World's Best Scientists 2026 revealed!
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Earth Science
USA
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 93 213 182 109 92 571 35227

Roger N. Clark publications per year

The chart shows the history of publications by Roger N. Clark between 1971 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Roger N. Clark published across 55 years, from 1971 to 2025, averaging 13.9 papers a year. Output peaked at 61 publications in 2010. 29 of the 763 publications appeared in the last two years.

No. of publications
20 40 60
Bar chart. Horizontal axis: year, 1971 to 2025. Vertical axis: number of publications, 0 to 61. Peak 61 publications in 2010. 1971: 2 publications 1972: 1 publication 1973: 1 publication 1974: 2 publications 1975: 1 publication 1976: 0 publications 1977: 1 publication 1978: 2 publications 1979: 4 publications 1980: 7 publications 1981: 6 publications 1982: 5 publications 1983: 6 publications 1984: 5 publications 1985: 6 publications 1986: 2 publications 1987: 3 publications 1988: 4 publications 1989: 4 publications 1990: 7 publications 1991: 4 publications 1992: 6 publications 1993: 8 publications 1994: 2 publications 1995: 7 publications 1996: 5 publications 1997: 3 publications 1998: 6 publications 1999: 6 publications 2000: 7 publications 2001: 11 publications 2002: 12 publications 2003: 10 publications 2004: 13 publications 2005: 15 publications 2006: 41 publications 2007: 45 publications 2008: 53 publications 2009: 49 publications 2010: 61 publications 2011: 45 publications 2012: 48 publications 2013: 34 publications 2014: 22 publications 2015: 24 publications 2016: 21 publications 2017: 19 publications 2018: 23 publications 2019: 23 publications 2020: 9 publications 2021: 11 publications 2022: 6 publications 2023: 16 publications 2024: 21 publications 2025: 8 publications
1971 2025

763 publications in total across all disciplines

View publications per year as a table
Roger N. Clark: publications per year, 1971 to 2025
Year Publications
1971 2
1972 1
1973 1
1974 2
1975 1
1976 0
1977 1
1978 2
1979 4
1980 7
1981 6
1982 5
1983 6
1984 5
1985 6
1986 2
1987 3
1988 4
1989 4
1990 7
1991 4
1992 6
1993 8
1994 2
1995 7
1996 5
1997 3
1998 6
1999 6
2000 7
2001 11
2002 12
2003 10
2004 13
2005 15
2006 41
2007 45
2008 53
2009 49
2010 61
2011 45
2012 48
2013 34
2014 22
2015 24
2016 21
2017 19
2018 23
2019 23
2020 9
2021 11
2022 6
2023 16
2024 21
2025 8
Total 763
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Roger N. Clark publications per year - data summary

  • Roger N. Clark, a Earth Science scholar from Planetary Science Institute, has 763 publications recorded across 55 years, from 1971 to 2025.
  • The oldest publication on record dates to 1971 and the most recent to 2025.
  • The most productive year is 2010, with 61 publications.
  • The least productive years with any output are 1972, 1973, 1975 and 1977, with 1 publication each.
  • 1 of the 55 years in the span carries no publications at all (1976).
  • The rate of publication averages 13.9 papers per year over the whole span, or 14.1 per year counting only the 54 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 62 publications, 8% of the career total.
  • Split into equal eras - 1971-1989: 62 publications (3.3 per year); 1990-2008: 261 publications (13.7 per year); 2009-2025: 440 publications (25.9 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Roger N. Clark 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 Roger N. Clark 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, 568–577 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: 571 publications — 99th percentile

99% 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
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 7 571
578–587 14
588–597 5
598–602 4
603+ 100
Download as CSV

Roger N. Clark publication distribution in Earth Science in 2026 - data summary

  • The chart plots the publication count of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 58 ranges running from 38–47 to 603+ publications.
  • Roger N. Clark, a Earth Science scholar from Planetary Science Institute, records 571 publications - the 99th percentile of the discipline.
  • 99% of ranked Earth Science scientists score the same or lower than Roger N. Clark, and about 1% score higher.
  • The median of the discipline falls in the 168–177 publications range, and Roger N. Clark ranks above the median.
  • The most crowded range is 128–137 publications, holding 557 scientists (6% of the field).
  • 58% of the field sits in the lowest quarter of the value range (up to 178–187 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 603 publications or more, 100 scientists in all (1% of the field).

Roger N. Clark 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 Roger N. Clark 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, 93 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: 93 D-Index — 98th percentile

98% 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
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 93
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
Download as CSV

Roger N. Clark D-index placement in Earth Science in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 77 ranges running from 30 to 106+ D-Index.
  • Roger N. Clark, a Earth Science scholar from Planetary Science Institute, records 93 D-Index - the 98th percentile of the discipline.
  • 98% of ranked Earth Science scientists score the same or lower than Roger N. Clark, and about 2% score higher.
  • The median of the discipline falls in the 44 D-Index range, and Roger N. Clark ranks above the median.
  • The most crowded range is 36 D-Index, holding 389 scientists (4% of the field).
  • 62% of the field sits in the lowest quarter of the value range (up to 49 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 106 D-Index or more, 98 scientists in all (1% of the field).

Research.com Recognitions

  • 2026 - Research.com Earth Science in United States Leader Award
  • 2025 - Research.com Earth Science in United States Leader Award

Overview

Roger N. Clark is affiliated with the Planetary Science Institute in the United States. Their research primarily revolves around the field of Physics and Astronomy, with a particular concentration on Astronomy and Astrophysics. Their work also spans across subfields such as Ecology, Ecology, Evolution, Behavior and Systematics, Atmospheric Science, and Artificial Intelligence.

