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Hiroshi Naraoka

Hiroshi Naraoka

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Environmental Sciences 47 5739 5501 101 98 307 9231

Hiroshi Naraoka publications per year

The chart shows the history of publications by Hiroshi Naraoka between 1984 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hiroshi Naraoka published across 42 years, from 1984 to 2025, averaging 8.1 papers a year. Output peaked at 46 publications in 2023. 38 of the 339 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 1984 to 2025. Vertical axis: number of publications, 0 to 46. Peak 46 publications in 2023. 1984: 1 publication 1985: 0 publications 1986: 3 publications 1987: 2 publications 1988: 1 publication 1989: 2 publications 1990: 2 publications 1991: 2 publications 1992: 0 publications 1993: 2 publications 1994: 2 publications 1995: 2 publications 1996: 1 publication 1997: 5 publications 1998: 1 publication 1999: 4 publications 2000: 8 publications 2001: 3 publications 2002: 4 publications 2003: 9 publications 2004: 8 publications 2005: 10 publications 2006: 7 publications 2007: 7 publications 2008: 9 publications 2009: 6 publications 2010: 9 publications 2011: 23 publications 2012: 6 publications 2013: 2 publications 2014: 16 publications 2015: 9 publications 2016: 4 publications 2017: 9 publications 2018: 11 publications 2019: 21 publications 2020: 11 publications 2021: 8 publications 2022: 25 publications 2023: 46 publications 2024: 29 publications 2025: 9 publications
1984 2025

339 publications in total across all disciplines

View publications per year as a table
Hiroshi Naraoka: publications per year, 1984 to 2025
Year Publications
1984 1
1985 0
1986 3
1987 2
1988 1
1989 2
1990 2
1991 2
1992 0
1993 2
1994 2
1995 2
1996 1
1997 5
1998 1
1999 4
2000 8
2001 3
2002 4
2003 9
2004 8
2005 10
2006 7
2007 7
2008 9
2009 6
2010 9
2011 23
2012 6
2013 2
2014 16
2015 9
2016 4
2017 9
2018 11
2019 21
2020 11
2021 8
2022 25
2023 46
2024 29
2025 9
Total 339
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Hiroshi Naraoka publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Hiroshi Naraoka sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 66 bars. Horizontal axis: publications, 41–50 to 690+. Vertical axis: number of scientists, 0 to 617. Most scientists, 617, have 121–130 publications. The last bar groups every scientist with 690 publications or more. The highlighted bar, 301–310 publications, is where this scientist sits. 41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 282 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–689 publications: 4 scientists 690+ publications: 100 scientists
41–50 publications 690+

This scientist: 307 publications — 87th percentile

87% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 690 publications or more.

View publications distribution as a table
Number of Environmental Sciences scientists by publication count, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
Publications Scientists This scientist
41–50 21
51–60 62
61–70 133
71–80 257
81–90 361
91–100 440
101–110 492
111–120 541
121–130 617
131–140 544
141–150 541
151–160 539
161–170 444
171–180 444
181–190 400
191–200 377
201–210 318
211–220 282
221–230 263
231–240 220
241–250 217
251–260 180
261–270 181
271–280 155
281–290 130
291–300 127
301–310 130 307
311–320 85
321–330 106
331–340 80
341–350 83
351–360 75
361–370 69
371–380 52
381–390 54
391–400 56
401–410 44
411–420 40
421–430 36
431–440 25
441–450 25
451–460 32
461–470 29
471–480 21
481–490 26
491–500 26
501–510 17
511–520 19
521–530 15
531–540 22
541–550 12
551–560 15
561–570 11
571–580 19
581–590 9
591–600 9
601–610 7
611–620 11
621–630 5
631–640 5
641–650 6
651–660 3
661–670 3
671–680 4
681–689 4
690+ 100
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Hiroshi Naraoka D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Hiroshi Naraoka sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 97 bars. Horizontal axis: D-Index, 30 to 126+. Vertical axis: number of scientists, 0 to 348. Most scientists, 348, have 45 D-Index. The last bar groups every scientist with 126 D-Index or more. The highlighted bar, 47 D-Index, is where this scientist sits. 30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 198 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 20 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125 D-Index: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

This scientist: 47 D-Index — 42nd percentile

42% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 126 D-Index or more.

