Hisatake Okada

4.1k total citations · 2 hit papers
48 papers, 3.0k citations indexed

About

Hisatake Okada is a scholar working on Atmospheric Science, Paleontology and Ecology. According to data from OpenAlex, Hisatake Okada has authored 48 papers receiving a total of 3.0k indexed citations (citations by other indexed papers that have themselves been cited), including 23 papers in Atmospheric Science, 19 papers in Paleontology and 18 papers in Ecology. Recurrent topics in Hisatake Okada's work include Geology and Paleoclimatology Research (22 papers), Paleontology and Stratigraphy of Fossils (17 papers) and Isotope Analysis in Ecology (12 papers). Hisatake Okada is often cited by papers focused on Geology and Paleoclimatology Research (22 papers), Paleontology and Stratigraphy of Fossils (17 papers) and Isotope Analysis in Ecology (12 papers). Hisatake Okada collaborates with scholars based in Japan, United States and Philippines. Hisatake Okada's co-authors include David Bukry, Susumu Honjo, Andrew McIntyre, Kyoko Hagino, Hiromi Matsuoka, Patricia Wells, Yoshiaki Aita, Hiroshi Kitazato, Tadamichi Oba and Hugh E. G. Morgans and has published in prestigious journals such as Environmental Microbiology, Palaeogeography Palaeoclimatology Palaeoecology and Organic Geochemistry.

In The Last Decade

Hisatake Okada

44 papers receiving 2.7k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973; 1975)

1980 943 citations Hisatake Okada, David Bukry Marine Micropaleontology profile →
The distribution of oceanic coccolithophorids in the Pacific

1973 513 citations Hisatake Okada, Susumu Honjo profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Hisatake Okada Japan	21	1.9k	1.3k	975	930	510	48	3.0k
Hans R. Thierstein Switzerland	29	2.3k 1.2×	1.5k 1.2×	1.5k 1.5×	1.0k 1.1×	347 0.7×	45	3.5k
Margaret Lois Delaney United States	21	2.0k 1.1×	871 0.7×	1.2k 1.2×	799 0.9×	254 0.5×	31	2.8k
Ulrich von Rad Germany	24	1.9k 1.0×	801 0.6×	506 0.5×	697 0.7×	583 1.1×	60	2.9k
Richard K. Olsson United States	29	2.5k 1.3×	865 0.7×	2.1k 2.2×	689 0.7×	680 1.3×	81	3.5k
Torsten Bickert Germany	35	3.0k 1.6×	939 0.7×	1.4k 1.5×	1.1k 1.2×	387 0.8×	69	3.7k
S.R. Troelstra Netherlands	30	2.3k 1.2×	866 0.7×	492 0.5×	1.2k 1.3×	297 0.6×	86	3.1k
Domenico Rio Italy	31	2.7k 1.5×	863 0.7×	1.4k 1.5×	716 0.8×	898 1.8×	65	3.4k
M. A. Hall United Kingdom	12	2.2k 1.2×	688 0.5×	879 0.9×	1.0k 1.1×	201 0.4×	17	2.5k
David Bukry United States	21	1.5k 0.8×	561 0.4×	923 0.9×	493 0.5×	611 1.2×	61	2.3k
Christopher J. Hollis New Zealand	33	2.5k 1.3×	790 0.6×	1.7k 1.7×	744 0.8×	853 1.7×	99	3.6k

Countries citing papers authored by Hisatake Okada

Since Specialization

Citations

This map shows the geographic impact of Hisatake Okada'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 Hisatake Okada with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hisatake Okada more than expected).

Fields of papers citing papers by Hisatake Okada

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hisatake Okada. 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 Hisatake Okada. The network helps show where Hisatake Okada may publish in the future.

Co-authorship network of co-authors of Hisatake Okada

This figure shows the co-authorship network connecting the top 25 collaborators of Hisatake Okada. A scholar is included among the top collaborators of Hisatake Okada 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 Hisatake Okada. Hisatake Okada is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Hagino, Kyoko, El Mahdi Bendif, J. R. Young, et al.. (2011). NEW EVIDENCE FOR MORPHOLOGICAL AND GENETIC VARIATION IN THE COSMOPOLITAN COCCOLITHOPHORE EMILIANIA HUXLEYI (PRYMNESIOPHYCEAE) FROM THE COX1b‐ATP4 GENES¹. Journal of Phycology. 47(5). 1164–1176. 65 indexed citations

Ohkouchi, Naohiko, Yoji Nakajima, Hisatake Okada, et al.. (2005). Biogeochemical processes in the saline meromictic Lake Kaiike, Japan: implications from molecular isotopic evidences of photosynthetic pigments. Environmental Microbiology. 7(7). 1009–1016. 69 indexed citations

