Subject Rankings
Engineering & Technology / Earth Sciences 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 Dec 30, 2024, 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 (874.427) 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
earth science
Metrics
H-Index
i10 Index
Citation Counts
150
359
116,700
* Total H IndexRankings
Ranking Based On Selection: 2
geochemistry
petrology
isotopic geochemistry
mantle evolution
Metrics
H-Index
i10 Index
Citation Counts
150
709
98,189
* Total H IndexRankings
Ranking Based On Selection: 3
evolution
genomics
population genetics
ancient DNA
environmental DNA
Metrics
H-Index
i10 Index
Citation Counts
147
316
75,693
* Total H IndexRankings
Ranking Based On Selection: 4
aerosols
air quality
geosciences
environmental geochemistry
Metrics
H-Index
i10 Index
Citation Counts
143
716
77,837
* Total H IndexRankings
Ranking Based On Selection: 5
Biogeochemistry of phosphorus
sulphur and trace elements in soil-plant systems
Metrics
H-Index
i10 Index
Citation Counts
143
418
77,031
* Total H IndexRankings
Ranking Based On Selection: 6
Remote Sensing
Climate
Biogeosciences
Geosciences
Ecology
Metrics
H-Index
i10 Index
Citation Counts
140
341
88,413
* Total H IndexRankings
Ranking Based On Selection: 7
geology
volcanology
Metrics
H-Index
i10 Index
Citation Counts
139
437
62,171
* Total H IndexRankings
Ranking Based On Selection: 8
environmental microbiology
bioluminescence
geobiology
Metrics
H-Index
i10 Index
Citation Counts
138
433
80,306
* Total H IndexRankings
Ranking Based On Selection: 9
Earth and Environmental Sciences [Univ. of Adelaide]
Metrics
H-Index
i10 Index
Citation Counts
137
1,164
86,173
* Total H IndexRankings
Ranking Based On Selection: 10
planet imaging
stellar astrophysics
interstellar medium
Metrics
H-Index
i10 Index
Citation Counts
136
381
129,532
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* Total H IndexRankings
Ranking Based On Selection: 11
Geology
Geochemistry
Metrics
H-Index
i10 Index
Citation Counts
136
350
60,104
* Total H IndexRankings
Ranking Based On Selection: 12
Environmental Geography
Metrics
H-Index
i10 Index
Citation Counts
132
1,576
173,489
* Total H IndexRankings
Ranking Based On Selection: 13
Earth System science
biogeochemical cycles
extreme events
eco-hydrology
machine learning
Metrics
H-Index
i10 Index
Citation Counts
132
322
89,785
* Total H IndexRankings
Ranking Based On Selection: 14
atmospheric chemistry
emissions
satellite remote sensing
air quality
Metrics
H-Index
i10 Index
Citation Counts
131
363
67,575
* Total H IndexRankings
Ranking Based On Selection: 15
Petrology
Geochemistry
Tectonics
Geodynamics
Geophysics
Metrics
H-Index
i10 Index
Citation Counts
127
481
67,328
* Total H IndexRankings
Ranking Based On Selection: 16
Crustal evolution
geochronology
Precambrian tectonics
palaeomagnetism
Metrics
H-Index
i10 Index
Citation Counts
125
418
53,648
* Total H IndexRankings
Ranking Based On Selection: 17
land surface processes
climate
Metrics
H-Index
i10 Index
Citation Counts
125
358
65,386
* Total H IndexRankings
Ranking Based On Selection: 18
Geochemistry
Geology
Early Earth
SIMS
Metrics
H-Index
i10 Index
Citation Counts
122
280
70,105
* Total H IndexRankings
Ranking Based On Selection: 19
Biogeochemistry
Organic Geochemistry
Oceanography
Stable Isotopes
Geochemistry
Metrics
H-Index
i10 Index
Citation Counts
121
372
59,511
* Total H IndexRankings
Ranking Based On Selection: 20
Surface/Interface Chemistry
Envronmental Chemistry/Geochemistry
Nanomaterials
Metrics
H-Index
i10 Index
Citation Counts
121
390
47,307
* Total H IndexRankings
Ranking Based On Selection: 21
Metrics
H-Index
i10 Index
Citation Counts
120
243
114,465
* Total H IndexRankings
Ranking Based On Selection: 22
oxygen
evolution
oceanography
geobiology
biogeochemistry
Metrics
H-Index
i10 Index
Citation Counts
119
252
63,113
* Total H IndexRankings
Ranking Based On Selection: 23
dendroclimatology
paleoclimatology
climatic change
Metrics
H-Index
i10 Index
Citation Counts
119
332
66,062
* Total H IndexRankings
Ranking Based On Selection: 24
oceanography
Metrics
H-Index
