World Scientist and University Rankings 2025
Japan Engineering & Technology 233 Scientists Subject Rankings - 2025
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Jan 30, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (873.690) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
Climate Dynamics
Physical Oceanography
Dynamic Meteorology
Geophysical Fluid Dynamics
Metrics
H-Index
i10 Index
Citation Counts
102
252
44,924
* Total H IndexRankings
Ranking Based On Selection: 2
Molecular Evolutionary Biology
Molecular Marine Biology
Molecular Phylogenetics
Evolutionary Genomics
Fish Population Genetics
Metrics
H-Index
i10 Index
Citation Counts
84
287
23,522
* Total H IndexRankings
Ranking Based On Selection: 3
Capacitive Deionization
Environmental Chemistry
Materials Space-tectonics
Flow Chemistry
Metrics
H-Index
i10 Index
Citation Counts
79
163
15,870
* Total H IndexRankings
Ranking Based On Selection: 4
Climate Change
Coral Reef Fish
Plasticity
Adaptation
Genomics
Metrics
H-Index
i10 Index
Citation Counts
62
137
30,544
* Total H IndexRankings
Ranking Based On Selection: 5
Marine Geophysics
Seismic Imaging
Seismology
Metrics
H-Index
i10 Index
Citation Counts
61
194
12,381
* Total H IndexRankings
Ranking Based On Selection: 6
Ocean and Climate Dynamics
Metrics
H-Index
i10 Index
Citation Counts
60
155
17,958
* Total H IndexRankings
Ranking Based On Selection: 7
groundwater hydrology
sustainability
Land-ocean interaction
subsurface warming
water-energy-food nexus
Metrics
H-Index
i10 Index
Citation Counts
59
167
17,522
* Total H IndexRankings
Ranking Based On Selection: 8
Oceanography
Paleoceanography
Micropaleontology
Climate Change
Metrics
H-Index
i10 Index
Citation Counts
55
224
12,342
* Total H IndexRankings
Ranking Based On Selection: 9
coastal engineering
ocean engineering
computational fluid dynamics
particle methods
SPH
Metrics
H-Index
i10 Index
Citation Counts
51
105
9,807
* Total H IndexRankings
Ranking Based On Selection: 10
Oceanography
Metrics
H-Index
i10 Index
Citation Counts
51
202
12,860
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* Total H IndexRankings
Ranking Based On Selection: 11
Atmospheric Chemistry
Marine Chemistry
Air Pollution
Geochemistry
Metrics
H-Index
i10 Index
Citation Counts
50
137
8,974
* Total H IndexRankings
Ranking Based On Selection: 12
Marine Natural Products
Natural Product Chemistry
Metrics
H-Index
i10 Index
Citation Counts
44
86
4,972
* Total H IndexRankings
Ranking Based On Selection: 13
oceanography geochemistry
Metrics
H-Index
i10 Index
Citation Counts
42
131
8,333
* Total H IndexRankings
Ranking Based On Selection: 14
Marine Biology
Metrics
H-Index
i10 Index
Citation Counts
42
100
8,633
* Total H IndexRankings
Ranking Based On Selection: 15
Physical Geography
Coral Reefs
Coastal Geomorphology
Remote Sensing
Metrics
H-Index
i10 Index
Citation Counts
41
115
6,803
* Total H IndexRankings
Ranking Based On Selection: 16
climate variability and change
atmosphere-ocean interaction
Metrics
H-Index
i10 Index
Citation Counts
40
76
9,886
* Total H IndexRankings
Ranking Based On Selection: 17
Marine Biodiversity
Deep-sea Biology
Marine Plastics
Metrics
H-Index
i10 Index
Citation Counts
40
133
5,600
* Total H IndexRankings
Ranking Based On Selection: 18
Coastal Disaster
Coastal Engineering
Storm Surge
Green Infrastructure
Mangrove
Metrics
H-Index
i10 Index
Citation Counts
38
91
4,444
* Total H IndexRankings
Ranking Based On Selection: 19
Physical Oceanography
Metrics
H-Index
i10 Index
Citation Counts
38
101
4,969
* Total H IndexRankings
Ranking Based On Selection: 20
coastal engineering
ocean engineering
coastal disaster
waves
tsunami
Metrics
H-Index
i10 Index
