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Kazuyuki Miyazaki

Photo of Kazuyuki Miyazaki


4800 Oak Grove Drive
M/S 233-200

Pasadena, CA 91109



Curriculum Vitae:

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Member of:

Tropospheric Composition



Kazuyuki Miyazaki is a scientist who specializes in atmospheric composition research. His research activities range from the development of chemical data assimilation systems to the study of the impact of air quality on climate and human health. He produced decadal chemical reanalyses based on assimilation of multi-constituent satellite measurements ( The global reanalysis concentration and emission data products provided unique information on decadal changes in the atmospheric environment that can be used for various applications in air quality and climate research. He is a PI of the NASA Aura Science team and JPL Science Understanding from Data Science projects. His current research includes observing system simulation experiments (OSSEs), evaluations of satellite data products and chemistry-climate models, and air quality and greenhouse gas emission analysis.


  • Ph.D. Geophysics, Tohoku University (2006)

Professional Experience

  • Scientist, Jet Propulsion Laboratory, California Institute of Technology (2019-present)
  • Research Scholar, Jet Propulsion Laboratory, California Institute of Technology (2016-2017)
  • Visiting Project Scientist, Joint Institute for Regional Earth System Science and Engineering (JIFRESSE), UCLA (2022-present)
  • Visiting Senior Scientist, Japan Agency for Marine-Earth Science and Technology (2019-present)
  • Deputy Group Leader, Japan Agency for Marine-Earth Science and Technology (2017-2019)
  • Senior Scientist, Japan Agency for Marine-Earth Science and Technology (2013-2019)
  • Research Scientist, Japan Agency for Marine-Earth Science and Technology (2011-2012)
  • Postdoctoral Scientist, Japan Agency for Marine-Earth Science and Technology (2006-2010)
  • Committee member, the IGPB・WCRP・DIVERSITAS subcommittee, Ministry of Education, Culture, Sports, Science and Technology, Japan (2015-2019)
  • Expert investigator, National Institute of Science and Technology Policy (2013-2017)
  • Visiting Scientist, International Pacific Research Center (IPRC), University of Hawaiʻi (2012-2013)
  • Visiting Scientist, Chemistry and Climate Division, Royal Netherlands Meteorological Institute (KNMI) (2010-2012)
  • Research Fellow, Category DC1: for excellent Ph.D. students, The Japan Society for the Promotion of Science for Young Scientists (2003-2006)

Community Service

  • WMO workshop on the Impact of Various Observing Systems on NWP and Earth System Prediction, SOC
  • IGAC AMIGO (Analysis of eMIssions usinG Observations), Steering members, 2019-present
  • IGAC Tropospheric Ozone Assessment Report, Phase II (TOAR-II, 2020-2024), Chemical Reanalysis Focus working group lead, 2021-present
  • NCAR MULTI-SCALE CHEMISTRY MODELING (MUSICA), Evaluation and Data Assimilation working group, 2021-present
  • Reviewer for journal articles and grant proposals
  • GOSAT-GW science team member, 2022-present
  • GEMS L1/L2 validation team member, 2020-present
  • ESA Mission ESP-MACCS Science Advisory Group member, 2019-present

Research Interests

  • Multi-constituent data assimilation of chemically reactive and carbon gases for air quality, carbon cycle, and climate studies
  • Long-term changes in atmospheric compositions and emissions
  • Formation and evaluation of satellite mission concepts through chemical data assimilation and Observing system simulation experiments (OSSEs)
  • Synergetic use of satellite, aircraft, and ground-based measurements and models
  • Evaluation of new satellite data products and chemistry-climate models

Selected Awards

  • NASA Exceptional Scientific Achievement Medal (2022)
  • NASA group achievement award for MUSES algorithm team (2020)
  • JPL team bonus award for COVID-19 air quality research (2020)
  • NASA group achievement Award to KORUS-AQ (2017)
  • Yamamoto-Shono Award from the Meteorological Society of Japan (2012)
  • Young Scientist Award from the Japan Society of Atmospheric Chemistry (2009)
  • JAMSTEC award for Outstanding Research Accomplishments (2009)
  • Best poster award, 5th International Workshop on Global Change: Connection to the Arctic (GCCA5) (2004)
  • Japanese Government Scholarship, Ministry of Education, Culture, Sports, Science and Technology (1999-2003)