Hagino, Kyoko, Hisatake Okada, & Hiromi Matsuoka. (2005). Coccolithophore assemblages and morphotypes of Emiliania huxleyi in the boundary zone between the cold Oyashio and warm Kuroshio currents off the coast of Japan. Marine Micropaleontology. 55(1-2). 19–47. 63 indexed citations

Hagino, Kyoko & Hisatake Okada. (2005). Intra- and infra-specific morphological variation in selected coccolithophore species in the equatorial and subequatorial Pacific Ocean. Marine Micropaleontology. 58(3). 184–206. 41 indexed citations

Oba, Tadamichi, et al.. (2004). Late Quaternary paleoceanography deduced from coccolith assemblages in a piston core recovered off the central Japan coast. Marine Micropaleontology. 52(1-4). 277–297. 21 indexed citations

Nakajima, Yoji, Hisatake Okada, K. Oguri, et al.. (2003). Distribution of chloropigments in suspended particulate matter and benthic microbial mat of a meromictic lake, Lake Kaiike, Japan. Environmental Microbiology. 5(11). 1103–1110. 22 indexed citations

Okada, Hisatake, et al.. (2001). Paleoceanography for the last 195,000 years in the Solomon Sea (ODP Site 1109) by means of calcareous nannofossils. Marine Micropaleontology. 42(1-2). 45–59. 5 indexed citations

Oba, Tadamichi, et al.. (2000). 18. DATA REPORT: OXYGEN ISOTOPIC RECORD OF THE LAST 0.8 M.Y. AT THE BLAKE RIDGE, SITE 994C 1. 164. 173–175. 3 indexed citations

Okada, Hisatake, et al.. (1997). Environment changes recorded in the Himalayan Range and Indian Ocean. Monsoon and Quaternary paleoceanography in the Indian Ocean.. The Journal of the Geological Society of Japan. 103(3). 304–312. 3 indexed citations

10.

Kaiho, Kunio, Tetsuya Arinobu, Ryoshi Ishiwatari, et al.. (1996). Latest Paleocene benthic foraminiferal extinction and environmental changes at Tawanui, New Zealand. Paleoceanography. 11(4). 447–465. 122 indexed citations

11.

Okada, Hisatake. (1992). Calcareous nannofossils and biostratigraphy of the Paleogene sequences of the northern Kyushu, Japan. The Journal of the Geological Society of Japan. 98(6). 509–528_2. 37 indexed citations

12.

Okada, Hakuyu, et al.. (1989). Microfossil Assemblages from the Late Jurassic to Early Cretaceous Nikoro Pelagic Sediments, Tokoro Belt, Hokkaido, Japan. Kyushu University Institutional Repository (QIR) (Kyushu University). 26(3). 193–214. 11 indexed citations

13.

Chinzei, Kiyotaka, Kantaro Fujioka, Hiroshi Kitazato, et al.. (1987). Postglacial environmental change of the Pacific Ocean off the coasts of central Japan. Marine Micropaleontology. 11(4). 273–291. 121 indexed citations

14.

Takayanagi, Yokichi, Tsunemasa Saito, Hakuyu Okada, et al.. (1987). Mid-Quaternary Paleoceanographic Trend in Near-shore Waters of the Northwest Pacific : A Case Study Based on an Offshore Well. Medical Entomology and Zoology. 57(2). 1 indexed citations

15.

Saito, Tsunemasa & Hisatake Okada. (1987). . Marine Micropaleontology. 12. 106–107.

16.

Okada, Hisatake & David Bukry. (1980). Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973; 1975). Marine Micropaleontology. 5. 321–325. 943 indexed citations breakdown →

17.

Honjo, Susumu & Hisatake Okada. (1974). Community Structure of Coccolithophores in the Photic Layer of the Mid-Pacific. Micropaleontology. 20(2). 209–209. 138 indexed citations

18.

Okada, Hisatake. (1970). Surface distribution of coccolithophore in the North and Equatrial Pacific. The Journal of the Geological Society of Japan. 76(11). 537–544. 2 indexed citations

19.

Honjo, Susumu & Hisatake Okada. (1968). Scanning Electron Microscopy of Planktonic Foraminifera : A Preparation Technique. Hokkaido University Collection of Scholarly and Academic Papers (Hokkaido University). 14(1). 71–76. 2 indexed citations

20.

Honjo, Susumu, et al.. (1967). Study of Nannofossils by the Scanning Electron Microscope. Hokkaido University Collection of Scholarly and Academic Papers (Hokkaido University). 13(4). 427–431. 1 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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