論文 FLUXNET-CH4 Synthesis Activity: Objectives, Observations, and Future Directions Bulletin of the American Meteorological Society,in press 2019(Jul.) Author:Knox, S. H., Jackson, R. B., Poulter, B, McNicol, G., Fluet-Chouinard, E., Zhang, Z., Hugelius, G., Bousquet, P., Canadell, J. G., Saunois, M., Papale, D., Chu, H., Keenan, T. F., Baldocchi, D., Mammarella, I., Trotta, C., Aurela, M., Bohrer, G., Campbell, D., Cescatti, A., Chamberlain, S., Chen, J., Dengel, S., Desai, A. R., Euskirchen, E., Friborg, T., Goded, I., Goeckede, M., Heimann, M., Helbig, M., Hirano, T., Hollinger, D., Iwata, H., Kang, M., Klatt, J., Krauss, K. W., Kutzbach, L., Lohila, A., Magliulo, V., Mitra, B., Morin, T. H., Nilsson, M. B., Niu, S., Noormets, A., Oechel, W. C., Peichl, M., Peltola, O., Reba, M. L., Richardson, A., Runkle, B. R. K., Ryu, Y., Sachs, T., Schäfer, K. V. R., Schmid, H. P., Shurpali, H., Sonnentag, O., Tang, A. C. I., Torn, M., Ueyama, M., Vargas, R., Vesala, T., Ward, E. J., Windham-Myers, L., Wohlfahrt, G., and Zona, D.
Carbon dioxide balance in early-successional forests after forest fires in interior Alaska Agricultural and Forest Meteorology,275:196-207 2019(May) Author:Ueyama, M., Iwata, H., Nagano, H., Tahara, N., Iwama, C., Harazono, Y.
Partitioning eddy-covariance methane fluxes from a shallow lake into diffusive and ebullitive fluxes Boundary-Layer Meteorology,169:413-428 2018(Jun.) Author:Iwata, H., Hirata, R., Takahashi, Y., Miyabara, Y., Itoh, M., and Iizuka, K.
Leaf- and ecosystem-scale photosynthetic parameters for the overstory and understory
of boreal forests in interior Alaska Journal of Agricultural Meteorology,74(2):79-86 2018(Apr.) Author:Ueyama, M., Tahara, N., Nagano, H., Makita, N., Iwata, H., and Harazono, Y.
Exploring sub-daily to seasonal variations in methane exchange in a single-crop rice paddy in central Japan Atmospheric Environment,179:156-165 2018(Feb.) Author:Iwata, H., Mano, M., Ono, K., Tokida, T., Kawazoe, T., Kosugi, Y., Sakabe, A., Takahashi, K., and Miyata, A.
Evaluating the relationship between wildfire extent and nitrogen dry deposition in a boreal forest in interior Alaska Polar Science,11:96-104 2017(Mar.) Author:Nagano, H. and Iwata, H.
A multi-scale comparison of modeled and observed seasonal methane emissions in northern wetlands Biogeosciences,13:5043-5056 2016(Aug.) Author:Xu, X., Riley, W. J., Koven, C. D., Billesbach, D. P., Chang, R. Y.-W., Commane, R., Euskirchen, E. S., Hartery, S., Harazono, Y., Iwata, H., McDonald, K. C., Miller, C. E., Oechel, W. C., Poulter, B., Raz-Yaseef, N., Sweeney, C., Torn, M., Wofsy, S. C., Zhang, Z., and Zona D.
Optimization of a biochemical model with eddy covariance measurements in black spruce forests of Alaska for estimating CO2 fertilization effects Agricultural and Forest Meteorology,222:98-111 2016(Mar.) Author:Ueyama, M., Tahara, T., Iwata, H., Euskirchen, E. S., Ikawa, H., Kobayashi, H., Nagano, H., Nakai, T., Harazono, Y.
Latitudinal gradient of spruce forest understory and tundra phenology in Alaska as observed from satellite and ground-based data Remote Sensing of Environment,177:160-170 2016(Feb.) Author:Kobayashi, H., Yunus, A. P., Nagai, S., Sugiura, K., Kim, Y., Van Dam, B., Nagano, H., Zona, D., Harazono, Y., Bret-Harte, M. S., Ichii, K., Ikawa, H., Iwata, H., Oechel, W. C., Ueyama, M., Suzuki, R.
