Hajime Kawakami
Research Data Publish Technology Group
Center for Earth Information Science and Technology
Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
Address: 3173-25 Showa-machi Kanazawa-ku Yokohama 236-0001, Japan
E-mail:
Main Subject of Research
Management and release of observational and visual data.
Past Subjects of Research
Spread of current marine and earth sciences to the general public.
Strength of biological pump estimated from 234Th
in the northwestern North Pacific.
Comparison of biological pump estimated from 210Po
in the mesopelagic layer between the subarctic and subtropical
Educations
Faculty of Fisheries, Hokkaido University, B.S., 1993
Graduate School of Fisheries, Hokkaido University, M.S., 1996
Graduate School of Environmental Science, Hokkaido University, Ph.D., 2009
Professional Experiences
Department of Ocean Research, JAMSTEC, 1997-2001
Frontier Research Promotion Department, 2001-2002
Mutsu Institute for Oceanography, JAMSTEC, 2002-2014
Public Relations Division, JAMSTEC, 2014-2017
Center for Earth Information Science and Technology, JAMSTEC, 2017-
Movies
Datasets
234Th and POC data in the North Pacific.
Data of 210Po, 210Pb, POC, and PON at stations K2 and S1.
Radiocesium in the sinking and suspended particles in the western North Pacific.
230Th and 231Pa in the sinking particles in the subarctic western North Pacific.
228Ra and 226Ra radioactivities of the surface water in the northwestern North Pacific.
210Po and 210Pb in the northwesterm North Pacific in 1998.
Publications (reviewed articles)
40. Kawakami, H.:
Decadal decreasing trend in biological carbon pump estimated from 234Th in the western subarctic North Pacific.
Journal of Radioanalytical and Nuclear Chemistry 333, 1793-1802 (2024).
39. Nagashima, K., Kawakami, H.,
Sugie, K., Fujiki, T., Nishioka, J., Iwamoto, Y., Takemura, T., Miyakawa, T., Taketani, F., Noguchi Aita, M.:
Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles.
Scientific Reports 13, 15424 (2023).
38. Mino, Y., Sukigara, C., Kawakami, H.,
Wakita, M., Honda, M.C.:
Mesopelagic particulate nitrogen dynamics in the subarctic and subtropical regions of the western North Pacific.
Frontiers in Earth Science 11, 1176889 (2023).
37. Mino, Y., Sukigara, C., Honda, M., Kawakami, H.,
Wakita, M., Sasaoka, K., Yoshikawa, C., Abe, O., Kaiser, J., Kimoto, K., Kitamura, M., Fujiki, T., Matsumoto, K., Saino, T.:
Seasonal and interannual variations in nitrogen availability and
particle export in the northwestern North Pacific subtropical gyre.
Journal of Geophysical Research: Oceans 125, e2019JC015600 (2020).
36. Sukigara, C., Mino, Y., Kawakami, H.,
Honda, M., Fujiki, T., Matsumoto, K., Wakita, M.: Sinking dynamics of
particulate matter in the subarctic and subtropical regions of the
western North Pacific. Deep-Sea Research I 144, 17-27 (2019).
35. Uchimiya, M., Fukuda, H., Wakita, M., Kitamura, M., Kawakami, H.,
Honda, M.C., Ogawa, H., Nagata, T.: Balancing organic carbon supply and
consumption in the ocean’s interior: evidence from repeated
biogeochemical observations conducted in the subarctic and subtropical
western North Pacific. Limnology and Oceanography 63, 2015-2027
(2018).
34. Kitamura,
M., Honda, M.C., Hamajima, Y., Kumamoto, Y., Aoyama, M., Kawakami, H.,
Aono, T., Fukuda, M.,Mino, Y.: Temporal changes in radiocesium
contamination derived from the Fukushima Dai-ichi Nuclear Power Plant
accident in oceanic zooplankton in the western North Pacific. Journal
of Environmental Radioactivity 172, 163-172 (2017).
33. Honda, M.C., Matsumoto, K., Fujiki, T., Siswato, E., Sasaoka, K., Sasaoka, K., Kawakami, H.,
Wakita, M., 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., Saino, T.: Comparison of carbon cycle between the western Pacific
subarctic and subtropical time-series stations: highlights of the K2S1
project. Journal of
Oceanography 73, 647-667 (2017).
32. Mino, Y., Sukigara, C., Honda, M.C., Kawakami, H., Matsumoto, K., Wakita, M., Kitamura, M., Fujiki, T., Sasaoka, K., Abe, O., Kaise, J., Saino, T.: Seasonal variations in the nitrogen isotopic composition of settling particles at station K2 in the western subarctic North Pacific. Journal of Oceanography 72, 819-836 (2016).
