Research achievements [研究業績]

Hoshina, K., Narita, H., Harada, N., Jordan R.W. (2021) Diversity within the Triparma strigata-Triparma verrucosa group (Bolidophyceae), including five new taxa from polar-subpolar regions. Phycologia. https://doi.org/10.1080/00318884.2021.1888241.

Hoshina, K., Narita, H., Harada, N., Jordan R.W. (2021) Triparma laevis f. marchantii f. nov. (Bolidophyceae) from the Southern Ocean, and its comparison with other subspecific taxa of T. laevis, Phycologia. https://doi.org/10.1080/00318884.2021.1883365.

Shiozaki, T., Itoh, F., Hirose, Y., Onodera, J., Kuwata, A., Harada, N. (2021) A DNA metabarcoding approach for recovering plankton communities from archived samples fixed in formalin. PLOSONE, doi: 10.1371/journal.pone.0245936.

Gobarenko, S., Yanchenko, E, Psheneva, O., Harada, N., Bosin, A., Artemova, A. (2020) Orbital - millennial environment and hydrology changes of the central Okhotsk Sea over the last 136 kyr inferred by micropaleontrological (radiolarian and benthic foraminifera), geochemical and lithological proxies and mechanisms responsible for them. Quaternary Science Reviews 247, doi:10.1016/j.quascirev.2020.106569.

Shiozaki, T., Fujiwara, A., Inomura, K., Hirose, Y., Hashihama, F., Harada, N. (2020) Biological nitrogen fixation detected under Antarctic sea ice. Nature Geosciences, 13, 729-732 doi.org/10.1038/s41561-020-00651-7.

Mimura, K., Okumura, F., Harada, N. (2020) Constraints on the thermal history of the Allende (CV3) meteorite by gradual and stepwise pyrolyses of insoluble organic matter. Geochemical Journal, 54 (4), 255-265, doi:10.2343/geochemj.2.0589

Hirose, Y., Shiozaki, T., Otani, M., Kudoh, S., Imura, S., Eki, T., Harada N. (2020) Investigation algal mat communities in east Antarctica using deep amplicon sequencing of 16S and 18S rRNA genes. Microorganisms 8(4), 497; https://doi.org/10.3390/microorganisms8040497.

Tokuhiro, K., Abe, Y., Sampei, M., Fujiwara, A., Harada, N., Yamaguchi A. (2020) Regional comparison of seasonal changes on copepod community structure in the Arctic Ocean. Polar Science, doi:10.1016/j.polar.2020.100509.

Kajita, H., Nakamura, H., Ohkouchi N., Harada, N., Sato, M., Tokioka, S., Kawahata H. (2020) Genomic and geochemical identification of the long-chain alkenones producers in the estuarine Lake Takahoko, Japan: Implications for temperature reconstructions. Organic Geochemistry (accepted Jan 28, 2020) doi:10.1016/j.orggeochem.2020.103980.

Kajita, H., N. Harada, Y. Yokoyama, M. Sato, N. Ogawa, Y. Miyairi, C. Sawada, A. Suzuki, H. Kawahata (2020) High time-resolution alkenone paleotemperature variations of Tokyo Bay during the Meghalayan: implications for the cold climates and social unrests in Japan Quaternary Research Review 230, 418-428, doi: 10.1016/j.quascirev.2019.106160.

Sugie, K., Fujiwara, A., Nishino, S., Kameyama, S., Harada, N. (2020) Impacts of temperature, CO₂, and salinity on phytoplankton community composition in the western Arctic Ocean. Frontiers in Marine Science, section Global Change and the Future Ocean 6, doi:10.3389/fmars.2019.00821.

Nishino, S., Kawaguchi, Y., Inoue, J., Yamamoto-Kawai, M., Aoyama, M., Harada, N., Kikuchi, T. (2019) Do strong winds impact water mass, nutrient, and phytoplankton distributions in the ice-free Canada Basin in the fall? Journal of Geophysical Research, 125(1) doi:10.1029/2019JC015428.

