano-Jost, P., Jimenez, J. L., Peischl, J., Holmes, C. D., and Crawford, J. H.: Occurrence, abundance, and formation of atmospheric tarballs from a wide range of wildfires in the western US, Atmos. Chem. Phys., 24, 10985–11004, https://doi.org/10.5194/acp-24-10985-2024, 2024.
    • Adachi, K. , Tobo, Y., Oshima, N., Yoshida, A., Ohata, S., Krejci, R., Massling, A., Skov, H., and Koike, M.: Composition and mixing state of individual aerosol particles from northeast Greenland and Svalbard in the Arctic during spring 2018, Atmos. Environ., 314, 120083, https://doi.org/10.1016/j.atmosenv.2023.120083, 2023.
    • Adachi, K. , Tobo, Y., Koike, M., Pereira Freitas, G., Zieger, P., and Krejci, R.: Composition and mixing state of Arctic aerosol and cloud residual particles from long-term single-particle observations at Zeppelin Observatory, Svalbard, Atmos. Chem. Phys., 22, 14421–14439, https://doi.org/10.5194/acp-22-14421-2022, 2022.
    • Adachi, K. , Oshima, N., Takegawa, N., Moteki, N., and Koike, M.: Meteoritic materials within sulfate aerosol particles in the troposphere are detected with transmission electron microscopy, Commun. Earth Environ., 3, 134, https://doi.org/10.1038/s43247-022-00469-8, 2022.
    • Adachi, K. , Dibb, J. E., Scheuer, E., Katich, J. M., Schwarz, J. P., Perring, A. E., Mediavilla, B., Guo, H., Campuzano-Jost, P., Jimenez, J. L., Crawford, J. H., Soja, A. J., Oshima, N., Kajino, M., Kinase, T., Kleinman, L., Sedlacek, A. J., Yokelson, R. J., and Buseck, P. R.: Fine ash-bearing particles as a major aerosol component in biomass burning smoke, J. Geophys. Res.-Atmos., 127, e2021JD035657, https://doi.org/10.1029/2021JD035657, 2022.
    • Adachi, K. , Oshima, N., Ohata, S., Yoshida, A., Moteki, N., and Koike, M.: Compositions and mixing states of aerosol particles by aircraft observations in the Arctic springtime, 2018, Atmos. Chem. Phys., 21, 3607–3626, https://doi.org/10.5194/acp-21-3607-2021, 2021.
    • Adachi, K. , Oshima, N., Gong, Z., de Sá, S. S., Bateman, A. P., Martin, S. T., de Brito, J. F., Artaxo, P., Cirino, G. G., Sedlacek III, A. J., and Buseck, P. R.: Mixing states of Amazon basin aerosol particles transported over long distances using transmission electron microscopy, Atmos. Chem. Phys., 20, 11923–11939, https://doi.org/10.5194/acp-20-11923-2020, 2020.
    • Adachi, K. , Sedlacek, A. J., Kleinman, L., Springston, S. R., Wang, J., Chand, D., Hubbe, J. M., Shilling, J. E., Onasch, T. B., Kinase, T., Sakata, K., Takahashi, Y., and Buseck, P. R.: Spherical tarball particles form through rapid chemical and physical changes of organic matter in biomass-burning smoke, Proc. Natl. Acad. Sci. U.S.A., 116, 19336–19341, https://doi.org/10.1073/pnas.1900129116, 2019.
    • Adachi, K. , Sedlacek, A. J., Kleinman, L., Chand, D., Hubbe, J. M., and Buseck, P. R.: Volume changes upon heating of aerosol particles from biomass burning using transmission electron microscopy, Aerosol Sci. Technol., 52, 46–56, https://doi.org/10.1080/02786826.2017.1373181, 2018.
    • Adachi, K. , Moteki, N., Kondo, Y., and Igarashi, Y.: Mixing states of light-absorbing particles measured using a transmission electron microscope and a single-particle soot photometer in Tokyo, Japan, J. Geophys. Res.-Atmos., 121, 9153–9164, https://doi.org/10.1002/2016JD025153, 2016.
    • Adachi, K. and Buseck, P. R.: Changes in shape and composition of sea-salt particles upon aging in an urban atmosphere, Atmos. Environ., 100, 1–9, https://doi.org/10.1016/j.atmosenv.2014.10.036, 2015.
    • Adachi, K. , Zaizen, Y., Kajino, M., and Igarashi, Y.: Mixing state of regionally transported soot particles and the coating effect on their size and shape at a mountain site in Japan, J. Geophys. Res.-Atmos., 119, 5386–5396, https://doi.org/10.1002/2013JD020880, 2014.
    • Adachi, K. , Kajino, M., Zaizen, Y., and Igarashi, Y.: Emission of spherical cesium-bearing particles from an early stage of the Fukushima nuclear accident, Sci. Rep., 3, 2554, https://doi.org/10.1038/srep02554, 2013.
    • Adachi, K. and Buseck, P. R.: Changes of ns-soot mixing states and shapes in an urban area during CalNex, J. Geophys. Res.-Atmos., 118, 3723–3730, https://doi.org/10.1002/jgrd.50321, 2013.