Methane exchange in a poorly-drained black spruce forest over permafrost observed using the eddy covariance technique Agricultural and Forest Meteorology,214-215:157-168 2015(Aug.) Author:Iwata, H., Harazono, Y., Ueyama, M., Sakabe, A., Nagano, H., Kosugi, Y., Takahashi, K., Kim, Y.
Temperature regimes and turbulent heat fluxes across a heterogeneous canopy in an Alaskan boreal forest Journal of Geophysical Research - Atmospheres,120(4):1348-1360 2015 Author:Starkenburg, D., Fochesatto, G. J., Cristobal, J., Prakash, A., Gens, R., Alfieri, J., Nagano, H., Harazono, Y., Iwata, H., and Kane, D. L.
Effects of water vapor dilution on trace gas flux, and practical correction methods Journal of Agricultural Meteorology,71(2):65-76 2015 Author:Harazono, Y., Iwata, H., Sakabe, A., Ueyama, M., Takahashi, K., Nagano, H., Nakai, T., and Kosugi, Y.
Change in surface energy balance in Alaska due to fire and spring warming, based on upscaling eddy covariance measurements Journal of Geophysical Research - Biogeosciences,119:1947-1969 2014 Author:Ueyama, M., Ichii, K., Iwata, H., Euskirchen, E. S., Zona, D., Rocha, A. V., Harazono, Y., Iwama, C., Nakai, T., and Oechel, W. C.
An inter-comparison between Gill and Campbell sonic anemometers Agricultural and Forest Meteorology,195-196:123-131 2014 Author:Nakai, T., Iwata, H., Harazono, Y., and Ueyama, M.
Permafrost thaw affects boreal deciduous plant transpiration throught increased soil water, deeper thaw, and warmer soils Ecohydrology,7:982-997 2014 Author:Cable, J. M., Ogle, K., Bolton, W. R., Bentley, L. P., Romanovsky, V., Iwata, H., Harazono, Y., and Welker, J.
Cross-validation of open-path and closed-path eddy-covariance techniques for observing methane fluxes Boundary-Layer Meteorology,151:95-118 2014 Author:Iwata, H., Kosugi, Y., Ono, K., Mano, M., Sakabe, A., Miyata, A., and Takahashi, K.
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 Author:Ueyama, M., Iwata, H., and Harazono, Y.
Upacaling terrestrial carbon dioxide fluxes in Alaska with satellite remote sensing and support vector regression Journal of Geophysical Research: Biogeosciences,118:1266-1281 2013 Author:Ueyama, M., Ichii, K., Iwata, H., Euskirchen, E. S., Zona, D., Rocha, A. V., Harazono, Y., Iwama, C., Nakai, T., and Oechel, W.
Growing season and spatial variations of carbon fluxes of Arctic and boreal ecosystems in Alaska Ecological Applications,23:1798-1816 2013 Author:Ueyama, M., Iwata, H., Harazono, Y., Euskirchen, E. S., Oechel, W. C., and Zona, D.
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 Author:Iwata, H., Ueyama, M., Iwama, C., and Harazono, Y.
Sensitivity and offset changes of a fast-response open-path gas analyzer during long-term observations in an Arctic environment Journal of Agricultural Meteorology,68:175-181 2012 Author:Iwata, H., Harazono, Y., and Ueyama, M.
Climatic physical snowpack properties for large-scale modeling examined by observations and a physical model Polar Science,6:79-95 2012 Author:Saito, K., Yamaguchi, S., Iwata, H., Harazono, Y., Kosugi, K., Lehning, M., and Shulski, M.
Seasonal and interannual variation in net ecosystem production of an evergreen needleleaf forest Journal of Forest Research,17:283-295 2012 Author:Mizoguchi, Y., Ohtani, Y., Takanashi, S., Iwata, H., Yasuda, Y., and Nakai, Y.
The role of permafrost in water exchange of a black spruce forest in Interior Alaska Agricultural and Forest Meteorology,161:107-115 2012 Author:Iwata, H., Harazono, Y., and Ueyama, M.
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 Author:Marthews, T., Malhi, Y., and Iwata, H.
Quick recovery of carbon dioxide exchanges in a burned black spruce forest in Interior Alaska SOLA,7:105-108 2011 Author:Iwata, H., Ueyama, M., Harazono, Y., Tsuyuzaki, S., Kondo, M., and Uchida, M.
Importance of mixing ratio for a long-term CO2 flux measurement with a closed-path system Tellus,63B:302-308 2011 Author:Nakai, T., Iwata, H., and Harazono, Y.
