World's Best Scientists 2026 revealed!
Kay I. Ohshima

Kay I. Ohshima

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 44 4711 4336 118 109 222 7399

Kay I. Ohshima publications per year

The chart shows the history of publications by Kay I. Ohshima between 1990 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kay I. Ohshima published across 36 years, from 1990 to 2025, averaging 6.9 papers a year. Output peaked at 18 publications in 2016. 16 of the 248 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1990 to 2025. Vertical axis: number of publications, 0 to 18. Peak 18 publications in 2016. 1990: 2 publications 1991: 0 publications 1992: 2 publications 1993: 3 publications 1994: 5 publications 1995: 2 publications 1996: 2 publications 1997: 6 publications 1998: 1 publication 1999: 2 publications 2000: 4 publications 2001: 3 publications 2002: 3 publications 2003: 5 publications 2004: 6 publications 2005: 8 publications 2006: 8 publications 2007: 8 publications 2008: 7 publications 2009: 6 publications 2010: 7 publications 2011: 7 publications 2012: 6 publications 2013: 7 publications 2014: 15 publications 2015: 15 publications 2016: 18 publications 2017: 15 publications 2018: 5 publications 2019: 18 publications 2020: 12 publications 2021: 8 publications 2022: 5 publications 2023: 11 publications 2024: 9 publications 2025: 7 publications
1990 2025

248 publications in total across all disciplines

View publications per year as a table
Kay I. Ohshima: publications per year, 1990 to 2025
Year Publications
1990 2
1991 0
1992 2
1993 3
1994 5
1995 2
1996 2
1997 6
1998 1
1999 2
2000 4
2001 3
2002 3
2003 5
2004 6
2005 8
2006 8
2007 8
2008 7
2009 6
2010 7
2011 7
2012 6
2013 7
2014 15
2015 15
2016 18
2017 15
2018 5
2019 18
2020 12
2021 8
2022 5
2023 11
2024 9
2025 7
Total 248
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Kay I. Ohshima publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Kay I. Ohshima sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 218–227 publications, is where this scientist sits. 38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38–47 publications 603+

This scientist: 222 publications — 70th percentile

70% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401
198–207 333
208–217 292
218–227 290 222
228–237 262
238–247 243
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
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Kay I. Ohshima D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Kay I. Ohshima sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 44 D-Index, is where this scientist sits. 30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 44 D-Index — 50th percentile

50% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277
43 279
44 248 44
45 257
46 212
47 202
48 207
49 204
50 183
51 178
52 182
53 178
54 163
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
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Overview

Kay I. Ohshima is affiliated with Hokkaido University in Japan. Their research expertise primarily lies within the field of Earth and Planetary Sciences, with specific contributions spanning Atmospheric Science, Oceanography, Environmental Chemistry, Global and Planetary Change, and Geology.

The scientist's work addresses key topics such as Arctic and Antarctic ice dynamics, cryospheric studies and observations, oceanographic and atmospheric processes, methane hydrates and related phenomena, climate change and permafrost, geology and paleoclimatology research, as well as marine and coastal ecosystems.

Recent publications by Kay I. Ohshima include:

  • Mapping of Active Frazil for Antarctic Coastal Polynyas, With an Estimation of Sea-Ice Production (2021, Geophysical Research Letters)
  • High-resolution mapping of circum-Antarctic landfast sea ice distribution, 2000-2018 (2020, Earth System Science Data)
  • Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability (2021, The Cryosphere)
  • Strong ice-ocean interaction beneath Shirase Glacier Tongue in East Antarctica (2020, Nature Communications)
  • Observing Antarctic Bottom Water in the Southern Ocean (2023, Frontiers in Marine Science)

The scientist frequently collaborates with other researchers. Their notable coauthors include:

  • Takeshi Tamura (9 joint publications)
  • Kazuki Nakata (8 joint publications)
  • Vigan Mensah (8 joint publications)
  • Yasushi Fukamachi (8 joint publications)
  • Masato Ito (7 joint publications)

Kay I. Ohshima has published extensively in several scientific journals, with frequent contributions to:

  • Journal of Oceanography (6 publications)
  • Journal of Geophysical Research Oceans (5 publications)
  • Progress In Oceanography (4 publications)
  • Journal of Atmospheric and Oceanic Technology (3 publications)
  • Geophysical Research Letters (2 publications)

Best Publications

  • Mapping of sea ice production for Antarctic coastal polynyas

    Takeshi Tamura;Kay I. Ohshima;Sohey Nihashi

  • Antarctic Bottom Water production by intense sea-ice formation in the Cape Darnley polynya