Shiozaki, T., Hirose, Y., Hamasaki, K., Kaneko R., Ishikawa, K., Harada, N. (2019) Eukaryotic phytoplankton contributing to a seasonal bloom and carbon export revealed by tracking sequence variants in the western North Pacific, Frontiers in Microbiology, 10:2722, doi:10.3389/fmicb.2019.02722.

Breider F., Yoshikawa C., Makabe A., Toyoda S., Wakita M., Matsui Y., Kawagucci S., Fujiki T., Harada N., Yoshida N. (2019) Response of N2O production rate to ocean acidification in the western North Pacific. Nature Climate Change, 9, 954–958.

Kimura S., Onodera J., Itoh M., Kikuchi T., Nishino S., Kawaguchi Y., Watanabe E., Harada N. (2019) The warming of the Chukchi slope through the Barrow Canyon outflow in the 2016-2017 winter. Journal of Geophysical Research – Oceans, https://doi.org/10.1029/2019JC015093 (in press).

Ikenoue, T., Kimoto K., Okazaki Y., Sato M., Honda M.C., Takahashi K., Harada N., Fujiki T. (2019) Phaeodaria: an important carrier of particulate organic carbon in the mesopelagic twilight zone of the North Pacific Ocean. Global Biogeochemical Cycles, 33, 1146-1160 https://doi.org/10.1029/2019GB006258.

Shiozaki T., Ijichi M., Fujiwara A., Makabe A., Nishino S., Yoshikawa C., Harada N. (2019) Factors regulating nitrification in the Arctic Ocean: the potential impact of sea ice reduction and ocean acidification. Global Biogeochemical Cycles, 33, 1085-1099 https://doi.org/10.1029/2018GB006068.

Kawaguchi Y., Itoh M., Fukamachi Y., Moriya E., Onodera J., Kikuchi T., Harada N. (2019) Year-round observation of sea-ice drift and near-inertial internal waves in the Northwind Abyssal Plain, Arctic Ocean. Polar Science, https://doi.org/10.1016/j.polar.2019.01.004.

Ikenoue, T., K. R. Bjørklund, A. Fujiwara, M. Uchimiya, K. Kimoto, N. Harada, S. Nishino (2019) Horizontal and vertical distribution of polycystine radiolarians in the western Arctic Ocean during the summer of 2013 and 2015. Polar Biology, 42(2), 285-305.

Tokuhiro, K., Y. Abe, K. Matsuno, J. Onodera, A. Fujiwara, N. Harada, T. Hirawake, A. Yamaguchi (2019) Seasonal phenology of four dominant copepods in the Pacific sector of the Arctic Ocean: Insights from statistical analyses of sediment trap data, Polar Science, 19, 94-111 doi:10.1016/j.polar.2018.08.006.

Nishino, S., Y. Kawaguchi, A. Fujiwara, T. Shiozaki, M. Aoyama, N. Harada, T. Kikuchi (2018) Biogeochemical anatomy of a cyclonic warm-core eddy in the Arctic Ocean GRL 45(20), 11284-11292 .

Mori N., K. Sugitani, M. Yamamoto, R. Tomioka, M. Sato, N. Harada (2018) Major and minor elemental compositions of streamed biofilms and its implications of riverine biogeochemical cycles, Environmental Pollution, 243, 308-317.

Shiozaki, T., A. Fujiwara, M. Ijichi, N. Harada, S. Nishino, S. Nishi, T. Nagata, K. Hamasaki (2018) Diazotroph community structure and the role of nitrogen fixation in the nitrogen cycle in the Chukchi Sea (western Arctic Ocean) Limnology and Oceanography 63(5), 2191-2205.