View D-Index distribution as a table
Number of Environmental Sciences scientists by D-index, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
D-Index Scientists This scientist
30 12
31 26
32 51
33 88
34 123
35 163
36 206
37 267
38 265
39 275
40 321
41 343
42 305
43 336
44 330
45 348
46 291
47 275 47
48 272
49 273
50 263
51 232
52 266
53 217
54 198
55 177
56 202
57 204
58 166
59 177
60 166
61 152
62 143
63 150
64 124
65 119
66 120
67 118
68 82
69 98
70 94
71 105
72 74
73 84
74 70
75 67
76 78
77 60
78 59
79 52
80 47
81 38
82 48
83 42
84 42
85 43
86 29
87 37
88 29
89 30
90 34
91 20
92 22
93 17
94 19
95 24
96 21
97 20
98 24
99 17
100 17
101 21
102 25
103 18
104 26
105 20
106 15
107 10
108 13
109 15
110 12
111 8
112 7
113 9
114 6
115 12
116 7
117 8
118 3
119 5
120 7
121 2
122 4
123 8
124 7
125 9
126+ 92
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Overview

Hiroshi Naraoka is affiliated with Kyushu University in Japan and focuses their research on several areas within physics, astronomy, and earth sciences. Their work primarily spans the fields of Physics and Astronomy, Earth and Planetary Sciences, and Environmental Science.

The researcher's main fields of study include:

  • Physics and Astronomy
  • Earth and Planetary Sciences
  • Environmental Science

Within these broader disciplines, Naraoka explores various subfields such as:

  • Astronomy and Astrophysics
  • Ecology
  • Geophysics
  • Spectroscopy
  • Atmospheric Science

Their research topics cover multiple aspects of planetary and environmental sciences, including:

  • Astro and Planetary Science
  • Planetary Science and Exploration
  • Isotope Analysis in Ecology
  • Geological and Geochemical Analysis
  • Mass Spectrometry Techniques and Applications
  • High-pressure geophysics and materials
  • Geology and Paleoclimatology Research

Hiroshi Naraoka has published numerous papers in leading scientific journals. Some recent representative publications are:

  • Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu, 2023, Science
  • Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites, 2022, Science
  • Pebbles and sand on asteroid (162173) Ryugu: In situ observation and particles returned to Earth, 2022, Science
  • Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu, 2021, Nature Astronomy
  • Identifying the wide diversity of extraterrestrial purine and pyrimidine nucleobases in carbonaceous meteorites, 2022, Nature Communications

These publications reflect ongoing research related to asteroid Ryugu and carbonaceous meteorites, indicating a focus on the molecular and mineralogical analysis of extraterrestrial materials.

Their frequent coauthors include:

  • Shogo Tachibana
  • Kanako Sakamoto
  • Tomoki Nakamura
  • Ryuji Okazaki
  • T. Noguchi

Hiroshi Naraoka's works are often published in influential venues, especially those dedicated to planetary sciences and related fields. Prominent publication venues include:

  • Meteoritics and Planetary Science
  • Nature Communications
  • Science Advances
  • Geochimica et Cosmochimica Acta
  • Earth Planets and Space

Best Publications

  • Compound-specific δD–δ13C analyses of n-alkanes extracted from terrestrial and aquatic plants

    Yoshito Chikaraishi;Hiroshi Naraoka

  • Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites

    Unknown

  • Three-Dimensional Structure of Hayabusa Samples: Origin and Evolution of Itokawa Regolith

    Akira Tsuchiyama;Masayuki Uesugi;Takashi Matsushima;Tatsuhiro Michikami

  • Hydrogen and carbon isotopic fractionations of lipid biosynthesis among terrestrial (C3, C4 and CAM) and aquatic plants

    Yoshito Chikaraishi;Hiroshi Naraoka;Simon R. Poulson

  • Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu

    Unknown

  • δ13C and δD relationships among three n-alkyl compound classes (n-alkanoic acid, n-alkane and n-alkanol) of terrestrial higher plants

    Yoshito Chikaraishi;Hiroshi Naraoka

  • Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission.