Selected Publications

  1. Miyazaki, K., J. L. Neu, G. Osterman, K. Bowman, Changes in U.S. background ozone associated with the 2011 turnaround in Chinese NOx emissions, Environmental Research Communications,, 2022.
  2. J. L. Laughner, J. L. Neu, D. Schimel, P. O. Wennberg, K. Barsanti, K. W. Bowman, A. Chatterjee, B. E. Croes, H. L. Fitzmaurice, D. K. Henze, J. Kim, E. A. Kort, Z. Liu, K. Miyazaki, A. Turner, S. Anenberg, J. Avise, H. Cao, D. Crisp, J. de Gouw, A. Eldering, J. C. Fyfe, D. L. Goldberg, K. R. Gurney, S. Hasheminassab, F. Hopkins, C. E. Ivey, D. B. A. Jones, J. Liu, N. S.Lovenduski, R. V. Martin, G. A. McKinley, L. Ott, B. Poulter, M. Ru, S. P. Sander, N. Swart, Y. L. Yung, Z.-C. Zeng, Societal shifts due to COVID-19 reveal large-scale complexities and feedbacks between atmospheric chemistry and climate change, Proceedings of the National Academy of Sciences Nov 2021, 118 (46) e2109481118; DOI:10.1073/pnas.2109481118, 2021
  3. Byrne, B., Liu, J., Lee, M., Yin, Y., Bowman, K. W., Miyazaki, K., et al. (2021). The carbon cycle of southeast Australia during 2019–2020: Drought, fires, and subsequent recovery. AGU Advances, 2, e2021AV000469.
  4. Miyazaki, K., K. Bowman, T. Sekiya, M. Takigawa, J. Neu, K. Sudo, G. Osterman, H. Eskes, Global tropospheric ozone responses to reduced NOx emissions linked to the COVID-19 world-wide lockdowns, Science Advances, Vol. 7, no. 24, eabf7460, DOI: 10.1126/sciadv.abf7460, 2021
  5. Gaubert, B., Emmons, L. K., Raeder, K., Tilmes, S., Miyazaki, K., Arellano Jr., A. F., Elguindi, N., Granier, C., Tang, W., Barré, J., Worden, H. M., Buchholz, R. R., Edwards, D. P., Franke, P., Anderson, J. L., Saunois, M., Schroeder, J., Woo, J.-H., Simpson, I. J., Blake, D. R., Meinardi, S., Wennberg, P. O., Crounse, J., Teng, A., Kim, M., Dickerson, R. R., He, H., Ren, X., Pusede, S. E., and Diskin, G. S.: Correcting model biases of CO in East Asia: impact on oxidant distributions during KORUS-AQ, Atmos. Chem. Phys., 20, 14617-14647,>, 2020.
  6. Miyazaki, K., Bowman, K., Sekiya, T., Jiang, Z., Chen, X., Eskes, H., Ru, M., Zhang, Y., Shindell, D., (2020). Air quality response in China linked to the 2019 novel coronavirus (COVID‐19) lockdown. Geophysical Research, Letters, 47, e2020GL089252.
  7. Elguindi, N., Granier, C., Stavrakou, T., Darras, S., Bauwens, M., Cao, H., Chen, C., Denier van der Gon, H.A.C., Dubovik, O., Fu, T.M., Henze, D.K., Jiang, Z., Keita, S., Kuenen, J.J.P., Kurokawa, J., Liousse, C., Miyazaki, K., Müller, J.‐F., Qu, Z., Solmon, F. and Zheng, B. (2020), Intercomparison of Magnitudes and Trends in Anthropogenic Surface Emissions From Bottom‐Up Inventories, Top‐Down Estimates, and Emission Scenarios. Earth's Future, 8: e2020EF001520.
  8. Miyazaki, K., Bowman, K., Sekiya, T., Eskes, H., Boersma, F., Worden, H., Livesey, N., Payne, V. H., Sudo, K., Kanaya, Y., Takigawa, M., and Ogochi, K.: Updated tropospheric chemistry reanalysis and emission estimates, TCR-2, for 2005-2018, Earth Syst. Sci. Data, 12, 2223-2259,, 2020b.
  9. Miyazaki, K., Bowman, K. W., Yumimoto, K., Walker, T., and Sudo, K.: Evaluation of a multi-model, multi-constituent assimilation framework for tropospheric chemical reanalysis, Atmos. Chem. Phys., 20, 931-967,, 2020a.