Longo, W., Y. Huang, Y. Yao, J. Zhao, A. E Giblin, X. Wang, R. Zech, T. Haberzetti, L. Jardillier, J. Toney, Z. Liu, S. Krivonogov, G. Chu, W. J D'Andrea, N. Harada, K. Nagashima, M. Sato, H. Yonenobu, K. Yamada, K. Gotanda, Y. Shinozuka (2018) Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions Earth and Planetary Science Letters, doi:10.1016/j.epsl2018.04.002

Jimenez-Espejo, F. J., A. García-Alix, N. Harada, A. Bahr, S. Sakai, K. Iijima, Q. Chang, K. Sato, K. Suzuki (2018) Changes in detrital input, ventilation and productivity in the central Okhotsk Sea during the marine isotope stage 5e, penultimate interglacial period. Journal of Asian Earth Science 156, 189-200.

Loic, P., S. Bertrand, E.Vandekerkhove, N. Harada, C. Moffat, A. Rivera (2017) Gridded bathymetry to the Baker-Martinez fjord complex (Chile, 48S) v1. Figshare. https://doi.org/10.6084/m9.figshare.5285521.v3.

Kobayashi, D., M. Yamamoto, T. Irino, S.-I. Nam, Y.-H. Park, N. Harada, K. Nagashima, K. Chikita, and S.-I. Saitoh (2016) Distribution of detrital minerals and sediment color in western Arctic Ocean and northern Bering Sea sediments: Changes in the provenance of western Arctic Ocean sediments since the last glacial. Polar Science 10 (4), 519-531.

Saruwatari, K., M. Satoh, N. Harada, I. Suzuki, Y. Shiraiwa (2016) Change in coccolith morphology by responding to temperature and salinity in coccolithophore Emiliania huxleyi (Haptophyta) isolated from the Bering and Chukchi Seas. Biogeosciences, 13, 2743-2755, doi:10.5194/bg-13-2743-2016.

Ikenoue, T., P. Dumitrica, K. R. Bjørklund, A. Krabberød, K. Kimoto, K. Matsuno, N. Harada (2016) Living Entactinaria (Radiolaria) in the arctic province: Joergensenium arcticum n.sp. in the Chukchi Sea, its vertical distribution, life cycle and symbionts, and J. clevei n. sp. in the northern Norwegian Sea. Marine Micropaleontology 124, 75-94.

Harada, N. (2016) Review: Potential catastrophic reduction of sea-ice in the western Arctic Ocean –its impact on the biogeochemical cycles and marine ecosystems– Global and Planetary Change, 136, 1-17, http://dx.doi.org/10.1016/j.gloplacha.2015.11.005 [Invited review article]

Lamy F., H.W. Arz, R. Kilian, C.B. Lange, L. Lembke-Jene, M. Wengler, J. Kaiser, O. Baeza Urrea, I.R. Hall, N. Harada & R. Tiedemann (2015) Glacial reduction and millennial-scale variations in Drake Passage throughflow PNAS doi/10.1073/pnas.1509203112.

Onodera, J., E. Watanabe, S. Nishino, N. Harada (2014) Distribution and vertical fluxes of silicoflagellates, eburidians and the endoskeletal dinoflagellate Actiniscus in the in the western Arctic Ocean. Polar Biology (accepted)　22 Aug 2015

Onodera J., E. Watanabe, N. Harada, M. Honda (2015) Diatom flux reflects water-mass conditions on the southern Northwind Abyssal Plain, Arctic Ocean. Biogeosciences, 12, 1373-1385.

Ikenoue T., K. R. Bjørklund, S. B. Kruglikova, J. Onodera, K. Kimoto, N.　Harada (2015) Flux variations and vertical distributions of siliceous Rhizaria (Radiolaria and Phaeodaria) in the western Arctic Ocean: indices of environmental changes. Biogeosciences bg-2014-495.　北極海特集号「Catastrophic reduction of sea ice in the Arctic Ocean – its impact on the marine organisms and ecosystems in the polar region」

Matsuno K., A. Yamaguchi, A. Fujiwara, J. Onodera, E. Watanabe, N. Harada, T. Kikuchi (2015) Seasonal changes in the population structure of dominant planktonic copepods collected using a sediment trap moored in the western Arctic Ocean. Journal of Natural History (accepted 2015/2/6). doi:10.1080/00222933.2015.1022613.