Climatic characteristics of the Fujiyoshida forest meteorology research site Mount Fuji Research,5:1-6 2011 Author:Mizoguchi, Y., Ohtani, Y., Nakai, Y., Iwata, H., Takanashi, S., Yasuda, Y., Nakano, T., Yasuda, T., Watanabe, T.
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 Author:Iwata, H., Harazono, Y. and Ueyama, M.
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 Author:Iwata, H., Asanuma, J., Ohtani, Y., Mizoguchi, Y. and Yasuda, Y.
Gap-filling measurements of carbon dioxide storage in tropical rainforest canopy airspace Agricultural and Forest Meteorology,132:305-314 2005 Author:Iwata, H., Malhi, Y. and von Randow, C.
学会発表 Peatland-dominated boreal ecoregions at risk of drying in a warmer climate AGU Fall Meeting 2019 2019(Dec.) Author:Helbig, M., Waddington, J. M., Alekseychik, P., Amiro, B. D., Aurela, M., Barr, A., Black, T. A., Blanken, P., Carey, S. K., Chen, J., Chi, J., Desai, A. R., Dunn, A. L., Euskirchen, E. S., Friborg, T., Flanagan, L. B., Forbrich, I., Grelle, A., Harder, S. R., Heliasz, M., Humphreys, E., Ikawa, H., Iwata, H., Isabelle, P.-E., Jassal, R., Kurbatova, J., Korkiakoski, M., Kutzbach, L., Lindroth, A., Ohta, T., Lofvenius, M. O., Lohila, A., Maximov, T. C., Mammarella, I., Marsh, P., Melton, J., Moore, P., Nadeau, D., Nicholls, E., Nilsson, M. B., Peichl, M., Petrone, R. M., Petrov, R. E., Quinton, W. L., Roulet, N. T., Reed, D. E., Runkle, B., Rutgersson, A., Sahlee, E., Sonnentag, O., Strachan, I. B., Taillardat, P., Tuittila, E.-S., Tuovinen, J.-P., Turner, J., Ueyama, M., Varlagin, A., Wilmking, M. and Wofsy, S. C.
Driving Factors of Changes in Evapotranspiration from a Red Pine Ecosystem AsiaFlux Workshop 2019 2019(Oct.) Author:Suzuki, T. Iwata, H., Takanashi, S., Miyama, T., Mizoguchi, Y., Okano, M., Kominami, Y., Yoshifuji, N., and Nakano, T.
The controlling factors of diffusive and ebullitive methane emission on sub-daily time scale at a mid-latitude shallow lake AsiaFlux Workshop 2019 2019(Oct.) Author:Taoka, T., Iwata, H., Miyabara, Y., Hirata, R., Takahashi, Y.
Simulation of methane dynamics in a mid-latitude eutrophic lake with constraints using incubation data AsiaFlux Workshop 2019 2019(Oct.) Author:Iwata, H., Nakano, S., Stepanenko, V., Kobayashi, D., Taoka, T., Itoh, M., Miyabara, Y., Hirata, R., and Takahashi, Y.
Estimation of greenhouse gas budget over high-latitude ecosystems using a process-based ecosystem model, VISIT AsiaFlux Workshop 2019 2019(Oct.) Author:Okamura, M., Ueyama, M., Ito, A., Ichii, K., Iwata, H., Euskirchen, E. S., Goeckede, M., Sonnentag, O., Flanagan, L. B., Harazono, Y., Helbig, M., Hirano, T., Oechel, W. C., and Zona, D.
Estimating northern ecosystems methane flux based on a satellite data driven model, TCF AsiaFlux Workshop 2019 2019(Oct.) Author:Luo, J., Ueyama, M., Okamura, M., Watts, J. D., Iwata, H., Euskirchen, E. S., Goeckede, M., Sonnentag, O., Flanagan, L. B., Harazono, Y., Helbig, M., Hirano, T., Oechel, W. C., and Zona, D.
Long term variation of CO2 flux at cool temperate red pine forest in Japan AsiaFlux Workshop 2019 2019(Oct.) Author:Kominami, Y., Miyama, T., Yoshifuji, N., Okano, M., Yasuda, Y., Yamanoi, K., Mizoguchi, Y., Takanashi, S., Kitamura, K., Nakano, T., Yasuda, T., Wada, R., Iwata, H., Watanabe, T., Nakai, Y., Ohtani, Y.