  10. Kuai, L., Bowman, K. W., Miyazaki, K., Deushi, M., Revell, L., Rozanov, E., Paulot, F., Strode, S., Conley, A., Lamarque, J.-F., Jöckel, P., Plummer, D. A., Oman, L. D., Worden, H., Kulawik, S., Paynter, D., Stenke, A., and Kunze, M.: Attribution of Chemistry-Climate Model Initiative (CCMI) ozone radiative flux bias from satellites, Atmos. Chem. Phys., 20, 281-301,, 2020.
  11. Itahashi, S., K. Yumimoto, J Kurokawa, Y. Morino, T Nagashima, K. Miyazaki, T. Maki and T. Ohara, Inverse estimation of NOx emissions over China and India 2005-2016: contrasting recent trends and future perspectives, Environmental Research Letters, 14(12), 124020, 2019
  12. Thompson, A. M., R. M. Stauffer, T. P. Boyle, D. E. Kollonige, K. Miyazaki, M. Tzortziou, J. R. Herman, C. E. Jordan, B. T. Lamb, Comparison of Near-surface NO2 Pollution with Pandora Total Column NO2 during the Korea-United States Ocean Color (KORUS OC) Campaign, Journal of Geophysical Research: Atmospheres, 124, 13560- 13575., 2019.
  13. Huijnen, V., K. Miyazaki, J. Flemming, A. Inness, T. Sekiya, and M. Schultz, An inter-comparison of CAMS and TCR tropospheric ozone reanalysis products, Atmos. Chem. Phys. Discuss., in review, 2019.
  14. Koshin, D., K. Sato, K. Miyazaki, and S. Watanabe, An ensemble Kalman filter data assimilation system for the whole neutral atmosphere, Geosci. Model Dev. Discuss., in review
  15. He., T.-L., H.E., D. B. A. Jones, B. Huang, Y. Liu, K. Miyazaki, Z. Jiang, E. C. White, H. M. Worden, and J. R. Worden, Recurrent U-net: Deep learning to predict daily summertime ozone in the United States. arXiv preprint arXiv:1908.05841, 2019.
  16. Kanaya, Y., Miyazaki, K., Taketani, F., Miyakawa, T., Takashima, H., Komazaki, Y., Pan, X., Kato, S., Sudo, K., Sekiya, T., Inoue, J., Sato, K., and Oshima, K.: Ozone and carbon monoxide observations over open oceans on R/V Mirai from 67° S to 75° N during 2012 to 2017: testing global chemical reanalysis in terms of Arctic processes, low ozone levels at low latitudes, and pollution transport, Atmos. Chem. Phys., 19, 7233-7254,, 2019.
  17. Miyazaki, K., Sekiya, T., Fu, D., Bowman, K. W., Kulawik, S. S., Sudo, K., et al., Balance of emission and dynamical controls on ozone during the Korea‐United States Air Quality campaign from multiconstituent satellite data assimilation. Journal of Geophysical Research: Atmospheres, 124, 387-413., 2019.
  18. Jiang, Z., B. C McDonald, H. M Worden, J. R Worden, K. Miyazaki, Z. Qu, D. K. Henze, D. Jones, A. Arellano, E. Fischer, L. Zhu, F. Boersma, Unexpected slowdown of US pollutant emission reduction in the past decade, Proc. Natl. Acad. Sci. USA,, 2018
  19. Sekiya, T., Miyazaki, K., Ogochi, K., Sudo, K., and Takigawa, M.: Global high-resolution simulations of tropospheric nitrogen dioxide using CHASER V4.0, Geosci. Model Dev., 11, 959-988,, 2018.
  20. Miyazaki, K., Eskes, H., Sudo, K., Boersma, K. F., Bowman, K., and Kanaya, Y.: Decadal changes in global surface NOx emissions from multi-constituent satellite data assimilation, Atmos. Chem. Phys., 17, 807-837,, 2017.
  21. Miyazaki, K. and Bowman, K.: Evaluation of ACCMIP ozone simulations and ozonesonde sampling biases using a satellite-based multi-constituent chemical reanalysis, Atmos. Chem. Phys., 17, 8285-8312,, 2017.