Placencia, J.A., N. Harada, R. Torres, C.B. Lange, D. Hebbeln (2010) Surface circulation patterns and the pathways of sea surface carbon dioxide (CO₂) off northern Chile (~27.5°S) between 30 and 10 kyr BP: global and/or local forcing? Climate of the Past Duscussions, 6, 347-368. www.clim-past-discuss.net/6/347/2010/

Watanabe, E., J. Onodera, N. Harada, M. C. Honda, K. Kimoto, T. Kikuchi, S. Nishino, K. Matsuno, A. Yamaguchi, A. Ishida, M. J. Kishi (2014) Enhanced role of eddies in the Arctic marine biological pump, Nature Comm., doi: 10.1038/ncomms4950.

Seki, O. J. Bendle, N. Harada, M. Kobayashi, S. Nagao, K. Sawada, T. Sakamoto (2014) Assessment and calibration of TEX86 paleothermometry in the Sea of Okhotsk sub-polar North Pacific region: Implications for paleoceanography. Progress in Oceanography, 126, 254-266.

Park, Y.-H., M. Yamamoto, S.-I. Nam, T. Irino, L. Polyak, N. Harada, K. Nagashima, B.-K. Khim, K. Chikita, S.-I. Saitoh (2014) Distribution, source and transportation of glycerol dialkyl glycerol tetraethers in surface sediments from the western Arctic Ocean and the northern Bering Sea. Marine Chemistry,165, 10-24.

Okazaki Y., K. Kimoto, H. Asahi, M. Sato, Y. Nakamura, N. Harada (2014) Glacial to deglacial ventilation and productivity changes in the southern Okhotsk Sea. Paleogeograpy, Paleoclimatology, Paleoecology, 395, 53-66.

Harada, N., K. Katsuki, M. Nakagawa, A. Matsumoto, O. Seki, J. A. Addison, B. P. Finny, M. Sato (2014) Holocene sea surface temperature and sea ice extent in the Okhotsk and Bering Seas. Progress in Oceanography 126, 242-253.

Bae, S.W., K.E. Lee, Y.G. Park, K. Kimoto, K. Ikehara, N. Harada (2014) Sea surface temperature and salinity changes near the Soya Strait during the last 19 ka, Quaternary International 344, 200-210.

Shiroya K., Y. Yokoyama, S. Obrochta, N. Harada, Y. Miyairi, H.i Matsuzaki (2013) Melting history of the Patagonian Ice Sheet during Termination I inferred from marine sediments. Geochemical Journal, 47, 107-117.

Matsuno K., A. Yamaguchi, A. Fujiwara, J. Onodera, I. Imai, S. Chiba, N. Harada, T. Kikuchi (2013) Seasonal changes in mesozooplankton swimmers collected by sediment trap moored at a single station of Northwind Abyssal Plain in the western Arctic Ocean. Journal of Plankton Research 36, 490–502, doi:10.1093/plankt/fbt092.

Harada N., C. B. Lange, M. E. Marchant, M. Sato, N. Ahagon, S. Pantoja, U. Ninnemann (2013) Deglacial–Holocene changes in sea surface temperature, water mass characteristics, and the nitrogen cycle in the Pacific entrance of Strait of Magellan. Paleogeograpy, Paleoclimatology, Paleoecology, 375, 125-135, http://dx.doi.org/10.1016/j.palaeo.2013.02.022.

Fukuda, M., N. Harada, M. Sato, C. B. Lange, N. Ahagon, H. Kawakami, W. Miyashita, S. Pantoja, T. Matsumoto, I. Motoyama (2013) ²³⁰Th-normalized fluxes of biogenic components from the central and southernmost Chilean margin over the past 22,000 years. Geochemical Journal, 47, 119-135.