31. Wakita, M., Honda, M.C., Matsumoto, K., Fujiki, T., Kawakami, H., Yasunaka, S., Sasai, Y., Sukigara, C., Uchimiya, M., Kitamura, M., Kobari, T., Mino, Y., Nagano, A., Watanabe, S., Saino, T.: Biological organic carbon export estimated from the annual carbon budget observed in the surface waters of the western subarctic and subtropical North Pacific Ocean from 2004 to 2013. Journal of Oceanography 72, 665-685 (2016).
30. Kobari, T., Nakamura, R., Unno, K., Kitamura, M., Nagafuku, H., Niibo, A., Kawakami, H., Matsumoto, K., Honda, M.C.: Seasonal variability in carbon demand and flux by mesozooplankton communities at subarctic and subtropical sites in the western North Pacific Ocean. Journal of Oceanography 72, 403-418 (2016).
29. Honda, M.C., Kawakami, H., Matsumoto, K., Fujiki, T., Mino, Y., Sukigara, C., Kobari, T., Uchimiya, M., Kaneko, R., Saino, T.: Comparison of sinking particles in the upper 200 m between subarctic station K2 and subtropical station S1 based on drifting sediment trap experiments. Journal of Oceanography 72, 373-38 (2016).
28. Buesseler, K.O., German, C.R., Honda, M.C., Otosaka, S, Black, E.E., Kawakami, H., Manganini, S.J., Pike, S.M.: Tracking the Fate of Particle Associated Fukushima Daiichi Cesium in the Ocean off Japan. Environmental Science & Technology 49, 9807-9816 (2015).
27. Kawakami, H., Honda, M.C., Matsumoto, K., Wakita, M., Kitamura, M., Fujiki, T., Watanabe, S.: POC fluxes estimated from 234Th in late spring-early summer in the western subarctic North Pacific. Journal of Oceanography 71, 311-324 (2015).
26. Matsumoto, K., Honda, M.C., Sasaoka, K., Wakita, M., Kawakami, H., Watanabe, S.: Seasonal variability of primary production and phytoplankton biomass in the western Pacific subarctic gyre: Control by light availability within the mixed layer. Journal of Geophysical Research: Oceans 119, 6523-6534 (2014).
25. Honda, M.C., Kawakami, H.: Sinking velocity of particulate radiocesium in the northwestern North Pacific. Geophysical Research Letters, 10.1002/2014GL060126 (2014).
24. Kawakami, H., Honda, M.C., Watanabe, S., Saino, T.: Time-series observations of 210Po and 210Pb radioactivity in the western North Pacific. Journal of Radioanalytical and Nuclear Chemistry 301, 461-468 (2014).
23. Fujiki, T., Matsumoto, K., Mino, Y., Sasaoka, K., Wakita, M., Kawakami, H., Honda, M.C., Watanabe, S., Saino, T.: Seasonal cycle of phytoplankton community structure and photophysiological state in the western subarctic gyre of the North Pacific. Limnology and Oceanography 59, 887-900 (2014).
22. Kitamura, M., Kumamoto, Y., Kawakami, H., Cruz, E.C., Fujikura, K.: Horizontal distribution of Fukushima-derived radiocesium in zooplankton in the northwestern Pacific Ocean. Biogeosciences 10, 5729-5738 (2013).
21. Kobari, T., Kitamura, M., Minowa, M., Isami, H., Akamatsu, H., Kawakami, H., Matsumoto, K., Wakita, M., Honda, M.C.: Impacts of the wintertune nesozooplankton community to downward carbon flux in the subarctic and subtropical Pacific Oceans. Deep-Sea Research I 81, 78-88 (2013).
20. Honda, M.C., Kawakami, H., Watanabe, S., Saino, T.: Concentration and vertical flux of Fukushima-derived radiocesium in sinking particles from two sites in the Northwestern Pacific Ocean. Biogeosciences 10, 3525-3534 (2013).
19. Wakita, M., Watanabe, S., Honda, M.C., Nagano, A., Kimoto, K., Matsumoto, K., Kawakami, H., Fujiki, T., Kitamura, M., Sasaki, K., Sasaoka, K., Nakono, Y., Murata, A.: Ocean acidification from 1997 to 2011 in the subarctic western North Pacific Ocean. Biogeosciences 10, 7817-7827 (2013).
18. Fukuda, M., Harada, N., Sato, M., Lange, C. B., Ahagon, N., Kawakami, H., Miyashita, W., Pantoja, S., Matsumoto, T., Motoyama, I.: 230Th-normalized fluxes of biogenic components from the central and southernmost Chilean margin over the past 22,000 years. Geochemical Journal 47, 119-135 (2013).
