World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 37 6851 6345 2397 2121 125 5232

Mark A. Engle publications per year

The chart shows the history of publications by Mark A. Engle between 2001 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Mark A. Engle published across 26 years, from 2001 to 2026, averaging 6 papers a year. Output peaked at 13 publications in 2014. 10 of the 157 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 2001 to 2026. Vertical axis: number of publications, 0 to 13. Peak 13 publications in 2014. 2001: 2 publications 2002: 1 publication 2003: 2 publications 2004: 1 publication 2005: 2 publications 2006: 3 publications 2007: 1 publication 2008: 6 publications 2009: 3 publications 2010: 5 publications 2011: 7 publications 2012: 3 publications 2013: 10 publications 2014: 13 publications 2015: 10 publications 2016: 8 publications 2017: 3 publications 2018: 10 publications 2019: 8 publications 2020: 11 publications 2021: 9 publications 2022: 13 publications 2023: 9 publications 2024: 7 publications 2025: 9 publications 2026: 1 publication
2001 2026

157 publications in total across all disciplines

View publications per year as a table
Mark A. Engle: publications per year, 2001 to 2026
Year Publications
2001 2
2002 1
2003 2
2004 1
2005 2
2006 3
2007 1
2008 6
2009 3
2010 5
2011 7
2012 3
2013 10
2014 13
2015 10
2016 8
2017 3
2018 10
2019 8
2020 11
2021 9
2022 13
2023 9
2024 7
2025 9
2026 1
Total 157
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Mark A. Engle 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 Mark A. Engle 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, 118–127 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: 125 publications — 25th percentile

25% 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
118–127 540 125
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
578–587 14
588–597 5
598–602 4
603+ 100
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Mark A. Engle 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 Mark A. Engle 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, 37 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: 37 D-Index — 27th percentile

27% 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 37
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
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

Mark A. Engle is affiliated with The University of Texas at El Paso in the United States. Their research spans Environmental Science and Engineering, with a focus on subfields such as Global and Planetary Change, Mechanics of Materials, Artificial Intelligence, Geochemistry and Petrology, and Pollution. The scientist has contributed extensively to studies involving atmospheric and environmental gas dynamics, hydrocarbon exploration and reservoir analysis, geochemistry and geologic mapping, groundwater and isotope geochemistry, coal and its by-products, heavy metals in the environment, and hydraulic fracturing and reservoir analysis.

Their recent publications include:

  • Can we beneficially reuse produced water from oil and gas extraction in the U.S.? (2020, The Science of The Total Environment)
  • Characterization of produced water and surrounding surface water in the Permian Basin, the United States (2022, Journal of Hazardous Materials)
  • Origin and geochemistry of formation waters from the lower Eagle Ford Group, Gulf Coast Basin, south central Texas (2020, Chemical Geology)
  • Utica Shale Play Oil and Gas Brines: Geochemistry and Factors Influencing Wastewater Management (2020, Environmental Science & Technology)
  • Coal elemental (compositional) data analysis with hierarchical clustering algorithms (2021, International Journal of Coal Geology)

Mark A. Engle collaborates frequently with multiple co-authors including Matthew S. Varonka, Aaron M. Jubb, Denise M. Akob, Isabelle M. Cozzarelli, and Douglas B. Kent. These collaborations reflect an interdisciplinary approach bridging environmental chemistry and geosciences.

Publication venues where this scientist has been active include:

  • Abstracts with programs - Geological Society of America
  • The Science of The Total Environment
  • International Journal of Coal Geology
  • Environmental Science & Technology
  • Natural Resources Research

Their research outputs demonstrate consistent engagement with environmental science themes focused on geochemical characterization and environmental impacts related to hydrocarbon extraction and water resource analysis. This body of work contributes to understanding fluid interactions in subsurface environments, waste management, and the environmental consequences of energy resource development.

Best Publications

  • Organic substances in produced and formation water from unconventional natural gas extraction in coal and shale

    William H. Orem;Calin A. Tatu;Matthew S. Varonka;Harry E. Lerch

  • Radium content of oil- and gas-field produced waters in the northern Appalachian Basin (USA): Summary and discussion of data

    E.L. Rowan;M.A. Engle;C.S. Kirby;T.F. Kraemer

  • Hydraulic fracturing water use variability in the United States and potential environmental implications.