Rella S., R. Tada, K. Nagashima , M. Ikehara , T. itaki , K. Ohkushi , T. Sakamoto, N. Harada , M. Uchida (2012) Abrupt changes of intermediate water properties on the northeastern slope of the Bering Sea during the last glacial and deglacial period. Paleoceanography, 27, PA3203, doi:10.1029/2011PA002205.

Harada N., T. Ueno, Y. Sagawa, Y. Taketomo, Y. Hashimoto, Y. Matsuura, K. Sugiyama (2012) Changes in physical and chemical properties of archived sediment. JAMSTEC Report of Research and Development 15, 47–76.

Harada N., M. Sato, K. Oguri, K. Hagino, Y. Okazaki, K. Katsuki, Y. Tsuji, K.-H. Shin, O. Tadai, S. Saitoh, H. Narita, S. Konno, R. W. Jordan, Y. Shiraiwa, J. Grebmeier (2012) Recent environmental changes enhance coccolithophorid blooms in the Bering Sea. Global Biogeochemical Cycles, 26, GB2036, doi:10.1029/2011GB004177.

Harada N., M. Sato, O. Seki, A. Timmermann, H. Moossen, J. Bendle, Y. Nakamura, K. Kimoto, Y. Okazaki, K. Nagashima, S.A. Gorbarenko, A. Ijiri, T. Nakatsuka, L. Menviel, M.O. Chikamoto, A. Abe-Ouchi, S. Schouten (2012) Sea surface and subsurface temperature changes in the Okhotsk Sea and adjacent North Pacific during the Last Glacial Maximum and deglaciation. Deep-Sea Res. II, 61–64, 93–105.

Harada N., H. Kawakami, M. Fukuda, W. Miyashita, T. Matsumoto (2012) 230Th-normalized fluxes of biogenic components from the central Chilean margin during the late Quaternary. Journal of Geology (in Japanese with English abstract) 121(3), 555–569.

Asahara Y., F. Takeuchi, K. Nagashima, N. Harada, K. Yamamoto, K. Oguri, and O. Tadai (2012) Provenance of terrigenous detritus of the surface sediments in the Bering and Chukchi Seas as derived from Sr and Nd isotopes: implications for recent climate change in the Arctic regions. Deep-Sea Res. II, 61–64, 155–171.

Chikamoto M.O., L. Menviel, A. Abe-Ouchi, R. Ohgaitoa, A. Timmermann, Y. Okazaki, N. Harada, A. Oka (2012) Variability in North Pacific intermediate water ventilation during Heinrich events in two coupled climate models. Deep-Sea Res. II, 61–64, 114–126.

Derkachev A.N., Nikolaeva N.A., Gorbarenko S.A., Harada N., Sakamoto T., Iijima K., Sakhno V.G (2012) Characteristics and ages of the volcanic ash layers in the central Okhotsk Sea sediments during the last 350 kyr. Deep-Sea Res. II, 61–64, 179–192.

Gorbarenko, S. A., N. Harada, M. I. Malakhov, T. A. Velivetskaya, Y. P. Vasilenko, A. A. Bosin, A. N. Derkachev, E. L. Goldberg, A. V. Ignatiev (2012) Responses of the Okhotsk Sea environment and sedimentology on global climate changes at the orbital and millennial scale during the last 350 kyr. Deep-Sea Res. II, 61–64, 73–84.

Khim, B.-K., T. Sakamoto, N. Harada (2012) Reconstruction of surface water conditions in the central region of the Okhotsk Sea during the last 180 kyrs Deep-Sea Res. II, 61–64, 63–72.

Menviel, L., A. Timmermann, O. Elison Timm, A. Abe-Ouchi, M.O. Chikamoto, N. Harada, R. Ohgaito, Y. Okazaki (2012) The Pacific Meridional Overturning Circulation and its impact on global climate and the carbon cycle: idealized modeling experiments. Deep-Sea Res. II, 61–64, 106–113.

