*Japanese articles are not listed on this page. 

Peer-Reviewed Papers

• Isaji, Y., Sugie, K., Ishikawa, N.F., Ogawa, N.O., Matsumoto, K., Yoshikawa, C., Obata, H., Honda, M.C., and Ohkouchi, N. (2025) Distributions of heme B and its implications on Fe biogeochemistry in the eastern Indian Ocean and the western North Pacific Ocean. Progress in Earth and Planetary Science, 12: 14. doi:10.1186/s40645-025-00689-4. [Open Access]
• Higuchi, T., Chung, M.-T., Yoshikawa, C., and Minegishi, Y. (2024) Editorial: Sharing technical knowledge to understand the distribution patterns and migration history of marine organisms. Frontiers in Marine Science, 11:1392102. doi:10.3389/fmars.2024.1392102. [Open Access]
• Yoshikawa, C., Shigemitsu, M., Yamamoto, A., Oka, A., and Ohkouchi, N. (2024) A nitrogen isoscape of phytoplankton in the western North Pacific created with a marine nitrogen isotope model. Frontiers in Marine Science, 11: 1294608. doi: 10.3389/fmars.2024.1294608 [Open Access]
• Toyoda, S., Terajima, K., Yoshida, N., Yoshikawa, C., Makabe, A., Hashihama, F., Ogawa, H. (2023) Extensive Accumulation of Nitrous Oxide in the Oxygen Minimum Zone in the Bay of Bengal. Global Biogeochemical Cycles, 37(9), e2022GB007689. doi:10.1029/2022GB007689. [Abstract]
• Harada, Y., Ito, S., Ogawa, N.O., Yoshikawa, C., Ishikawa, N.F., Yoneda, M., and Ohkouchi, N. (2022) Compound-Specific Nitrogen Isotope Analysis of Amino Acids in Eye Lenses as a New Tool to Reconstruct the Geographic and Trophic Histories of Fish. Frontiers in Marine Science, 8:796532. doi:10.3389/fmars.2021.796532. [Open Access]
• Isaji, Y., Yoshikawa, C., Ogawa, N.O., Matsumoto, K., Makabe, A., Toyoda, S., Ishikawa, N.F., Ogawa, H., Saito, H., Honda, M.C., and Ohkouchi, N. (2022) Nitrogen sources for phytoplankton in the eastern Indian Ocean determined from δ15N of chlorophyll a and divinylchlorophyll a. Geochemistry, Geophysics, Geosystems, 23(4), e2021GC010057. doi:10.1029/2021GC010057. [Open Access]
• Yoshikawa, C., Ogawa, N.O., Chikaraishi, Y., Makabe, A., Matsui, Y., Sasai, Y., Wakita, M., Honda, M.C., Mino, Y., Aita, M.N., Fujiki, T., Nunoura, T., Harada, N., and Ohkouchi, N. (2022) Nitrogen Isotopes of Sinking Particles Reveal the Seasonal Transition of the Nitrogen Source for Phytoplankton. Geophysical Research Letters, 49(17), e2022GL098670. doi:10.1029/2022GL098670. [Open Access]
• Fripiat, F., Marconi, D., Rafter, P.A., Sigman, D.M., Altabet, M.A., Bourbonnais, A., Brandes, J., Casciotti, K.L., Deman, F., Dehairs, F., Emeis, K.-C., Fawcett, S., Galbraith, E.D., Gaye, B., Granger, J., Harms, N., Haug, G.H., Kemeny, P.C., Kienast, M., Knapp, A., Kopf, S., Lehmann, M.F., Luu, V.H., Martin, T., Martínez-García, A., Pantoja, S., Peng, X., Peters, B., Smart, S., Trull, T.W., Van Oostende, N., Voss, M., Yoshikawa, C., Zhang, R., and Dähnke, K. (2021) Compilation of nitrate δ15N in the ocean. PANGAEA, doi:10.1594/PANGAEA.936484. [Abstract]
• Matsubayashi, J., Osada, Y., Tadokoro, K., Abe, Y., Yamaguchi, A., Shirai, K., Honda, K., Yoshikawa, C., Ogawa, N.O., Ohkouchi, N., Ishikawa, N.F., Nagata, T., Miyamoto, H., Nishino, S., and Tayasu, I. (2020) Tracking long‐distance migration of marine fishes using compound‐specific stable isotope analysis of amino acids. Ecology Letters, 23(5), 881-890. doi:10.1111/ele.13496. [Abstract]
• Mino, Y., Sukigara, C., Honda, M.C., Kawakami, H., Wakita, M., Sasaoka, K., Yoshikawa, C., Abe, O., Kaiser, J., Kimoto, K., Kitamura, M., Fujiki, T., Matsumoto, K., and Saino, T. (2020) Seasonal and Interannual Variations in Nitrogen Availability and Particle Export in the Northwestern North Pacific Subtropical Gyre. Journal of Geophysical Research: Oceans, 125(5), e2019JC015600. doi:10.1029/2019JC015600. [Abstract]
• Breider, F., Yoshikawa, C., Makabe, A., Toyoda, S., Wakita, M., Matsui, Y., Kawagucci, S., Fujiki, T., Harada, N., and Yoshida, N. (2019) Response of N₂O production rate to ocean acidification in the western North Pacific. Nature Climate Change, 9, 954-958. doi:10.1038/s41558-019-0605-7. [Abstract]