    • Adachi, K. , Freney, E., and Buseck, P. R.: Shapes of internally mixed hygroscopic aerosol particles after deliquescence, and their effect on light scattering, Geophys. Res. Lett., 38, L13804, https://doi.org/10.1029/2011GL047540, 2011.
    • Adachi, K. and Buseck, P. R.: Atmospheric tar balls from biomass burning in Mexico, J. Geophys. Res.-Atmos., 116, D05204, https://doi.org/10.1029/2010JD015102, 2011.
    • Adachi, K. , Chung, S. H., and Buseck, P. R.: Shapes of soot aerosol particles and implications for their effects on climate, J. Geophys. Res.-Atmos., 115, D15206, https://doi.org/10.1029/2009JD012868, 2010.
    • Adachi, K. and Buseck, P. R.: Hosted and free-floating metal-bearing atmospheric nanoparticles in Mexico City, Environ. Sci. Technol., 44, 2299–2304, https://doi.org/10.1021/es902505b, 2010.
    • Adachi, K. and Buseck, P. R.: Internally mixed soot, sulfates, and organic matter in aerosol particles from Mexico City, Atmos. Chem. Phys., 8, 6469–6481, https://doi.org/10.5194/acp-8-6469-2008, 2008.
    • Adachi, K., Chung, S. H., Friedrich, H., and Buseck, P. R.: Fractal parameters of individual soot particles determined using electron tomography: Implications for optical properties, J. Geophys. Res.-Atmos., 112, D14202, https://doi.org/10.1029/2006JD008296, 2007.
    • Adachi, K.: Characterization of atmospheric dry deposition particulates in Kobe, Japan, Chemosphere, 64, 1311–1317, https://doi.org/10.1016/j.chemosphere.2005.12.055, 2006.
    • Adachi, K. and Tainosho, Y.: Single particle characterization of size-fractionated road sediments, Appl. Geochem., 20, 849–859, https://doi.org/10.1016/j.apgeochem.2005.01.005, 2005.
    • Adachi, K. and Tainosho, Y.: Characterization of heavy metal particles embedded in tire dust, Environ. Int., 30, 1009–1017, https://doi.org/10.1016/j.envint.2004.04.004, 2004.
    Coauthor (selected)
    • Kinase, T., Taketani, F., Tobo, Y., Takigawa, M., Adachi, K., et al.: Contribution of bioaerosols from terrestrial ecosystems to ice-nucleating particles over the Arctic Ocean, npj Climate and Atmospheric Science, 9, 51, https://doi.org/10.1038/s41612-025-01291-7, 2026.
    • Tobo, Y., Adachi, K., Kawai, K., et al.: Surface warming in Svalbard may have led to increases in highly active ice-nucleating particles, Communications Earth & Environment, 5, 516, https://doi.org/10.1038/s43247-024-01677-0, 2024.
    • Beeler, P., Kumar, J., Schwarz, J. P., Adachi, K., et al.: Light absorption enhancement of black carbon in a pyrocumulonimbus cloud, Nature Communications, 15, 6243, https://doi.org/10.1038/s41467-024-50070-0, 2024.
    • Li, W., Riemer, N., Xu, L., Wang, Y., Adachi, K., et al.: Microphysical properties of atmospheric soot and organic particles: measurements, modeling, and impacts, npj Climate and Atmospheric Science, 7, 65, https://doi.org/10.1038/s41612-024-00610-8, 2024.
    • Freitas, P. G., Adachi, K., Conen, F., et al.: Regionally sourced bioaerosols drive high-temperature ice nucleating particles in the Arctic, Nature Communications, 14, 5997, https://doi.org/10.1038/s41467-023-41696-7, 2023.
    • Chakrabarty, R. K., Shetty, N. J., Thind, A. S., Beeler, P., Sumlin, B. J., Zhang, C., Liu, P., Idrobo, J. C., Adachi, K., Wagner, N. L., et al.: Shortwave absorption by wildfire smoke dominated by dark brown carbon, Nature Geoscience, https://doi.org/10.1038/s41561-023-01237-9, 2023.
    • Kinase, T., Adachi, K., Oshima, N., Goto-Azuma, K., Ogawa-Tsukagawa, Y., Kondo, Y., et al.: Concentrations and size distributions of black carbon in the surface snow of eastern Antarctica in 2011, J. Geophys. Res.-Atmos., 125, e2019JD030737, https://doi.org/10.1029/2019JD030737, 2020.
    • Ching, J., Adachi, K., Zaizen, Y., Igarashi, Y., and Kajino, M.: Aerosol mixing state revealed by transmission electron microscopy pertaining to cloud formation and human airway deposition, npj Clim. Atmos. Sci., 2, 10, https://doi.org/10.1038/s41612-019-0081-9, 2019.
    • Kurisu, M., Adachi, K., Sakata, K., and Takahashi, Y.: Stable isotope ratios of combustion iron produced by evaporation in a steel plant, ACS Earth Space Chem., 3, 1864–1871, https://doi.org/10.1021/acsearthspacechem.8b00171, 2019.