Nagashima K., Y. Asahara, F.i Takeuchi, N. Harada, S. Toyoda, R. Tada (2012) Contribution of detrital materials from the Yukon River to the continental shelf sediments of the Bering Sea based on the ESR intensity and crystallinity of quartz. Deep-Sea Res. II, 61–64, 145–154.

Oguri, K., N. Harada, O. Tadai (2012) Excess 210Pb and 137Cs concentrations, mass accumulation rates, and sedimentary processes on the Bering Sea continental shelf. Deep-Sea Res. II, 61–64, 193–204.

Seki, O., N. Harada, M. Sato, A. Ijiri, T. Nakatsuka, (2012) Millennial scale variability of terrestrial organic matter input off Sakhalin, the Sea of Okhotsk. Deep-Sea Res. II, 61–64, 85–92.

Torres R. S. Pantoja, N. Harada, H. E. Gonzalez, G. Daneri, M. Frangopulos, J. A. Rutllant, C. M. Duarte, S. Rúiz-Halpern, E. Mayol, M. Fukasawa (2011) Air-sea CO2 fluxes along the coast of Chile: From CO2 outgassing in central northern upwelling waters to CO2 uptake in southern Patagonian fjords. JGR 116(C9), doi:10.1029/2010JC006344.

Placencia, J.A., N. Harada, R. Torres, C.B. Lange, D. Hebbeln (2010) Surface circulation patterns and the pathways of sea surface carbon dioxide (CO₂) off northern Chile (~27.5°S) between 30 and 10 kyr BP: global and/or local forcing? Climate of the Past Duscussions, 6, 347-368. www.clim-past-discuss.net/6/347/2010/

Gorbarenko S.A., N. Harada, M. I. Malakhov, Y. P. Vasilenko, A. A. Bosin, E. L. Goldberg (2010) Orbital and millennial-scale environmental and sedimentological changes in the Okhotsk Sea during the last 350 kyr, Global and Planetary Change, 72, 79-85.

Harada N. (2010) Racemization of Amino acid for Quaternary dating, Degital book of the latest Quaternary, Memorial issue of the 50th anniversary of Japan Association for Quaternary Research, (in Japanese).

Okazaki Y., A. Timmermann, L. Menviel, N. Harada, A. Abe-Ouchi, M.O. Chikamoto, A. Mouchet, H. Asahi (2010) Deep water formation in the North Pacific during the last glacial termination. Science, 329, 200-204.

Harada N., Kimoto K., Okazaki Y., Nagashima K., Timmermann A. and Abe-Ouchi A. (2009) Millennial time scale changes in surface to intermediate-deep layer circulation recorded in the sediment cores from the northwestern North Pacific, The Quaternary Research, 48(3), 179-194 (in Japanese with English abstract).

Katsuki K., Khim B.-K., Itaki T., Harada N., Sakai H., Ikeda T., Takahashi K., Okazaki Y. and Asahi H. (2009) Land-sea linkage of Holocene paleoclimate on the Southern Bering Continental Shelf, The Holocene, 19, 745-754.

Malakhov, M.I., S.A. Gorbarenko, G.Yu. Malakhova, N. Harada, Yu.P.Vasilenko, A.A. Bosin, E.L. Goldberg, and A.N. Derkachev (2009) Petromagnetic parameters of bottom sediments as indications of the climatic and environmental changes in the central part of the Sea of Okhotsk during the last 350 thousand years, Russian Geology and Geophysics, 50, 973-982, doi:10.1016/j.rgg.2009.10.006.

Gorbarenko S., Harada N., Malakhov M.I., Vasilenko Yu.P., Bosin A.A., Gol’dberg E. L. (2008) Millennium-scale climatic and environmental oscillations in the Sea of Okhotsk in response to global changes during the last 190 ka. Doklady Earth Sciences, 423A(9), 1410?1413, doi:10.1134/S1028334X08090183.