  22. Miyazaki, K., Iwasaki, T., Kawatani, Y., Kobayashi, C., Sugawara, S., and Hegglin, M. I.: Inter-comparison of stratospheric mean-meridional circulation and eddy mixing among six reanalysis data sets, Atmos. Chem. Phys., 16, 6131-6152,, 2016.
  23. Miyazaki, K., Iwasaki, T., Kawatani, Y., Kobayashi, C., Sugawara, S., and Hegglin, M. I.: Inter-comparison of stratospheric mean-meridional circulation and eddy mixing among six reanalysis data sets, Atmos. Chem. Phys., 16, 6131-6152,, 2016.
  24. Miyazaki, K., Eskes, H. J., and Sudo, K.: A tropospheric chemistry reanalysis for the years 2005-2012 based on an assimilation of OMI, MLS, TES, and MOPITT satellite data, Atmos. Chem. Phys., 15, 8315-8348,, 2015.
  25. Miyazaki, K., Eskes, H. J., Sudo, K., and Zhang, C.: Global lightning NOx production estimated by an assimilation of multiple satellite data sets, Atmos. Chem. Phys., 14, 3277-3305,, 2014.
  26. Miyazaki, K., and H. Eskes, Constraints on surface NOx emissions by assimilating satellite observations of multiple species, Geophys. Res. Lett., 40,, 2013.
  27. Miyazaki, K., Eskes, H. J., and Sudo, K., Global NOx emission estimates derived from an assimilation of OMI tropospheric NO2 columns, Atmos. Chem. Phys., 12, 2263-2288,, 2012.
  28. Miyazaki, K., H. J. Eskes, K. Sudo, M. Takigawa, M. van Weele, and K. F. Boersma, Simultaneous assimilation of satellite NO2, O3, CO, and HNO3 data for the analysis of tropospheric chemical composition and emissions, Atmos. Chem. Phys., 12, 9545-9579,, 2012.
  29. Miyazaki K., T. Maki, P. K. Patra, and T. Nakazawa, CO2 fluxes estimated with satellite, aircraft, and surface observations using an ensemble-based 4D data assimilation system, J. Geophys. Res., 116, D16306,, 2011.
  30. Miyazaki K., S. Watanabe, Y. Kawatani, Y. Tomikawa, K. Sato, and M. Takahashi, Transport and mixing in the extratropical tropopause region in a high vertical resolution GCM. Part I: Potential vorticity and heat budget analysis, J. Atmos. Sci., 67, No. 5, 1293-1314, 2010.
  31. Miyazaki K., K. Sato, S. Watanabe, Y. Kawatani, Y. Tomikawa, and M. Takahashi, Transport and mixing in the extratropical tropopause region in a high vertical resolution GCM. Part II: Relative importance of large-scale and small-scale dynamics, J. Atmos. Sci., 67, No. 5, 1315-1336, 2010.
  32. Miyazaki, K., T. Machida, P.K. Patra, T. Iwasaki, Y. Sawa, H. Matsueda, and T. Nakazawa, Formation mechanisms of latitudinal CO2 gradient in the upper troposphere over the subtropics and tropics, J. Geophys. Res., 114, D03306,, 2009.
  33. Miyazaki, K., and T. Iwasaki, Isentropic diffusion coefficient derived from chemical constituent data, Scientific Online Letters on the Atmosphere, Vol. 5, 009-012,, 2009.
  34. Miyazaki, K., Performance of a local ensemble transform Kalman filter for the analysis of atmospheric circulation and distribution of long-lived tracers under idealized conditions, J. Geophys. Res., 114, D19304,, 2009.
  35. Miyazaki, K., P. K. Patra, M. Takigawa, T. Iwasaki, and T. Nakazawa, Global-scale transport of carbon dioxide in the troposphere, J. Geophys. Res., 113, D15301,, 2008.