i10 Index
Citation Counts
119
258
70,774
* Total H IndexRankings
Ranking Based On Selection: 25
Earth and planetary science
Metrics
H-Index
i10 Index
Citation Counts
119
440
47,215
Steven Running
University of Montana, Missoula
St. Louis,, United States
Metrics
H-Index
i10-Index
Citation Counts
150
359
116,700
William L Griffin
Macquarie University
Sydney, Australia
Metrics
H-Index
i10-Index
Citation Counts
150
709
98,189
geochemistry
petrology
isotopic geochemistry
mantle evolution
Eske Willerslev
University of Copenhagen
Copenhagen, Denmark
Metrics
H-Index
i10-Index
Citation Counts
147
316
75,693
evolution
genomics
population genetics
ancient DNA
environmental DNA
Xavier Querol
Metrics
H-Index
i10-Index
Citation Counts
143
716
77,837
aerosols
air quality
geosciences
environmental geochemistry
Steve Mcgrath
Rothamsted Research
Harpenden, United Kingdom
Metrics
H-Index
i10-Index
Citation Counts
143
418
77,031
Biogeochemistry of phosphorus
sulphur and trace elements in soil-plant systems
Ranga Myneni
Boston University
Boston, United States
Metrics
H-Index
i10-Index
Citation Counts
140
341
88,413
Remote Sensing
Climate
Biogeosciences
Geosciences
Ecology
Stephen Sparks
University of Bristol
Bristol, United Kingdom
Metrics
H-Index
i10-Index
Citation Counts
139
437
62,171
Kenneth H Nealson
University of Southern California
Los Angeles, United States
Metrics
H-Index
i10-Index
Citation Counts
138
433
80,306
environmental microbiology
bioluminescence
geobiology
M Santosh
Metrics
H-Index
i10-Index
Citation Counts
137
1,164
86,173
Earth and Environmental Sciences [Univ. of Adelaide]
Gillian Knapp
Princeton University
Princeton, United States
Metrics
H-Index
i10-Index
Citation Counts
136
381
129,532
planet imaging
stellar astrophysics
interstellar medium
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CJ Hawkesworth
University of Bristol
Bristol, United Kingdom
Metrics
H-Index
i10-Index
Citation Counts
136
350
60,104
Min Liu
East China Normal University
Shanghai, China
Metrics
H-Index
i10-Index
Citation Counts
132
1,576
173,489
Markus Reichstein
Metrics
H-Index
i10-Index
Citation Counts
132
322
89,785
Earth System science
biogeochemical cycles
extreme events
eco-hydrology
machine learning
Qiang Zhang
Tsinghua University
Beijing, China
Metrics
H-Index
i10-Index
Citation Counts
131
363
67,575
atmospheric chemistry
emissions
satellite remote sensing
air quality
Suzanne Yvette O Reilly
Macquarie University
Sydney, Australia
Metrics
H-Index
i10-Index
Citation Counts
127
481
67,328
Petrology
Geochemistry
Tectonics
Geodynamics
Geophysics
Alfred Kröner
Helmholtz Institut Mainz
Mainz, Germany
Metrics
H-Index
i10-Index
Citation Counts
125
418
53,648
Crustal evolution
geochronology
Precambrian tectonics
palaeomagnetism
Robert Dickinson
Metrics
H-Index
i10-Index
Citation Counts
125
358
65,386
land surface processes
climate
T Mark Harrison
University of California Los Angeles
Los Angeles, United States
Metrics
H-Index
i10-Index
Citation Counts
122
280
70,105
Geochemistry
Geology
Early Earth
SIMS
Jack J Middelburg
Utrecht University
Utrecht, Netherlands
Metrics
H-Index
i10-Index
Citation Counts
121
372
59,511
Biogeochemistry
Organic Geochemistry
Oceanography
Stable Isotopes
Geochemistry
Gordon E Brown Jr
Stanford University
Stanford, United States
Metrics
H-Index
i10-Index
Citation Counts
121
390
47,307
Surface/Interface Chemistry
Envronmental Chemistry/Geochemistry
Nanomaterials
Fabrice Matichard
Metrics
H-Index
i10-Index
Citation Counts
120
243
114,465
Donald E Canfield
University of Southern Denmark
Tianjin, Denmark
Metrics
H-Index
i10-Index
Citation Counts
119
252
63,113
oxygen
evolution
oceanography
geobiology
biogeochemistry
Edward Cook
Columbia University New York
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
119
332
66,062
dendroclimatology
paleoclimatology
climatic change
Jorge L Sarmiento
Princeton University
Princeton, United States
Metrics
H-Index
i10-Index
Citation Counts
119
258
70,774
Sean C Solomon
Columbia University New York
New York, United States
Metrics
H-Index
i10-Index
Citation Counts
119
440
47,215