Harada N., Sato M., Sakamoto T. (2008) Freshwater impacts recorded in tetraunsaturated alkenones and alkenone-SSTs from the Okhotsk Sea across millennial-scale cycles, Paleocenography 23, PA3201, doi:10.1029/2006PA001410.

Jimenez-Espejo J. F., F. Martinez-Ruiz, T. Sakamoto, K. Iijima, D. Gallego-Torres, N. Harada　(2007) Paleoenvironmental changes in the western Mediterranean since the Last Glacial Maximum: high resolution multi proxy record from the Algero-Balearic basin. Paleogeogr., Paleoclimatol., Paleoecol., 246, 292-306.

Konno, S., Harada, N., Narita, H., Jordan, R.W. (2007) Living Braarudosphaera bigelowii (Gran & Braarud) Deflandre in the Bering Sea. J. Nannoplankton Res. 29(2),78-87.

Konno, S., Ohira, R., Komuro, C., Harada, N., Jordan, R.W. (2007) Six new taxa of subarctic siliceous nannoplankton (Parmales, Chrysophyceae). J. Nannoplankton Res., 29(2), 108-128.

Shigemitsu M., Narita H., Watanabe Y.W., Harada N., Tsunogai S. (2007) Ba, Si, U, Al, Sc, La, Th, C and 13C / 12C in a sediment core in the Western Subarctic Pacific as proxies of past biological production. Mar. Chem., 106, 442-455. doi:10.1016/j.marchem.2007.04.004.

Harada N., Shiraishi A., Sato M. and Honda M. (2006) Characteristics of alkenone particles in the northwestern North Pacific. Geochim Cosmochim. Acta, 70, 2045-2062.

Harada N., N. Ahagon, T. Sakamoto, M. Uchida, M. Ikehara, Y. Shibata (2006) Rapid fluctuation of alkenone temperature in the southwestern Okhotsk Sea during the past 120 kyr. Global and Planetary Change, 53, 29-46.

Sakamoto T., Ikehara M., Kanamatsu T., Harada N., Uchida M., Aoki K., Sakai H., Iijima K., Shibata Y., Takahashi K., Kawahata H. (2006) Millennial-scale variations of sea-ice expansion and their relation to Okhotsk Intermediate Water formation in the southwestern part of the Okhotsk Sea during the past 120 kyr: Results from IMAGES core MD01-2412 analyses Global and Planetary Change, 53, 58-77.

Nakazawa F., K. Ohta, N. Harada, K. Fujita, M. Naka (2005) Determination of amino acid in ice samples. Bulletin of Glaciological Research, 22, 69-74.

Harada N., N. Ahagon, M. Uchida, M. Murayama (2004) Northward and southward migrations of frontal zones during the past 40 kyr in the Kuroshio?Oyashio transition area. Geochem. Geophys. Geosyst., 5(9), doi:10.1029/2004GC000740.

Harada N., K.-H. Shin, A. Murata, M. Uchida, T. Nakatani (2003) Characteristics of alkenone synthesized by a bloom of Emiliania huxleyi in the Bering Sea. Geochim. Cosmochim. Acta, 67, 1507-1519.

Harada N., T. Kondo, K. Fukuma, M. Uchida, T. Nakamura, M. Iwai, M. Murayama, T. Sugawara and M. Kusakabe (2002) Is amino acid chronology available to estimate geological age of siliceous sediment? Earth Planet. Sci. Lett., 198, 257-266.

Narita H., M. Sato, S. Tsunogai, M Ikehara, T. Nakatsuka, M. Wakatsuchi, N. Harada, Y. Ujiie (2002) Biogenic opal indicating less productive northwestern North Pacific during the glacial ages. Geophys. Res. Lett., 29, 22-1~4.

Shin K.-H., N. Tanaka, N. Harada, J.-C. Marty (2002) Production and turnover rates of C37 alkenones in the eastern Bering Sea: implication of the mechanism of long duration of Emiliania huxleyi bloom. Prog. Oceanogr., 55, 113-129.