• Danielache, S.O., Yoshikawa, C., Kajino, M., Itou, S., Kakeya, W., Yoshida, N., and Igarashi, Y. (2019) Radioactive ³⁵S emitted from the Fukushima Nuclear Power Plant and its re-suspension from the contaminated area. Geochemical Journal, 53(2), 103-118. doi:10.2343/geochemj.2.0542. [Abstract]
• Shiozaki, T., Ijichi, M., Fujiwara, A., Makabe, A., Nishino, S., Yoshikawa, C., and Harada, N. (2019) Factors Regulating Nitrification in the Arctic Ocean: Potential Impact of Sea Ice Reduction and Ocean Acidification. Global Biogeochemical Cycle, 33(8), 1085-1099. doi:10.1029/2018GB006068. [Open Access]
• Kawagucchi, S., Makabe, A., Kodama, T., Matsui, Y., Yoshikawa, C., Ono, E., Wakita, M., Nunoura, T., Uchida, H., and Yokokawa, T. (2018) Hadal water biogeochemistry over the Izu-Ogasawara Trench observed with a full-depth CTD-CMS. Ocean Science, 14(4), 575-588. doi:10.5194/os-2018-37. [Open Access]
• Yasunaka, S., Nojiri, Y., Hashioka, T., Yoshikawa, C., Kodama, T., Nakaoka, S., Chiba, S., Hashihama, F., Wakita, M., Furuya, K., Sasano, D., Murata, A., Uchida, H., and Aoyama, M. (2018) Basin-scale distribution of NH₄⁺ and NO₂⁻ in the Pacific Ocean. Journal of Oceanography, 74(1), 1-11. doi:10.1007/s10872-017-0433-1. [Abstract]
• Yoshikawa, C., Makabe, A., Matsui, Y., Nunoura, T., and Ohkouchi, N. (2018) Nitrate isotope distribution in the subarctic and subtropical North Pacific. Geochemistry, Geophysics, Geosystems, 19(7), 2212-2224. doi:10.1029/2018GC007528. [Open Access]
• Honda, M.C., Wakita, M., Matsumoto, K., Fujiki, T., Siswanto, E., Sasaoka, K., Kawakami, H., Mino, Y., Sukigara, C., Kitamura, M., Sasai, Y., Smith, S.L., Hashioka, T., Yoshikawa, C., Kimoto, K., Watanabe, S., Kobari, T., Nagata, T., Hamasaki, K., Kaneko, R., Uchimiya, M., Fukuda, H., Abe, O., and Saino, T. (2017) Comparison of carbon cycle between the western Pacific subarctic and subtropical time-series stations: highlights of the K2S1 project. Journal of Oceanography, 73(5), 647-667. doi:10.1007/s10872-017-0423-3. [Abstract]
• Kajino, M., Ishizuka, M., Igarashi, Y., Kita, K., Yoshikawa, C., and Inatsu, M. (2016) Long-term assessment of airborne radiocesium after the Fukushima nuclear accident: re-suspension from bare soil and forest ecosystems. Atmospheric Chemistry and Physics, 16(20), 13149-13172. doi:10.5194/acp-16-13149-2016. [Open Access]
• Sasai, Y., Yoshikawa, C., Smith, S.L., Hashioka, T., Matsumoto, K., Wakita, M., Sasaoka, K., and Honda, M.C. (2016) Coupled 1-D physical-biological model study of phytoplankton production at two contrasting time-series stations in the western North Pacific. Journal of Oceanography, 72(3), 509-526. doi:10.1007/s10872-015-0341-1. [Abstract]
• Yoshikawa, C., Abe, H., Aita, M.N., Breider, F., Kuzunuki, K., Toyoda, S., Ogawa, N.O., Suga, H., Ohkouchi, N., Danielache, S.O., Wakita, M., Honda, M.C., and Yoshida, N. (2016) Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model. Journal of Oceanography, 72(3), 491-508. doi:10.1007/s10872-015-0308-2. [Abstract]
• Breider, F., Yoshikawa, C., Abe, H., Toyoda, S., and Yoshida, N. (2015) Origin and fluxes of nitrous oxide along a latitudinal transect in western North Pacific: Controls and regional significance. Global Biogeochemical Cycles, 29(7), 1014-1027. doi:10.1002/2014GB004977. [Open Access]
• Smith S.L., Pahlow, M., Merico, A., Acevedo-Trejos, E., Sasai, Y., Yoshikawa, C., Sasaoka, K., Fujiki, T., Matsumoto, K., and Honda, M.C. (2015) Flexible phytoplankton functional type (FlexPFT) model: size-scaling of traits and optimal growth. Journal of Plankton Research, 38(4), 977-992. doi:10.1093/plankt/fbv038. [Open Access]
• Yoshikawa, C., Makabe, A., Shiozaki, T., Toyoda, S., Yoshida, O., Furuya, K., and Yoshida, N. (2015) Nitrogen isotope ratios of nitrate and N* anomalies in the subtropical South Pacific. Geochemistry, Geophysics, Geosystems, 16(5), 1439-1448. doi:10.1002/2014GC005678. [Open Access]
