Ryoshi Ishiwatari

6.9k total citations · 1 hit paper
139 papers, 5.4k citations indexed

About

Ryoshi Ishiwatari is a scholar working on Mechanics of Materials, Ecology and Atmospheric Science. According to data from OpenAlex, Ryoshi Ishiwatari has authored 139 papers receiving a total of 5.4k indexed citations (citations by other indexed papers that have themselves been cited), including 66 papers in Mechanics of Materials, 53 papers in Ecology and 40 papers in Atmospheric Science. Recurrent topics in Ryoshi Ishiwatari's work include Hydrocarbon exploration and reservoir analysis (65 papers), Isotope Analysis in Ecology (50 papers) and Geology and Paleoclimatology Research (39 papers). Ryoshi Ishiwatari is often cited by papers focused on Hydrocarbon exploration and reservoir analysis (65 papers), Isotope Analysis in Ecology (50 papers) and Geology and Paleoclimatology Research (39 papers). Ryoshi Ishiwatari collaborates with scholars based in Japan, United States and Spain. Ryoshi Ishiwatari's co-authors include Philip A. Meyers, Hideshige Takada, Kimitaka Kawamura, Hiroshi Naraoka, Mariko Ishiwatari, Keita Yamada, Shuichi Yamamoto, Haru Sakashita, Kazuo Fukushima and Takahide Tatsumi and has published in prestigious journals such as Nature, Environmental Science & Technology and Geochimica et Cosmochimica Acta.

In The Last Decade

Ryoshi Ishiwatari

137 papers receiving 5.1k citations

Hit Papers

Lacustrine organic geochemistry—an overview of indicators... 1993 2026 2004 2015 1993 500 1000 1.5k
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.

  1. Lacustrine organic geochemistry—an overview of indicators of organic matter sources and diagenesis in lake sediments
    1993 1.5k citations Philip A. Meyers, Ryoshi Ishiwatari Organic Geochemistry profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Ryoshi Ishiwatari Japan 36 2.1k 1.7k 1.5k 1.2k 974 139 5.4k
Robert B. Gagosian United States 40 1.7k 0.8× 972 0.6× 1.0k 0.7× 783 0.7× 1.6k 1.7× 80 4.4k
Mahlon C. Kennicutt United States 38 917 0.4× 1.7k 1.0× 842 0.5× 917 0.8× 1.4k 1.5× 110 4.6k
Fredrick G. Prahl United States 33 2.0k 0.9× 1.8k 1.0× 645 0.4× 1.1k 1.0× 1.9k 2.0× 48 4.6k
Claude Largeau France 55 1.6k 0.7× 1.4k 0.8× 4.3k 2.8× 1.4k 1.2× 1.2k 1.2× 174 10.1k
Jürgen Rullkötter Germany 51 2.3k 1.1× 1.9k 1.1× 4.1k 2.7× 1.6k 1.4× 1.2k 1.2× 169 8.4k
Walter Michaelis Germany 51 1.6k 0.7× 2.3k 1.3× 2.9k 1.9× 3.5k 3.0× 1.2k 1.3× 124 8.6k
David J. Hollander United States 37 1.7k 0.8× 1.7k 1.0× 1.3k 0.8× 991 0.8× 1.4k 1.4× 78 5.6k
J.M. Gieskes United States 44 2.1k 1.0× 760 0.4× 1.1k 0.7× 1.9k 1.6× 864 0.9× 121 6.4k
Marianne Baas Netherlands 39 2.0k 1.0× 1.8k 1.0× 1.3k 0.8× 1.2k 1.1× 1.1k 1.1× 71 4.7k
C. I. Measures United States 57 3.2k 1.5× 1.4k 0.8× 577 0.4× 1.3k 1.1× 3.6k 3.7× 137 9.2k

