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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 82 472 407 250 208 247 21315

Clark M. Johnson publications per year

The chart shows the history of publications by Clark M. Johnson between 1984 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Clark M. Johnson published across 42 years, from 1984 to 2025, averaging 6 papers a year. Output peaked at 14 publications in 2009. 2 of the 250 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1984 to 2025. Vertical axis: number of publications, 0 to 14. Peak 14 publications in 2009. 1984: 1 publication 1985: 0 publications 1986: 2 publications 1987: 0 publications 1988: 1 publication 1989: 2 publications 1990: 4 publications 1991: 3 publications 1992: 1 publication 1993: 3 publications 1994: 2 publications 1995: 8 publications 1996: 1 publication 1997: 9 publications 1998: 3 publications 1999: 5 publications 2000: 3 publications 2001: 2 publications 2002: 4 publications 2003: 8 publications 2004: 12 publications 2005: 12 publications 2006: 12 publications 2007: 7 publications 2008: 10 publications 2009: 14 publications 2010: 10 publications 2011: 10 publications 2012: 12 publications 2013: 10 publications 2014: 10 publications 2015: 14 publications 2016: 10 publications 2017: 13 publications 2018: 5 publications 2019: 4 publications 2020: 11 publications 2021: 6 publications 2022: 4 publications 2023: 0 publications 2024: 0 publications 2025: 2 publications
1984 2025

250 publications in total across all disciplines

View publications per year as a table
Clark M. Johnson: publications per year, 1984 to 2025
Year Publications
1984 1
1985 0
1986 2
1987 0
1988 1
1989 2
1990 4
1991 3
1992 1
1993 3
1994 2
1995 8
1996 1
1997 9
1998 3
1999 5
2000 3
2001 2
2002 4
2003 8
2004 12
2005 12
2006 12
2007 7
2008 10
2009 14
2010 10
2011 10
2012 12
2013 10
2014 10
2015 14
2016 10
2017 13
2018 5
2019 4
2020 11
2021 6
2022 4
2023 0
2024 0
2025 2
Total 250
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Clark M. Johnson 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 Clark M. Johnson 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, 238–247 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: 247 publications — 77th percentile

77% 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
238–247 243 247
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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Clark M. Johnson 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 Clark M. Johnson 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, 82 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: 82 D-Index — 95th percentile

95% 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 82
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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Research.com Recognitions

  • 1991 - IEEE Fellow For contributions to both the theory and application of photoelectrons, image conversion, and electron multiplication.

Overview

Clark M. Johnson is affiliated with the University of Wisconsin-Madison in the United States. Their research primarily focuses on the field of Earth and Planetary Sciences, with substantial contributions across various subfields and specialized topics.

The main fields of study associated with Clark M. Johnson include:

  • Earth and Planetary Sciences

Within this broad field, their work spans several subfields of study, such as:

  • Geochemistry and Petrology
  • Paleontology
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Inorganic Chemistry

The primary research topics covered by their publications consist of:

  • Geochemistry and Elemental Analysis
  • Paleontology and Stratigraphy of Fossils
  • Geology and Paleoclimatology Research
  • Radioactive element chemistry and processing
  • Geological and Geochemical Analysis
  • Clay minerals and soil interactions
  • Astro and Planetary Science

Clark M. Johnson has coauthored multiple papers with frequent collaborators including:

  • Brian L. Beard
  • Xin-Yuan Zheng
  • Stefan Weyer
  • Eric Roden
  • Andrew D. Czaja

They have published in several venues regularly, reflecting their research range and focus. Frequent publication venues include:

  • Earth-Science Reviews
  • Geochimica et Cosmochimica Acta
  • Goldschmidt Abstracts
  • Earth and Planetary Science Letters
  • Scientific Reports

Selected recent research papers by Clark M. Johnson include:

  • "Early Archean biogeochemical iron cycling and nutrient availability: New insights from a 3.5 Ga land-sea transition" (2022) published in Earth-Science Reviews

Other notable papers relevant to their field, coauthored or related, include:

  • "Stable potassium (K) isotope characteristics at mid-ocean ridge hydrothermal vents and its implications for the global K cycle" (2022) in Earth and Planetary Science Letters
  • "Life on a Mesoarchean marine shelf - insights from the world's oldest known granular iron formation" (2020) in Scientific Reports
  • "Natural Potassium (K) Isotope Fractionation during Corn Growth and Quantification of K Fertilizer Recovery Efficiency Using Stable K Isotope Labeling" (2022) in ACS Earth and Space Chemistry
  • "Stable Fe isotope fractionation during dissimilatory Fe(III) reduction by a thermoacidophile in acidic hydrothermal environments" (2020) in Geochimica et Cosmochimica Acta

Among their distinctions, Clark M. Johnson was awarded the IEEE Fellow in 1991 for contributions to the theory and application of photoelectrons, image conversion, and electron multiplication.