• Yoshikawa, C., Hayashi, E., Yamada, K., Yoshida,O., Toyoda, S., and Yoshida, N. (2014) Methane sources and sinks in the subtropical South Pacific along 17°S as traced by stable isotope ratios. Chemical Geology, 382, 24-31. doi:10.1016/j.chemgeo.2014.05.024. [Open Access]
• Yoshikawa, C., Coles, V.J., Hood, R.R., Capone, D.G., and Yoshida, N. (2013) Modeling how surface nitrogen fixation influences subsurface nutrient patterns in the North Atlantic. Journal of Geophysical Research - Oceans, 118, 2520-2534. doi:10.1002/jgrc.20165. [Open Access]
• Danielache, S.O., Yoshikawa, C., Priyadarshi, A., Takemura, T., Ueno, Y., Thiemens, M.H., and Yoshida, N. (2012) An estimation of the radioactive ³⁵S emitted into the atmospheric from the Fukushima Daiichi Nuclear Power Plant by using a numerical simulation global transport. Geochemical Journal, 46(4), 335-339. doi:10.2343/geochemj.2.0212. [Open Access]
• Yoshikawa, C., Kawamiya, M., Kato, T., Yamanaka Y., and Matsuno, T. (2008) Geographical distribution of the feedback between future climate change and the carbon cycle. Journal of Geophysical Research - Biogeosciences, 113, G03002. doi:10.1029/2007JG000570. [Open Access]
• Yoshikawa, C., Nakatsuka, T., and Wakatsuchi, M. (2006) Distribution of N* in the Sea of Okhotsk and its use as a biogeochemical tracer of the Okhotsk Sea Intermediate Water formation process. Journal of Marine Systems, 63, 49-62. doi:10.1016/j.jmarsys.2006.05.008. [Abstract]
• Yoshikawa, C., Yamanaka Y., and Nakatsuka, T. (2006) Nitrate-nitrogen isotopic patterns in surface waters of the western and central equatorial pacific. Journal of Oceanography, 62, 511-525. doi:10.1007/s10872-006-0072-4. [Abstract]
• Friedlingstein, P., Cox , P., Betts, R., Bopp, L., von Bloh, W., Brovkin, V., Cadule, P., Doney, S., Eby, M., Fung, I., Bala, G., John, J., Jones, C., Joos, F., Kato, T., Kawamiya, M., Knorr, W., Lindsay, K., Matthews, H.D., Raddatz, T., Rayner, P., Reick, C., Roeckner, E., Schnitzler, K.-G., Schnur, R., Strassmann, K., Weaver, A.J., Yoshikawa, C., and Zeng, N. (2006) Climate --carbon cycle feedback analysis, results from the C⁴MIP model intercomparison. Journal of Climate, 19, 3337-3353. [Open Access]
• Seki, O., Yoshikawa, C., Nakatsuka, T., Kawamura, K., and Wakatsuchi, M. (2006) Fluxes, source and transport of organic matter in the western Sea of Okhotsk: Stable carbon isotopic ratios of n-alkanes and total organic carbon. Deep-Sea Research Part I, 53, 253-270. doi:10.1016/j.dsr.2005.11.004. [Abstract]
• Kawamiya, M., Yoshikawa, C., Kato, T., Sato, H., Sudo, K., Watanabe S., and Matsuno, T. (2005) Development of an Integrated Earth System Model on the Earth Simulator. Journal of Earth Simulator, 4, 18-30. [PDF]
• Yoshikawa, C., Nakatsuka, T., and Kawahata, H. (2005) Transition of low-salinity water in the Western Pacific Warm Pool recorded in the nitrogen isotopic ratios of settling particles. Geophysical Research Letters, 32. doi:10.1029/2005GL023103. [Open Access]
• Yoshikawa, C., Yamanaka, Y., and Nakatsuka, T. (2005) An ecosystem model including nitrogen isotopes: Perspectives on a study of the marine nitrogen cycle. Journal of Oceanography, 61, 921-942. doi:10.1007/s10872-006-0010-5. [Abstract]
• Nakatsuka T., Fujimune, T., Yoshikawa, C., Noriki, S., Kawamura, K., Fukamachi, Y., Mizuta, G., and Wakatsuchi, M. (2004) Biogenic and lithogenic particle fluxes in the western region of the Sea of Okhotsk: Implications for lateral material transport and biological productivity. Journal of Geophysical Research, 109, C09S13. doi:10.1029/2003JC001908. [Open Access]
• Nakatsuka T., Yoshikawa, C., Toda, M., Kawamura, K., and Wakatsuchi, M. (2002) An extremely turbid intermediate water in the Sea of Okhotsk: Implication for the transport of particulate organic matter in a seasonally ice-bound sea. Geophysical Research Letters, 29(16). doi:10.1029/2001GL014029. [Open Access]