Countries citing papers authored by Ryoshi Ishiwatari

Since Specialization
Citations

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

Fields of papers citing papers by Ryoshi Ishiwatari

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ryoshi Ishiwatari

This figure shows the co-authorship network connecting the top 25 collaborators of Ryoshi Ishiwatari. A scholar is included among the top collaborators of Ryoshi Ishiwatari 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 Ryoshi Ishiwatari. Ryoshi Ishiwatari 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.
2.
Ishiwatari, Ryoshi, et al.. (2001). Alkenone-sea surface temperatures in the Japan Sea over the past 36 kyr: warm temperatures at the last glacial maximum. Organic Geochemistry. 32(1). 57–67. 80 indexed citations
3.
Mita, Hajime, et al.. (2000). Analysis of water-extractable dipeptides from sediments by gas chromatography-mass spectrometry. 15. 57–61. 1 indexed citations
4.
Ishiwatari, Ryoshi, et al.. (1999). Application of gas chromatography/isotope ratio mass spectrometry to petroleum geochemistry. Carbon isotopic composition of individual long chain normal alkanes in oils from Northeast Japan.. Journal of the Japanese Association for Petroleum Technology. 64(6). 551–559. 3 indexed citations
5.
Yamakita, Satoshi, et al.. (1998). Polycyclic Aromatic Hydrocarbons concentrated in organic rich black shale around Permian/Triassic boundary from Mino belt. 13. 19–25. 1 indexed citations
6.
Naraoka, Hiroshi, Keita Yamada, Kohei Matsumoto, & Ryoshi Ishiwatari. (1997). Compound-Specific Isotope Analysis of Light Elements Using Gas Chromatography/Combustion/Isotope Ratio Mass Spectrometry (GC/C/IRMS) and its Application to Geochemistry(New Approaches to Geochemistry). 31(4). 193–210. 4 indexed citations
7.
Matsumoto, Kohei, Keita Yamada, Hiroshi Naraoka, & Ryoshi Ishiwatari. (1997). Stable Carbon Isotope Analysis of Individual Sterols in Sediment Samples by Gas Chromatography/Isotope Ratio Mass Spectrometry.. Journal of the Mass Spectrometry Society of Japan. 45(6). 641–648. 3 indexed citations
8.
Ishiwatari, Mariko, Ryoshi Ishiwatari, Haru Sakashita, & Takashi Tatsumi. (1995). Application of pyrolysis-gas chromatography to the study of thermal alteration of chlorophyll-a — effect of clay minerals. Journal of Analytical and Applied Pyrolysis. 32. 153–160. 4 indexed citations
9.
Meyers, Philip A. & Ryoshi Ishiwatari. (1993). Lacustrine organic geochemistry—an overview of indicators of organic matter sources and diagenesis in lake sediments. Organic Geochemistry. 20(7). 867–900. 1526 indexed citations breakdown →
10.
Ishiwatari, Ryoshi, et al.. (1986). Carbohydrates in the sediment of Lake Yunoko - Vertical distribution and implication to their origin.. Japanese Journal of Limnology (Rikusuigaku Zasshi). 47(3). 257–267. 9 indexed citations
11.
Ochiai, Masahiro, et al.. (1986). Early diagenesis of organic matter in water of Lake Haruna. II. Carbohydrates and amino acids in suspended particle, sinking particle and sediment.. Japanese Journal of Limnology (Rikusuigaku Zasshi). 47(2). 115–120. 2 indexed citations
12.
13.
Ishiwatari, Ryoshi & Kimitaka Kawamura. (1978). Organic geochemistry of a 200-meter core sample from Lake Biwa. IV. Variation of fatty acid composition in the upper 5-meter layers.:Variation of Fatty Acid Composition in the Upper 5-meter Layers. Proceedings of the Japan Academy Series B. 54(3). 75–80. 1 indexed citations
14.
Ishiwatari, Ryoshi, et al.. (1977). Separation of Autochthonous and Allochthonous Materials in Lacustrine Sediments by Density Differences. Japanese Journal of Limnology (Rikusuigaku Zasshi). 38(3). 94–99. 8 indexed citations
15.
Koyama, Tadashirô, Nobuhiko Handa, Ryoshi Ishiwatari, et al.. (1973). Chemical studies of a 200 meter core sample from Lake Biwa-ko. Japanese Journal of Limnology (Rikusuigaku Zasshi). 34(2). 75–88. 2 indexed citations
16.
Ishiwatari, Ryoshi & Takahisa Hanya. (1973). Organic Geochemistry of a 200-meter Core Sample from Lake Biwa. I:Identification of Fatty Acids by Combined Gas Chromatography-Mass Spectrometry. Proceedings of the Japan Academy Series B. 49(9). 731–736. 7 indexed citations
17.
18.
Ishiwatari, Ryoshi. (1968). Fractionation and characterization of humic acid from a lake sediment. GEOCHEMICAL JOURNAL. 2(3-4). 175–184. 11 indexed citations
19.
Ishiwatari, Ryoshi, et al.. (1966). Compositional and Optical Characteristics of Humic Substances Extracted from Recent Lake Sediments. Nippon kagaku zassi. 87(6). 557–566,A30. 4 indexed citations
20.
Motojima, Kenji, et al.. (1961). Studies on the JRR-1 with Special Reference to the Fuel Solution, (II). Journal of the Atomic Energy Society of Japan / Atomic Energy Society of Japan. 3(1). 55–68. 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Robert B. Gagosian Breakdown of academic impact, for papers by Mahlon C. Kennicutt Breakdown of academic impact, for papers by Fredrick G. Prahl Breakdown of academic impact, for papers by Claude Largeau Breakdown of academic impact, for papers by Jürgen Rullkötter Breakdown of academic impact, for papers by Walter Michaelis Breakdown of academic impact, for papers by David J. Hollander Breakdown of academic impact, for papers by J.M. Gieskes Breakdown of academic impact, for papers by Marianne Baas Breakdown of academic impact, for papers by C. I. Measures
Rankless by CCL
2026