Hiroki Iwata

Hiroki Iwata
Assistant Professor, Shinshu University
affiliations: IARC/IJIS
email: hiwata attsymbol for nospam shinshu-u [dot] ac [dot] jp
phone: 907-474-7337



  • improve the synthesis study
  • develop new model using IJIS system
  • continue the field observation with Masahito Ueyama

Professional Interests

  • Turbulence in the atmospheric boundary layer
  • Energy and mass exchange between land and the atmosphere


  • Faculty of Environmental Science and Technology, Okayama University
  • Okayama University Graduate School of Natural Science and Technology
  • Graduate School of Life and Environmental Sciences, University of Tsukuba

Selected Publications

Nakai, T., Iwata, H., Harazono, Y., and Ueyama, M.: An inter-comparison between Gill and Campbell sonic anemometers, Agricultural and Forest Meteorology, 195-196, 123-131, 2014

Cable, J. M., Ogle, K., Bolton, W. R., Bentley, L. P., Romanovsky, V., Iwata, H., Harazono, Y., and Welker, J.: Permafrost thaw affects boreal deciduous plant transpiration through increased soil water, deeper thaw, and warmer soils, Ecohydrology, 7, 982-997, 2014

Iwata, H., Kosugi, Y., Ono, K., Mano, M., Sakabe, A., Miyata, A. and Takahashi, K.: Cross-validation of open-path and closed-path eddy-covariance techniques for observing methane fluxes, Boundary-Layer Meteorology, 151, 95-118, 2014

Ueyama, M., Iwata, H., and Harazono, Y.: Autumn warming reduces the CO2 sink of a black spruce forest in interior Alaska based on a nine-year eddy covariance measurement, Global Change Biology, 20, 1161-1173, 2014

Ueyama, M., Ichii, K., Iwata, H., Euskirchen, E. S., Zona, D., Rocha, A. V., Harazono, Y., Iwama, C., Nakai, T., and Oechel, W. C.: Upscaling terrestrial carbon dioxide fluxes in Alaska with satellite remote sensing and support vector regression, Journal of Geophysical Research: Biogeosciences, 118, 1266-1281, 2013

Ueyama, M., Iwata, H., Harazono, Y., Euskirchen, E. S., Oechel, W. C., and Zona, D.: Growing season and spatial variations of carbon fluxes of Arctic and boreal ecosystems in Alaska, Ecological Applications, 23, 1798-1816, 2013

Iwata, H., Ueyama, M., Iwama, C., and Harazono, Y.: A Variation in the fraction of absorbed photosynthetically active radiation and a comparison with MODIS data in burned black spruce forests of interior Alaska, Polar Science, 7, 113-124, 2013

Iwata, H., Harazono, Y., and Ueyama, M.: Sensitivity and offset changes of a fast-response open-path infrared gas analyzer during long-term observations in an Arctic environment, Journal of Agricultural Meteorology, 68, 175-181, 2012

Saito, K., Yamaguchi, S., Iwata, H., Harazono, Y., Kosugi, K., Lehning, M. and Shulski, M.: Climatic physical snowpack properties for large-scale modeling examined by observations and a physical model, Polar Science, 6, 79-95, 2012

Mizoguchi, Y., Ohtani, Y., Takanashi, S., Iwata, H., Yasuda, Y., and Nakai, Y.: Seasonal and interannual variation in net ecosystem production of an evergreen needleleaf forest, Journal of Forest Research, 17, 283-295, 2012.

Iwata, H., Harazono, Y., and Ueyama, M.: The role of permafrost in water exchange of a black spruce forest in Interior Alaska, Agricultural and Forest Meteorology 161, 107-115, 2012.

Marthews, T. R., Malhi, Y., and Iwata, H.: Calculating downward longwave radiation under clear and cloudy conditions over a tropical lowland forest site: an evaluation of model schemes for hourly data, Theoretical and Applied Climatology 107, 461-477, 2012.

Iwata, H., Harazono, Y., Ueyama, M., Tsuyuzaki, S., Kondo, M., and Uchida, M.: Quick recovery of carbon dioxide exchanges in a burned black spruce forest in Interior Alaska, SOLA 7, 105-108, 2011.

Nakai, T., Iwata, H., and Harazono, Y.: Importance of mixing ratio for a long-term CO2 flux measurement with a closed-path system, Tellus 63B, 302-308, 2011.

Mizoguchi, Y., Ohtani, Y., Nakai, Y., Iwata, H., Takanashi, S., Yasuda, Y., Nakano, T., Yasuda, T., Watanabe, T.: Climatic characteristics of the Fujiyoshida forest meteorology research site. Mount Fuji Research, 5, 1-6, 2011.

Iwata, H., Harazono, Y., and Ueyama, M.: Influence of source/sink distributions on flux-gradient relationships in the roughness sublayer over an open forest canopy under unstable conditions, Boundary-Layer Meteorology 136, 391-405, 2010.

Iwata, H., Asanuma, J., Ohtani, Y., Mizoguchi, Y., and Yasuda, Y.: Vertical length scale of transporting eddies for sensible heat in the unstable roughness sublayer over a forest canopy, Journal of Agricultural Meteorology 65, 1-9, 2009.

Iwata, H., Malhi, Y., and von Randow, C.: Gap-filling measurements of carbon dioxide storage in tropical rainforest canopy air space, Agricultural and Forest Meteorology 132, 305-314, 2005.