The main topics addressed in their research include:

  • Planetary Science and Exploration
  • Astro and Planetary Science
  • Geochemistry and Geologic Mapping
  • Isotope Analysis in Ecology
  • Aeolian processes and effects
  • Marine Biology and Ecology Research
  • Aquatic Invertebrate Ecology and Behavior

The frequent venues where Roger N. Clark has published their research include:

  • The Planetary Science Journal
  • The Festivus
  • Space Science Reviews
  • Zenodo (CERN European Organization for Nuclear Research)
  • Atmospheric chemistry and physics

Recent publications authored or co-authored by Roger N. Clark cover a range of topics related to remote sensing, planetary habitability, and molecular phylogeny. Selected papers include:

  • Quantifying uncertainty for remote spectroscopy of surface composition (2020) in Remote Sensing of Environment
  • On-orbit calibration and performance of the EMIT imaging spectrometer (2024) in Remote Sensing of Environment
  • Investigating Europa's Habitability with the Europa Clipper (2023) in Space Science Reviews
  • Molecular phylogeny and revised classification of the Buccinoidea (Neogastropoda) (2021) in Zoological Journal of the Linnean Society
  • The Mapping Imaging Spectrometer for Europa (MISE) (2024) in Space Science Reviews

Roger N. Clark collaborates frequently with a network of co-authors including Amanda Hendrix, Philip G. Brodrick, Carlos Pérez García-Pando, M. D. Dyar, and Gregg A. Swayze. These collaborations reflect a multidisciplinary approach across planetary science and related ecological and geological studies.

Best Publications

  • Reflectance spectroscopy: Quantitative analysis techniques for remote sensing applications

    Roger N. Clark;Ted L. Roush

  • High spectral resolution reflectance spectroscopy of minerals

    Roger N. Clark;Trude V. V. King;Matthew Klejwa;Gregg A. Swayze

  • USGS Digital Spectral Library splib06a

    Roger N. Clark;Gregg A. Swayze;Richard A. Wise;K. Eric Livo

  • Spectroscopic Determination of Leaf Biochemistry Using Band-Depth Analysis of Absorption Features and Stepwise Multiple Linear Regression

    Raymond F. Kokaly;Roger N. Clark

  • Imaging spectroscopy: Earth and planetary remote sensing with the USGS Tetracorder and expert systems

    Roger N. Clark;Gregg A. Swayze;K. Eric Livo;Raymond F. Kokaly

  • Character and Spatial Distribution of OH/H2O on the Surface of the Moon Seen by M3 on Chandrayaan-1

    C. M. Pieters;J. N. Goswami;J. N. Goswami;R. N. Clark;M. Annadurai

  • Hydrated silicate minerals on Mars observed by the Mars Reconnaissance Orbiter CRISM instrument

    John F. Mustard;Scott L. Murchie;S. M. Pelkey;B. L. Ehlmann

  • Orbital Identification of Carbonate-Bearing Rocks on Mars

    Bethany L. Ehlmann;John F. Mustard;Scott L. Murchie;Francois Poulet

  • The US Geological Survey, digital spectral reflectance library: version 1: 0.2 to 3.0 microns

    Roger N. Clark;Gregg A. Swayze;Trude V. V. King;Andrea J. Gallagher

  • Identification of hydrated silicate minerals on Mars using MRO‐CRISM: Geologic context near Nili Fossae and implications for aqueous alteration

    Bethany L. Ehlmann;John F. Mustard;Gregg A. Swayze;Roger N. Clark

  • USGS Spectral Library Version 7

    Raymond F. Kokaly;Roger N. Clark;Gregg A. Swayze;K. Eric Livo

  • A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter

    Scott L. Murchie;John F. Mustard;Bethany L. Ehlmann;Ralph E. Milliken

  • State of the art satellite and airborne marine oil spill remote sensing: Application to the BP Deepwater Horizon oil spill

    Ira Leifer;William J. Lehr;Debra Simecek-Beatty;Eliza Bradley

  • Detection of crystalline hematite mineralization on Mars by the Thermal Emission Spectrometer: Evidence for near‐surface water

    Philip Christensen;J. L. Bandfield;R. N. Clark;K. S. Edgett

  • Detection of Adsorbed Water and Hydroxyl on the Moon

    Roger N. Clark

  • Opaline silica in young deposits on Mars

    Ralph E. Milliken;Gregg A. Swayze;Raymond E. Arvidson;Janice L Bishop

  • Mapping vegetation in Yellowstone National Park using spectral feature analysis of AVIRIS data

    Raymond F Kokaly;Don G Despain;Roger N Clark;K.Eric Livo

  • Hydrogen Peroxide on the Surface of Europa

    R. W. Carlson;M. S. Anderson;R. E. Johnson;W. D. Smythe

  • Thermal emission spectrometer experiment: Mars Observer mission

    Philip R. Christensen;Donald L. Anderson;Stillman C. Chase;Roger N. Clark

  • Using Imaging Spectroscopy To Map Acidic Mine Waste

    G.A. Swayze;K.S. Smith;R. N. Clark;S. J. Sutley

Frequent Co-Authors

Robert H. Brown
Robert H. Brown University of Massachusetts Chan Medical School
Jason W. Barnes
Jason W. Barnes University of Idaho
Ralf Jaumann
Ralf Jaumann Freie Universität Berlin
Dale P. Cruikshank
Dale P. Cruikshank University of Central Florida
Christophe Sotin
Christophe Sotin Jet Propulsion Lab
Katrin Stephan
Katrin Stephan German Aerospace Center
S. Le Mouélic
S. Le Mouélic University of Nantes
Gregg A. Swayze
Gregg A. Swayze United States Geological Survey
P. Drossart
P. Drossart Université Paris Cité

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