Estimating CH4 fluxes across high latitude ecosystems using VISIT model iLEAPS/IGAC-Japan meeting 2019 2019(Sep.) Author:Okamura, M., Ueyama, M., Ito, A., Ichii, K., Iwata, H., Euskirchen, E. S., Goeckede, M., Sonnentag, O., Flanagan, L. B., Harazono, Y., Helbig, M., Hirano, T., Oechel, W. C., Zona, D.
Current status of CO2 balance in the Arctic black spruce forest based on the long-term observation and the future progress Korean Society of Agricultural and Forest Meteorology 20th Anniversary Symposium 2019(Aug. 30) Author:Harazono, Y., Ueyama, M., Iwata, H., and Hiyama, T.
Search for microbial CH4 production processes in lake sediments and surface water associated with cyanobacterial bloom JpGU-AGU joint meeting 2019 2019(May) Author:Matsushita, M., Takano, Y., Imachi, H., Urai, A., Park, H.-D., Iwata, H., Ohkouchi, N.
高緯度生態系に対する生態系モデルVISITのパラメータリゼーション 日本農業気象学会2019年全国大会 2019(Mar.) Author:岡村幹太， 植山雅仁，伊藤昭彦，岩田拓記，Goeckede, M., Sonnentag, O., Helbig, M., 原薗芳信，平野高司，Euskirchen, E., Flanagan, L. B., Oechel, W. C., Zona, D.
The influence of vegetation on shallow soil and air temperature coupling: a Pan-Arctic data synthesis 2018 AGU Fall meeting 2018(Dec.) Author:Kropp, H., Loranty, M. M., Natali, S., Kholodov, A. L., Abbott, B., Abermann, J., Blanc-Betes, E., Blok, D., Blume-Werry, G., Boike, J., Breen, A. L., Cahoon, S. M. P., Christiansen, C., Douglas, T. A., Elberling, B., Epstein, H. E., Euskirchen, E. S., Frost, G., Goeckede, M., Gough, L., Heijmans, M., Hjort, J., Hoye, T. T., Humphreys, E., Iversen, C. M., Iwata, H., Jones, B. M., Jorgenson, T., Juszak, I., Kim, Y., Lafleur, P., Laundre, J., Lund, M., Mamet, S., Mauritz, M., Michelsen, A., Myers-Smith, I. H., O'Donnell, J., Olefeldt, D., Phoenix, G. K., Rocha, A. V., Romanovsky, V. E., Salmon, V. G., Sannel, B., Schaepman-Strub, G., Smith, S. L., Sonnentag, O., Tape, K. D., Torn, M. S., Vaughn, L. S., Williams, M., Wilson, C. J.
Modeling greenhouse gas budget in the northern ecosystems using a process-based ecosystem model, VIST 2018 AGU Fall meeting 2018(Dec.) Author:Okamura, M., Ueyama, M., Ito, A., Iwata, H., Euskirchen, E., Goeckede, M., Sachs, T., Sonnentag, O., Emmerton, C., Flanagan, L., Harazono, Y., Helbig, M., Hirano, T., St. Louis, V., Nadeau, D., Oechel, W., Zona, D.
Constraining methane dynamics modules in ecosystem models using eddy flux measurements at northern ecosystems 2018 AGU Fall meeting 2018(Dec.) Author:Ueyama, M., Okamura, M., Ito, A., Iwata, H., Euskirchen, E., Goeckede, M., Sonnentag, O., Emmerton, C., Flanagan, L., Harazono, Y., Helbig, M., Hirano, T., Louis, V. St., Nadeau, D., Oechel, W., Zona, D.
Response of thermal regime of a shallow mid-latitude lake to climate change 2018 AGU Fall meeting 2018(Dec.) Author:Kobayashi, D., Iwata, H., Stepanenko, V., and Miyabara, Y.
Eddy covariance and biogeochemical observations of methane dynamics in a shallow mid-latitude lake in Japan OzFlux-AsiaFlux Joint Conference 2018(Aug. 23) Author:Iwata, H., Hirata, R., Takahashi, Y., Itoh, M., Miyabara, Y., and Kobayashi, D.
Driving factors of the change in evapotranspiration from a red pine ecosystem OzFlux-AsiaFlux Joint Conference 2018(Aug. 23) Author:Suzuki, T., Iwata, H., Takanashi, S., Miyama, T., Mizoguchi, Y., Okano, M., Kominami, Y., and Yoshifuji, N.
