Hajime Obata

5.9k total citations
134 papers, 3.9k citations indexed

About

Hajime Obata is a scholar working on Oceanography, Geochemistry and Petrology and Pollution. According to data from OpenAlex, Hajime Obata has authored 134 papers receiving a total of 3.9k indexed citations (citations by other indexed papers that have themselves been cited), including 61 papers in Oceanography, 40 papers in Geochemistry and Petrology and 35 papers in Pollution. Recurrent topics in Hajime Obata's work include Marine and coastal ecosystems (56 papers), Heavy metals in environment (34 papers) and Geochemistry and Elemental Analysis (33 papers). Hajime Obata is often cited by papers focused on Marine and coastal ecosystems (56 papers), Heavy metals in environment (34 papers) and Geochemistry and Elemental Analysis (33 papers). Hajime Obata collaborates with scholars based in Japan, United States and Indonesia. Hajime Obata's co-authors include Toshitaka Gamo, Eiichiro Nakayama, Hajime Karatani, Jun Nishioka, Shigenobu Takeda, Hirofumi Tazoe, Hiroshi Ogawa, Yoshiyuki Nozaki, Constant M.G. van den Berg and Ayako Okubo and has published in prestigious journals such as Proceedings of the National Academy of Sciences, Journal of Geophysical Research Atmospheres and Analytical Chemistry.

In The Last Decade

Hajime Obata

130 papers receiving 3.8k citations

Peers

Hajime Obata
Jingfeng Wu United States
Maeve C. Lohan United Kingdom
Michael J. Ellwood Australia
Alan M. Shiller United States
Jay T. Cullen Canada
Yoshiki Sohrin Japan
Sylvia G. Sander New Zealand
Gregory A. Cutter United States
Ashley T. Townsend Australia
Loes J. A. Gerringa Netherlands
Jingfeng Wu United States
Hajime Obata
Citations per year, relative to Hajime Obata Hajime Obata (= 1×) peers Jingfeng Wu

Countries citing papers authored by Hajime Obata

Since Specialization
Citations

This map shows the geographic impact of Hajime Obata's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Hajime Obata with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hajime Obata more than expected).

Fields of papers citing papers by Hajime Obata

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hajime Obata. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Hajime Obata. The network helps show where Hajime Obata may publish in the future.

Co-authorship network of co-authors of Hajime Obata

This figure shows the co-authorship network connecting the top 25 collaborators of Hajime Obata. A scholar is included among the top collaborators of Hajime Obata based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Hajime Obata. Hajime Obata is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Wong, Marty Kwok‐Shing, Jun Inoue, Yuan Lin, et al.. (2025). Environmental DNA of small pelagic fish in the deep ocean. Progress In Oceanography. 241. 103625–103625.
2.
Sugie, Koji, Naoto F. Ishikawa, Nanako O. Ogawa, et al.. (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(1). 1 indexed citations
3.
Obata, Hajime, et al.. (2024). Dissolved Fe(II) and its oxidation rates in the Kuroshio area, subarctic Pacific, and Bering Sea. GEOCHEMICAL JOURNAL. 58(2). 71–79.
4.
Wong, Kuo Hong, Hajime Obata, Taejin Kim, et al.. (2024). Dissolved zinc in the western Bering Sea and near Kamchatka Strait: A coastal source and transport to the subarctic Pacific. Marine Chemistry. 260. 104375–104375. 2 indexed citations
5.
Wong, Kuo Hong, et al.. (2023). Distributions of humic substances in an estuarine region (Otsuchi Bay, Japan) determined using electrochemical and optical methods. Marine Chemistry. 256. 104301–104301. 5 indexed citations
6.
Wong, Kuo Hong, et al.. (2023). Dissolved trace metals (Fe, Mn, Pb, Cd, Cu, and Zn) in the eastern Indian Ocean. Marine Chemistry. 248. 104208–104208. 9 indexed citations
7.
8.
Takahata, Naoto, Kotaro Shirai, Takanori Kagoshima, et al.. (2021). Monitoring the magmatic activity and volatile fluxes of an actively degassing submarine caldera in southern Japan. Geochimica et Cosmochimica Acta. 317. 106–117. 1 indexed citations
9.
Takahata, Naoto, et al.. (2018). Distribution of helium-3 plumes and deep-sea circulation in the central Indian Ocean. Terrestrial Atmospheric and Oceanic Sciences. 29(3). 331–340. 7 indexed citations
10.
Firdaus, M. Lutfi, Santhy Wyantuti, Yeni Wahyuni Hartati, et al.. (2017). Colorimetric Detection of Mercury(II) Ion in Aqueous Solution Using Silver Nanoparticles. Analytical Sciences. 33(7). 831–837. 131 indexed citations
11.
Mashio, Asami S., Hajime Obata, & Toshitaka Gamo. (2017). Dissolved Platinum Concentrations in Coastal Seawater: Boso to Sanriku Areas, Japan. Archives of Environmental Contamination and Toxicology. 73(2). 240–246. 16 indexed citations
12.
13.
Kawagucci, Shinsuke, et al.. (2014). Molecular hydrogen and carbon monoxide in seawater in an area adjacent to Kuroshio and Honshu Island in Japan. Marine Chemistry. 164. 75–83. 4 indexed citations
14.
Tazoe, Hirofumi, Takeyasu Yamagata, Hajime Obata, & Hisao Nagai. (2014). Determination of picomolar beryllium levels in seawater with inductively coupled plasma mass spectrometry following silica-gel preconcentration. Analytica Chimica Acta. 852. 74–81. 13 indexed citations
15.
Kuma, Kenshi, Atsushi Ooki, Yoshiko Kondo, et al.. (2014). Laterally spreading iron, humic-like dissolved organic matter and nutrients in cold, dense subsurface water of the Arctic Ocean. Scientific Reports. 4(1). 6775–6775. 55 indexed citations
16.
Cutter, Gregory A., Per Andersson, Peter Croot, et al.. (2010). Sampling and Sample-handling Protocols for GEOTRACES Cruises. Journal of Oral Science. 45(2). 107–10. 192 indexed citations
17.
Kondo, Yoshiko, et al.. (2010). Fe(II) distribution in the Arabian Sea oxygen minimum zone and Western tropical Indian Ocean from GEOTRACES KH-09-5. Geochimica et Cosmochimica Acta. 74(12). 528. 1 indexed citations
18.
Maruo, Masahiro, et al.. (2007). Distribution and speciation of Fe(II) in the waters of Lake Biwa and inflowing rivers. Japanese Journal of Limnology (Rikusuigaku Zasshi). 68(3). 415–423. 2 indexed citations
19.
Doi, Takashi, Hajime Obata, & Masahiro Maruo. (2004). Shipboard analysis of picomolar levels of manganese in seawater by chelating resin concentration and chemiluminescence detection. Analytical and Bioanalytical Chemistry. 378(5). 1288–1293. 22 indexed citations
20.
Obata, Hajime, et al.. (2000). Distribution of cadmium in soybean and quality of soybean seed under cadmium stress. Acta Scientiae Circumstantiae. 20(4). 510–512. 2 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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