    Hisayoshi Yurimoto;Ken Ichi Abe;Masanao Abe;Mitsuru Ebihara

  • Irradiation History of Itokawa Regolith Material Deduced from Noble Gases in the Hayabusa Samples

    Keisuke Nagao;Ryuji Okazaki;Tomoki Nakamura;Yayoi N. Miura

  • Carbon and hydrogen isotopic fractionation during lipid biosynthesis in a higher plant (Cryptomeria japonica).

    Yoshito Chikaraishi;Hiroshi Naraoka;Simon R. Poulson

  • A new family of extraterrestrial amino acids in the Murchison meteorite.

    Toshiki Koga;Hiroshi Naraoka

  • Source identification of Malaysian atmospheric polycyclic aromatic hydrocarbons nearby forest fires using molecular and isotopic compositions

    Tomoaki Okuda;Hidetoshi Kumata;Mohamad Pauzi Zakaria;Hiroshi Naraoka

  • Molecular-isotopic stratigraphy of long-chain n-alkanes in Lake Baikal Holocene and glacial age sediments

    David Brincat;Keita Yamada;Ryoshi Ishiwatari;Hitoshi Uemura

  • Carbon and hydrogen isotope variation of plant biomarkers in a plant-soil system

    Yoshito Chikaraishi;Hiroshi Naraoka

  • Macromolecular organic matter in samples of the asteroid (162173) Ryugu

    Unknown

  • Carbon, nitrogen, and sulfur geochemistry of Archean and Proterozoic shales from the Kaapvaal Craton, South Africa

    Yumiko Watanabe;Hiroshi Naraoka;Hiroshi Naraoka;David J. Wronkiewicz;Kent C. Condie

  • A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

    Unknown

  • Origin of atmospheric polycyclic aromatic hydrocarbons (PAHs) in Chinese cities solved by compound-specific stable carbon isotopic analyses

    Tomoaki Okuda;Hidetoshi Kumata;Hiroshi Naraoka;Hideshige Takada

  • Isotopic evidence from an Antarctic carbonaceous chondrite for two reaction pathways of extraterrestrial PAH formation

    Hiroshi Naraoka;Akira Shimoyama;Kaoru Harada

  • Nucleobase synthesis in interstellar ices

    Yasuhiro Oba;Yoshinori Takano;Hiroshi Naraoka;Naoki Watanabe

  • Molecular distribution of monocarboxylic acids in Asuka carbonaceous chondrites from Antarctica.

    Hiroshi Naraoka;Akira Shimoyama;Kaoru Harada

  • Chemical and biological evolution of early Earth: Constraints from banded iron formations

    Hiroshi Ohmoto;Yumiko Watanabe;Kosei E. Yamaguchi;Hiroshi Naraoka

  • Geochemical and organic carbon isotope studies across the continental Permo-Triassic boundary of Raniganj Basin, eastern India

    A. Sarkar;H. Yoshioka;H. Yoshioka;M. Ebihara;H. Naraoka

  • Hydrogen isotopic fractionations during desaturation and elongation associated with polyunsaturated fatty acid biosynthesis in marine macroalgae.

    Yoshito Chikaraishi;Yaeko Suzuki;Hiroshi Naraoka

  • Molecular and isotopic abundances of long-chain n-fatty acids in open marine sediments of the western North Pacific

    Hiroshi Naraoka;Ryoshi Ishiwatari

  • δ13C and δD identification of sources of lipid biomarkers in sediments of Lake Haruna (Japan)

    Yoshito Chikaraishi;Hiroshi Naraoka

Frequent Co-Authors

Akira Tsuchiyama
Akira Tsuchiyama Ritsumeikan University
Takaaki Noguchi
Takaaki Noguchi Kyoto University
Mitsuru Ebihara
Mitsuru Ebihara Tokyo Metropolitan University
Tomoki Nakamura
Tomoki Nakamura Tohoku University
Keisuke Nagao
Keisuke Nagao University of Tokyo
Hisayoshi Yurimoto
Hisayoshi Yurimoto Hokkaido University
Ryoshi Ishiwatari
Ryoshi Ishiwatari Tokyo Metropolitan University
Minoru Ikehara
Minoru Ikehara Kōchi University
Toshifumi Mukai
Toshifumi Mukai Japan Aerospace Exploration Agency
Trevor Ireland
Trevor Ireland University of Queensland

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