Long-term monitoring carbon balance at a black spruce forest in interior Alaska Fifth International Symposium on Arctic Research 2018(Jan. 16) Author:Ueyama, M., Iwata, H., Nagano, H., and Harazono, Y.
Methane production potential and microbial community structure for different forest soils AGU Fall Meeting 2017 2017(Dec.) Author:Matsumoto, Y., Ueyama, M., Kominami, Y., Endo, R., Tokumoto, H., Hirano, T., Takagi, K., Takahashi, Y., Iwata, H., and Harazono, Y.
Evaluation of methane emission from a mid-latitude lake with the eddy covariance technique Physical Processes in Natural Waters 2017(Aug. 22) Author:Iwata, H., Hirata, R., Takahashi, Y., Itoh, M., Iizuka, K., Miyabara, Y., Kobayashi, D., and Tokida, T.
Simulation of heat exchange and water temperature profile in a shallow mid-latitude lake AsiaFlux Workshop 2017 2017(Aug. 17) Author:Kobayashi, D., Iwata, H., Miyabara, Y., and Stepanenko, V.
Evaluation of methane emission from a mid-latitude lake with the eddy covariance technique AsiaFlux Workshop 2017 2017(Aug. 17) Author:Iwata, H., Hirata, R., Takahashi, Y., Itoh, M., Iizuka, K., Miyabara, Y., Nakazawa, K., Satoh, H., Kobayashi, D., and Tokida, T.
Response of methane emission from a poorly-drained black spruce forest over permafrost in an interior Alaska The 2nd Asian Conference on Permafrost 2017(Jul.) Author:Igarashi, Y., Iwata, H., Ueyama, M., Hiyama, T., Futakuchi, Y., Matsumoto, Y., and Harazono, Y.
Response of methane emission from a poorly-drained black spruce forest over permafrost in an Interior Alaska The Seventh Symposium on Polar Science 2016(Dec.) Author:Igarashi, Y., Iwata, H., Ueyama, M., Hiyama, T., Futakuchi, Y., Matsumoto, Y., and Harazono, Y.
Carbon and water exchange studies of black spruce forests in Interior Alaska International Russian-Japanese conference of young polar scientists 2016(Oct. 11) Author:Iwata, H.
Regional CO2 uptake estimation applying the light use efficiency model with MODIS and field data to examine wildfire effects in Alaskan boreal forest Arctic Science Summit Week 2015 2015(Apr.) Author:Otsuki, M., Iwata, H., Iwata, T., Nagano, H., Harazono, Y., Iwama, C., and Ueyma, M.
Methane exchange in a poorly-drained black spruce forest over permafrost observed with the eddy covariance technique Arctic Science Summit Week 2015 2015(Apr.) Author:Iwata, H., Harazono, Y., Ueyama, M., Sakabe, A., Nagano, H., Kosugi, Y., Takahashi, K., and Kim, Y.
Methane exchange in a poorly-drained black spruce forest over permafrost observed with the eddy covariance technique Arctic Change 2014 2014(Dec.) Author:Iwata, H., Harazono, Y., Ueyama, M., Sakabe, A., Nagano, H., Kosugi, Y., Takahashi, K., Kim, Y.
AsiaFlux Workshop 2015 -Challenges and Significance of Ecosystem Research in Asia to Better Understand Climate Change- 参加報告 生物と気象 , 16:D1-5 2016(Feb.) Author:岩田拓記，沖元洋介，佐伯田鶴，和田龍一，平田竜一
A year-round flux observation at an area burned by wildfire in Interior Alaska AsiaFlux Newsletter , 32:13-18 2011 Author:Iwata, H., Ueyama, M., and Harazono, Y.
Comparison of the characteristics of five quantum sensors Bulletin of FFPRI , 9:113-120 2010 Author:Mizoguchi, Y., Ohtani, Y., Aoshima, T., Hirakata, A., Yuta, S., Takanashi, S., Iwata, H., and Nakai, Y.
Development of portable CO2 flux observation system using a closed-path gas analyzer for intercomparison Bulletin of FFPRI , 9:31-36 2010 Author:Ohtani, Y., Mizoguchi, Y., Takanashi, S., Yasuda, Y., Iwata, H., Nakai, Y., Yuta, S., and Yamanoi, K.
Continuous methane flux observation, and validation of carbon, water and energy exchanges during forest recovery from fire in black spruce forests in Alaska IJIS Newsletter , 9:2-3 2009 Author:Iwata, H.
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