Citation Counts
38
91
5,715
* Total H IndexRankings
Ranking Based On Selection: 21
Oceanography
Metrics
H-Index
i10 Index
Citation Counts
37
78
5,057
* Total H IndexRankings
Ranking Based On Selection: 22
Physical Oceanography
Marine Ecosystem
Mixing
Plankton
Metrics
H-Index
i10 Index
Citation Counts
37
83
4,164
* Total H IndexRankings
Ranking Based On Selection: 23
ship stability
ship dynamics
Metrics
H-Index
i10 Index
Citation Counts
36
109
4,077
* Total H IndexRankings
Ranking Based On Selection: 24
Offshore Structures
Metrics
H-Index
i10 Index
Citation Counts
34
73
3,951
* Total H IndexRankings
Ranking Based On Selection: 25
coral biology
marine ecology
mesophotic corals
symbiosis
larval ecology
Metrics
H-Index
i10 Index
Citation Counts
33
62
3,596
Toshio Yamagata; 山形俊男
Metrics
H-Index
i10-Index
Citation Counts
102
252
44,924
Climate Dynamics
Physical Oceanography
Dynamic Meteorology
Geophysical Fluid Dynamics
Mutsumi Nishida
University of Tokyo
Tokyo, Japan
Metrics
H-Index
i10-Index
Citation Counts
84
287
23,522
Molecular Evolutionary Biology
Molecular Marine Biology
Molecular Phylogenetics
Evolutionary Genomics
Fish Population Genetics
Xingtao Xu|Xing-Tao Xu
Metrics
H-Index
i10-Index
Citation Counts
79
163
15,870
Capacitive Deionization
Environmental Chemistry
Materials Space-tectonics
Flow Chemistry
Timothy Ravasi
Metrics
H-Index
i10-Index
Citation Counts
62
137
30,544
Climate Change
Coral Reef Fish
Plasticity
Adaptation
Genomics
Shuichi Kodaira
Metrics
H-Index
i10-Index
Citation Counts
61
194
12,381
Marine Geophysics
Seismic Imaging
Seismology
Makoto Taniguchi
Metrics
H-Index
i10-Index
Citation Counts
59
167
17,522
groundwater hydrology
sustainability
Land-ocean interaction
subsurface warming
water-energy-food nexus
Kozo Takahashi
Hokusei Gakuen University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
55
224
12,342
Oceanography
Paleoceanography
Micropaleontology
Climate Change
coastal engineering
ocean engineering
computational fluid dynamics
particle methods
SPH
Yutaka W Watanabe
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
51
202
12,860
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Hiroshi Tanimoto
Metrics
H-Index
i10-Index
Citation Counts
50
137
8,974
Atmospheric Chemistry
Marine Chemistry
Air Pollution
Geochemistry
Hiroshi Nagai 永井宏史
Metrics
H-Index
i10-Index
Citation Counts
44
86
4,972
Marine Natural Products
Natural Product Chemistry
Jun Nishioka
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
42
131
8,333
oceanography geochemistry
Yoshihisa Shirayama 白山 義久
Metrics
H-Index
i10-Index
Citation Counts
42
100
8,633
Hiroya Yamano
Metrics
H-Index
i10-Index
Citation Counts
41
115
6,803
Physical Geography
Coral Reefs
Coastal Geomorphology
Remote Sensing
Shoshiro Minobe
Hokkaido University
Sapporo, Japan
Metrics
H-Index
i10-Index
Citation Counts
40
76
9,886
climate variability and change
atmosphere-ocean interaction
Fujikura, Kastsunori
Metrics
H-Index
i10-Index
Citation Counts
40
133
5,600
Marine Biodiversity
Deep-sea Biology
Marine Plastics
Takagi Hiroshi
Metrics
H-Index
i10-Index
Citation Counts
38
91
4,444
Coastal Disaster
Coastal Engineering
Storm Surge
Green Infrastructure
Mangrove
Physical Oceanography
coastal engineering
ocean engineering
coastal disaster
waves
tsunami
Shigeto Nishino
Metrics
H-Index
i10-Index
Citation Counts
37
78
5,057
Hidekatsu Yamazaki
Metrics
H-Index
i10-Index
Citation Counts
37
83
4,164
Physical Oceanography
Marine Ecosystem
Mixing
Plankton
ship stability
ship dynamics
Tomoaki Utsunomiya
Kyushu University
Fukuoka, Japan
Metrics
H-Index
i10-Index
Citation Counts
34
73
3,951
coral biology
marine ecology
mesophotic corals
symbiosis
larval ecology