    • Tobo, Y., Adachi, K., DeMott, P. J., Hill, T. C. J., Hamilton, D. S., Mahowald, N. M., Nagatsuka, N., Ohata, S., Uetake, J., Kondo, Y., and Koike, M.: Glacially sourced dust as a potentially significant source of ice nucleating particles, Nat. Geosci., 12, 253–258, https://doi.org/10.1038/s41561-019-0314-x, 2019.
    • Sedlacek, A. J., Buseck, P. R., Adachi, K., Onasch, T. B., Springston, S. R., and Kleinman, L.: Formation and evolution of tar balls from northwestern US wildfires, Atmos. Chem. Phys., 18, 11289–11301, https://doi.org/10.5194/acp-18-11289-2018, 2018.
    • Yoshida, A., Ohata, S., Moteki, N., Adachi, K., Mori, T., Koike, M., and Takami, A.: Abundance and emission flux of the anthropogenic iron oxide aerosols from the East Asian continental outflow, J. Geophys. Res.-Atmos., 123, 11194–11209, https://doi.org/10.1029/2018JD028665, 2018.
    • Ohata, S., Yoshida, A., Moteki, N., Adachi, K., Takahashi, Y., Kurisu, M., and Koike, M.: Abundance of light-absorbing anthropogenic iron oxide aerosols in the urban atmosphere and their emission sources, J. Geophys. Res.-Atmos., 123, 8115–8134, https://doi.org/10.1029/2018JD028363, 2018.
    • Freney, E., Sellegri, K., Chrit, M., Adachi, K., Brito, J., Waked, A., Borbon, A., Colomb, A., Dupuy, R., Pichon, J.-M., Bouvier, L., Delon, C., Jambert, C., Durand, P., Bourianne, T., Gaimoz, C., Triquet, S., Feron, A., Beekmann, M., Dulac, F., and Sartelet, K.: Aerosol composition and the contribution of SOA formation over Mediterranean forests, Atmos. Chem. Phys., 18, 7041–7056, https://doi.org/10.5194/acp-18-7041-2018, 2018.
    • Moteki, N., Adachi, K., Ohata, S., Yoshida, A., Harigaya, T., Koike, M., and Kondo, Y.: Anthropogenic iron oxide aerosols enhance atmospheric heating, Nat. Commun., 8, 15329, https://doi.org/10.1038/ncomms15329, 2017.
    • Abe, Y., Iizawa, Y., Terada, Y., Adachi, K., Igarashi, Y., and Nakai, I.: Detection of uranium and chemical state analysis of individual radioactive microparticles emitted from the Fukushima nuclear accident using multiple synchrotron radiation X-ray analyses, Anal. Chem., 86, 8521–8525, https://doi.org/10.1021/ac501998d, 2014.
    • Yokelson, R. J., Burling, I. R., Urbanski, S. P., Atlas, E. L., Adachi, K., Buseck, P. R., Wiedinmyer, C., Akagi, S. K., Toohey, D. W., and Wold, C. E.: Trace gas and particle emissions from open biomass burning in Mexico, Atmos. Chem. Phys., 11, 6787–6808, https://doi.org/10.5194/acp-11-6787-2011, 2011.
    • Yokelson, R. J., Crounse, J. D., DeCarlo, P. F., Karl, T., Urbanski, S., Atlas, E., Campos, T., Shinozuka, Y., Kapustin, V., Clarke, A. D., Weinheimer, A., Knapp, D. J., Montzka, D. D., Holloway, J., Weibring, P., Flocke, F., Zheng, W., Toohey, D., Wennberg, P. O., Wiedinmyer, C., Mauldin, L., Fried, A., Richter, D., Walega, J., Jimenez, J. L., Adachi, K., Buseck, P. R., Hall, S. R., and Shetter, R.: Emissions from biomass burning in the Yucatan, Atmos. Chem. Phys., 9, 5785–5812, https://doi.org/10.5194/acp-9-5785-2009, 2009.
    • Buseck, P. R. and Adachi, K.: Nanoparticles in the atmosphere, Elements, 4, 389–394, https://doi.org/10.2113/GSELEMENTS.4.6.389, 2008.
    • Yokelson, R. J., Urbanski, S., Atlas, E., Toohey, D., Alvarado, E., Crounse, J., Wennberg, P., Fischer, M., Wold, C., Campos, T., Adachi, K., Buseck, P. R., and Hao, W. M.: Emissions from forest fires near Mexico City, Atmos. Chem. Phys., 7, 5569–5584, https://doi.org/10.5194/acp-7-5569-2007, 2007.
    Project
      PI grant projects
      • Influence of mixing states of naturally occurring aerosol particles on cloud formation as ice nucleating particles, Grant-in-Aid for Scientific Research (B), 2023-2026
      • Emission and removal of solid organic aerosol particles from biomass burning and their climate effects, Grant-in-Aid for Scientific Research (B), 2019-2023
      • Nano-scale analyses of structures and chemical compositions of ice nucleating particles, Challenging Research (Exploratory), 2019-2023
      • Single particle analysis of light absorbing organic aerosols, Grant-in-Aid for Young Scientists (B), 2016-2019