17. Harada, N., Kawakami, H., Fukuda, M., Miyashita, W., Matsumoto, T.: 230Th-normalized fluxes of biogenic components from the central Chilean margin during the late Quaternary. Journal of Geography 121, 555-569 (2012).
16. Matsumoto, K., Fujiki, T., Honda, M.C., Wakita, M.,Kawakami, H., Kitamura, M., Saino, T.: Inhibition of primary production by nitrile rubber O-rings in Niskin sampler. JAMSTEC Report of Research and Development 14, 17-25 (2012).
15. Honda, M.C., Aono, T., Aoyama, M., Hamajima, Y., Kawakami, H., Kitamura, M., Masumoto, Y., Miyazawa, Y., Takigawa, M., Saino, T.: Dispersion of artificial caesium-134 and -137 in the western North Pacific one month after the Fukushima accident. Geochemical Journal 46, e1-e9 (2012).
14. Shigemitsu, M., Watanabe, Y.W., Yamanaka, Y., Kawakami, H., Honda, M.C.: Relationship between sinking organic matter and minerals in the shallow zone of the western subarctic Pacific. Journal of Oceanography 66, 697-708 (2010).
13. Kawakami, H., Honda, M.C., Matsumoto, K., Fujiki, T., Watanabe, S.: East-west distribution of nutrients and dissolved inorganic carbon in the northern North Pacific in autumn. The Open Oceanography Journal 4, 99-106 (2010).
12. Kawakami, H., Honda, M.C., Matsumoto, K., Fujiki, T., Watanabe, S.: East-west distribution of POC fluxes estimated from 234Th in the northern North Pacific in autumn. Journal of Oceanography 66, 71-83 (2010).
11. Honda, M.C., Sasaoka, K., Kawakami, H., Matsumoto, K., Watanabe, S., Dickey T.D.: Application of underwater optical data to estimation of primary productivity. Deep-Sea Research I 56, 2281-2292 (2009).
10. Kawakami, H.: Scavenging of 210Po and 234Th by particulate organic carbon in the surface layer of the northwestern North Pacific Ocean. Far East Journal of Ocean Research 2, 67-82 (2009).
9. Kawakami, H., Yang Y.-L., Kusakabe, M.: Distributions of 210Po and 210Pb radioactivity in the intermediate layer of the northwestern North Pacific. Journal of Radioanalytical and Nuclear Chemistry 279, 561-566 (2009).
8. Fujiki, T., Matsumoto, K., Honda, M.C., Kawakami, H., Watanabe, S.: Phytoplankton composition in the subarctic North Pacific during autumn 2005. Journal of Plankton Research 31, 179-191 (2009).
7. Kawakami, H., Kusakabe, M.: Surface water mixing estimated from 228Ra and 226Ra in the northwestern North Pacific. Journal of Environmental Radioactivity 99, 1335-1340 (2008).
6. Kawakami, H., Honda, M.C., Wakita., M, Watanabe, S.: Time-series observation of dissolved inorganic carbon and nurtients in the northwestern North Pacific. Journal of Oceanography 63, 967-982 (2007).
5. Kawakami, H., Honda, M.C.: Time-series observation of POC fluxes estimated from 234Th in the northwestern North Pacific. Deep-Sea Research I 54, 1070-1090 (2007).
4. Honda, M.C., Kawakami, H., Sasaoka, K., Watanabe, S., Dickey, T.: Quick transport of primary produced organic carbon to the ocean interior. Geophysical Research Letters 33, 10.1029/2006GL026466 (2006).
3. Kawakami, H., Yang, Y-L., Honda, M. C., Kusakabe, M.: Particulate organic carbon fluxes estimated from 234Th deficiency in winters and springs in the northwestern North Pacific. Geochemical Journal 38, 581-592 (2004).
2. Murata, A., Kumamoto, Y., Saito, C., Kawakami, H., Asanuma, I., Kusakabe, M., Inoue, H.Y.: Impact of a spring phytoplankton bloom on the CO2 system in the mixed layer of the northwestern North Pacific. Deep-Sea Research II 49, 5531-5555 (2002).
1. Kuma, K., Katsumoto, A., Kawakami, H., Takatori, F., Matsunaga, K.: Spatial variability of Fe(III) hydroxide solubility in the water column of the northern North Pacific. Deep-Sea Research I 45, 91-113 (1998).
Others
PADI, Advanced Open Water Diver
Ski Association of Japan, First Class