    Kay I. Ohshima;Yasushi Fukamachi;Guy D. Williams;Sohey Nihashi

  • Circumpolar Mapping of Antarctic Coastal Polynyas and Landfast Sea Ice: Relationship and Variability

    Sohey Nihashi;Kay I. Ohshima

  • The suppression of Antarctic bottom water formation by melting ice shelves in Prydz Bay

    G. D. Williams;L. Herraiz-Borreguero;Fabien Roquet;T. Tamura

  • Near-surface circulation and tidal currents of the Okhotsk Sea observed with satellite-tracked drifters

    Kay I. Ohshima;Masaaki Wakatsuchi;Yasushi Fukamachi;Genta Mizuta

  • Distribution and formation of Okhotsk Sea Intermediate Water: An analysis of isopycnal climatological data

    Motoyo Itoh;Kay I. Ohshima;Masaaki Wakatsuchi

  • Sea ice production variability in Antarctic coastal polynyas

    Takeshi Tamura;Takeshi Tamura;Kay I. Ohshima;Alexander D. Fraser;Alexander D. Fraser;Guy D. Williams

  • Mapping of sea ice production in the Arctic coastal polynyas

    Takeshi Tamura;Takeshi Tamura;Kay I. Ohshima

  • The flow system in the Japan Sea caused by a sea level difference through shallow straits

    Kay I. Ohshima

  • Warming and oxygen decrease of intermediate water in the northwestern North Pacific, originating from the Sea of Okhotsk, 1955–2004

    Takuya Nakanowatari;Kay I. Ohshima;Masaaki Wakatsuchi

  • Estimation of Thin Ice Thickness and Detection of Fast Ice from SSM/I Data in the Antarctic Ocean

    Takeshi Tamura;Kay I. Ohshima;Thorsten Markus;Donald J. Cavalieri

  • Global view of sea-ice production in polynyas and its linkage to dense/bottom water formation

    Kay I. Ohshima;Sohey Nihashi;Katsushi Iwamoto

  • Structure and Seasonal Variability of the East Sakhalin Current

    Genta Mizuta;Yasushi Fukamachi;Kay I. Ohshima;Masaaki Wakatsuchi

  • Evidence for ice-ocean albedo feedback in the Arctic Ocean shifting to a seasonal ice zone

    Haruhiko Kashiwase;Haruhiko Kashiwase;Kay I. Ohshima;Sohey Nihashi;Hajo Eicken

  • Thickness and production of sea ice in the Okhotsk Sea coastal polynyas from AMSR‐E

    Sohey Nihashi;Kay I. Ohshima;Takeshi Tamura;Yasushi Fukamachi

  • Potential regime shift in decreased sea ice production after the Mertz Glacier calving.

    T. Tamura;T. Tamura;G. D. Williams;A. D. Fraser;K. I. Ohshima

  • Physical, structural, and isotopic characteristics and growth processes of fast sea ice in Lützow‐Holm Bay, Antarctica

    T. Kawamura;K. I. Ohshima;T. Takizawa;S. Ushio

  • Seasonal Variations of Water Masses and Sea Level in the Southwestern Part of the Okhotsk Sea

    Motoyo Itoh;Kay I. Ohshima

  • Seasonal variations of the Antarctic coastal ocean in the vicinity of Lützow-Holm Bay

    Kay I. Ohshima;Takatoshi Takizawa;Shuki Ushio;Toshiyuki Kawamura

  • Improved mapping of sea ice production in the Arctic Ocean using AMSR‐E thin ice thickness algorithm

    Katsushi Iwamoto;Kay I. Ohshima;Takeshi Tamura;Takeshi Tamura

Frequent Co-Authors

Takeshi Tamura
Takeshi Tamura National Institute of Polar Research
Masaaki Wakatsuchi
Masaaki Wakatsuchi Hokkaido University
Hajo Eicken
Hajo Eicken Alfred Wegener Institute for Polar and Marine Research
Guy D. Williams
Guy D. Williams University of Tasmania
Robert A. Massom
Robert A. Massom Australian Antarctic Division
Stephen C. Riser
Stephen C. Riser University of Washington
Sascha Willmes
Sascha Willmes University of Trier
Hiroyasu Hasumi
Hiroyasu Hasumi University of Tokyo
Fabien Roquet
Fabien Roquet University of Gothenburg
Mark A. Hindell
Mark A. Hindell University of Tasmania

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