Harada N., N. Handa, K. Harada and H. Matsuoka (2001) Alkenone records in sinking material from the central Equatorial Pacific. Deep-Sea Res. I, 48, 891-907.

Uchida M., Y. Shibata, K. Kawamura, Y. Kumamoto, M. Yoneda, K. Ohkushi, N. Harada, M. Hirota, H. Mukai, A. Tanaka, M. Kusakabe, M. Morita (2001) Compound-specific radiocarbon ages of fatty acids from bathyal sediments in the western North Pacific. Radiocarbon, 43, 949-956.

Kumamoto Y., M. C. Honda, A. Murata, N. Harada, K. Hayashi, N. Kisen, M. Katagiri, K. Nakao, J. R. Southon (2000) Distribution of radiocarbon in the western North Pacific: preliminary results from MR97-02 cruise in 1997. Nuclear Instruments and Methods in Physics Research B 172, 495-500.

Oguri K., E. Matsumoto, Y. Saito, M. Honda, N. Harada, M. Kusakabe (2000) Evidence for terrestrial transport due to the sea level increase: case of the East China Sea continental shelf. Geophys. Res. Lett., 27, 3893-3896.

Nakatsuka T., N. Handa, N. Harada, T. Sugimoto and S. Imaizumi (1998) Origin and decomposition of sinking particulate organic matter in the deep water column inferred from the vertical distributions of its δ15N, δ13C and δ14C. Deep-Sea Res. I, 44, 1957-1979.

Harada N., N. Handa, T. Oba, H. Matsuoka, K. Kimoto and M. Kusakabe (1997) Age determination of marine sediments in the western North Pacific by asparitc acid chronology. J. Oceanogr., 53, 1-7.

Harada N., N. Handa, M. Ito, T. Oba and E. Matsumoto (1996) Chronology of marine sediments by the racemization reaction of aspartic acid in planktonic foraminifera. Org. Geochem., 24, 921-930.

Harada N. and N. Handa (1995) Amino acid chronology in the fossil planktonic foraminifera, Pulleniatina obliquiloculata from Pacific Ocean. Geophys. Res. Lett., 22, 2353-2356.

Harada N., N. Handa, M. Fukuchi and R. Ishiwatari (1995) Source of hydrocarbons in marine sediments in Lutzow-Holm Bay, Antarctica. Org. Geochem., 23, 229-237.

Harada N., N. Handa, M. Fukuchi and R. Ishiwatari (1995) Hydrocarbon record of a marine sediment core from Lutzow-Holm Bay, Antarctica. Proceedings of the NIPR Symposium on Polar Biology, 8, 163-176.

Igarashi A., N. Harada, K. Moriwaki (1995) Marine fossils of 30-40 ka in raised beach deposits, and late Pleistocene glacial history around Lutzow-Holm Bay, east Antarctica. Proceedings of the NIPR Symposium on Antarctic Geosciences, 8, 219-229.

Igarashi A., H. Numanami, Y. Tsuchiya, N. Harada, M. Fukuchi, T. Saito (1995) Radiocarbon ages of molluscan shell fossils in raised beach deposits along the east coast of Lutzow-Holm Bay, Antarctica, determined by Accelerator Mass-Spectrometry. Proceedings of the NIPR Symposium on Polar Biology, 8, 154-162.

Nakatsuka T., N. Harada, E. Matsumoto, N. Handa, T. Oba, M. Ikehara, H. Matsuoka, K. Kimoto (1995) Glacial-interglacial migration of an upwelling field in the western equatorial Pacific recorded by sediment 15N/14N. Geophys. Res. Lett., 22, 2525-2528.

Odate T., N. Harada, M. Fukuchi (1993) Comparisons of N,N-Dimethylformamide and 90% acetone as an extraction solvent for fluorometric determination of Chlorophyll a from natural phytoplankton communities in the Southern Ocean. Antarctic Record, 37(3) , 260-264.

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