Best Publications

  • Application of Fe isotopes to tracing the geochemical and biological cycling of Fe

    Brian L. Beard;Clark M. Johnson;Joseph L. Skulan;Kenneth H. Nealson

  • The Iron Isotope Fingerprints of Redox and Biogeochemical Cycling in Modern and Ancient Earth

    Clark M. Johnson;Brian L. Beard;Eric E. Roden

  • Iron isotope biosignatures.

    Brian L. Beard;Clark M. Johnson;Lea Cox;Henry Sun

  • Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

    Kurt O. Konhauser;Noah J. Planavsky;Noah J. Planavsky;Dalton S. Hardisty;Leslie J. Robbins

  • Strontium Isotope Composition of Skeletal Material Can Determine the Birth Place and Geographic Mobility of Humans and Animals

    Brian L. Beard;Clark M. Johnson

  • Kinetic and equilibrium Fe isotope fractionation between aqueous Fe(II) and Fe(III)

    S.A. Welch;B.L. Beard;C.M. Johnson;P.S. Braterman

  • Iron isotope constraints on Fe cycling and mass balance in oxygenated Earth oceans

    Brian L. Beard;Clark M. Johnson;Karen L. Von Damm;Rebecca L. Poulson

  • Residential Mobility in the Prehistoric Southwest United States: A Preliminary Study using Strontium Isotope Analysis

    T.Douglas Price;Clark M. Johnson;Joseph A. Ezzo;Jonathan Ericson

  • Isotopic fractionation between Fe(III) and Fe(II) in aqueous solutions

    Clark M. Johnson;Joseph L. Skulan;Brian L. Beard;Henry Sun

  • Atom Exchange between Aqueous Fe(II) and Goethite: An Fe Isotope Tracer Study

    Robert M. Handler;Brian L. Beard;Clark M. Johnson;Michelle M. Scherer

  • Iron isotope fractionation by Fe(II)-oxidizing photoautotrophic bacteria

    Laura R. Croal;Clark M. Johnson;Brian L. Beard;Dianne K. Newman

  • Iron isotopes constrain biologic and abiologic processes in banded iron formation genesis

    Clark M. Johnson;Brian L. Beard;Cornelis Klein;Nic J. Beukes

  • Mobility of Bell Beaker people revealed by strontium isotope ratios of tooth and bone: a study of southern Bavarian skeletal remains

    Gisela Grupe;T. Douglas Price;Peter Schröter;Frank Söllner

  • Burial rates during prograde metamorphism of an ultra-high-pressure terrane: an example from Lago di Cignana, western Alps, Italy

    Thomas J. Lapen;Clark M. Johnson;Lukas P. Baumgartner;Nancy J. Mahlen

  • Ancient geochemical cycling in the Earth as inferred from Fe isotope studies of banded iron formations from the Transvaal Craton

    Clark M. Johnson;Brian L. Beard;Nicolas J. Beukes;Cornelis Klein

  • Fe Isotope Variations in the Modern and Ancient Earth and Other Planetary Bodies

    Brian L. Beard;Clark M. Johnson

  • The effect of early diagenesis on the Fe isotope compositions of porewaters and authigenic minerals in continental margin sediments

    Silke Severmann;Clark M. Johnson;Brian L. Beard;James McManus

  • Fe, C, and O isotope compositions of banded iron formation carbonates demonstrate a major role for dissimilatory iron reduction in ~2.5 Ga marine environments

    Adriana Heimann;Adriana Heimann;Adriana Heimann;Clark M. Johnson;Clark M. Johnson;Brian L. Beard;Brian L. Beard;John W. Valley;John W. Valley

  • Geochemistry of non-traditional stable isotopes

    Clark M. Johnson;Braian L. Beard;Francis Albarède

  • The mechanisms of iron isotope fractionation produced during dissimilatory Fe(III) reduction by Shewanella putrefaciens and Geobacter sulfurreducens

    Heidi A. Crosby;Eric E. Roden;Clark M. Johnson;Brian L. Beard

  • Analytical Perspectives on Prehistoric Migration: A Case Study From East-Central Arizona

    Joseph A. Ezzo;Clark M. Johnson;T.Douglas Price

Frequent Co-Authors

Brian L. Beard
Brian L. Beard University of Wisconsin–Madison
Eric E. Roden
Eric E. Roden University of Wisconsin–Madison
Weiqiang Li
Weiqiang Li Nanjing University
Brian R. Jicha
Brian R. Jicha University of Wisconsin–Madison
John W. Valley
John W. Valley University of Wisconsin–Madison
Brad S. Singer
Brad S. Singer University of Wisconsin–Madison
Nicolas J. Beukes
Nicolas J. Beukes University of Johannesburg
Alan R. Carroll
Alan R. Carroll University of Wisconsin–Madison
Lukas P. Baumgartner
Lukas P. Baumgartner University of Lausanne
Michelle M. Scherer
Michelle M. Scherer University of Iowa

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