    Tanya J. Gallegos;Brian A. Varela;Seth S. Haines;Mark A. Engle;Mark A. Engle

  • Geochemical and isotopic evolution of water produced from Middle Devonian Marcellus shale gas wells, Appalachian basin, Pennsylvania

    Elisabeth L. Rowan;Mark A. Engle;Thomas F. Kraemer;Karl T. Schroeder

  • Quantifying natural source mercury emissions from the Ivanhoe Mining District, north-central Nevada, USA

    Mark A. Engle;Mae Sexauer Gustin;Hong Zhang

  • Can we beneficially reuse produced water from oil and gas extraction in the U.S.

    Bridget R Scanlon;Robert C Reedy;Pei Xu;M Engle

  • Geochemistry of formation waters from the Wolfcamp and “Cline” shales: Insights into brine origin, reservoir connectivity, and fluid flow in the Permian Basin, USA

    Mark A. Engle;Mark A. Engle;Francisco R. Reyes;Matthew S. Varonka;William H. Orem

  • Geochemical evolution of produced waters from hydraulic fracturing of the Marcellus Shale, northern Appalachian Basin: A multivariate compositional data analysis approach

    Mark A. Engle;Mark A. Engle;Elisabeth L. Rowan

  • Environmental signatures and effects of an oil and gas wastewater spill in the Williston Basin, North Dakota.

    Isabelle M. Cozzarelli;Katherine Skalak;D.B. Kent;Mark A. Engle

  • Wastewater Disposal from Unconventional Oil and Gas Development Degrades Stream Quality at a West Virginia Injection Facility

    Denise M. Akob;Adam C. Mumford;William Orem;Mark A. Engle

  • Discharges of produced waters from oil and gas extraction via wastewater treatment plants are sources of disinfection by-products to receiving streams.

    Michelle L. Hladik;Michael J. Focazio;Mark Engle;Mark Engle

  • Atmospheric mercury emissions from mine wastes and surrounding geologically enriched terrains

    M. Sexauer Gustin;M. F. Coolbaugh;M. A. Engle;B. C. Fitzgerald

  • CO2, CO, and Hg emissions from the Truman Shepherd and Ruth Mullins coal fires, eastern Kentucky, USA

    Jennifer M.K. O'Keefe;Kevin R. Henke;James C. Hower;Mark A. Engle

  • Mercury exchange between the atmosphere and low mercury containing substrates

    Mae Sexauer Gustin;Mark Engle;Jody Ericksen;Seth N. Lyman

  • Gas emissions, minerals, and tars associated with three coal fires, Powder River Basin, USA.

    Mark A. Engle;Mark A. Engle;Lawrence F. Radke;Edward L. Heffern;Jennifer M.K. O'Keefe

  • Volatile-organic molecular characterization of shale-oil produced water from the Permian Basin

    Naima A. Khan;Mark A. Engle;Barry Dungan;F. Omar Holguin

  • The influence of ozone on atmospheric emissions of gaseous elemental mercury and reactive gaseous mercury from substrates

    Mark A. Engle;Mae Sexauer Gustin;Steve E. Lindberg;Alan W. Gertler

  • Mercury distribution in two Sierran forest and one desert sagebrush steppe ecosystems and the effects of fire.

    Mark A. Engle;Mae Sexauer Gustin;Dale W. Johnson;James F. Murphy

  • Comparison of atmospheric mercury speciation and deposition at nine sites across central and eastern North America

    Mark A. Engle;Michael T. Tate;David P. Krabbenhoft;James J. Schauer

  • The Tiptop coal-mine fire, Kentucky: Preliminary investigation of the measurement of mercury and other hazardous gases from coal-fire gas vents

    James C. Hower;Kevin R. Henke;Jennifer M.K. O'Keefe;Mark A. Engle

Frequent Co-Authors

William H. Orem
William H. Orem United States Geological Survey
James C. Hower
James C. Hower University of Kentucky
Isabelle M. Cozzarelli
Isabelle M. Cozzarelli United States Geological Survey
David P. Krabbenhoft
David P. Krabbenhoft United States Geological Survey
Mae Sexauer Gustin
Mae Sexauer Gustin University of Nevada Reno
Pei Xu
Pei Xu New Mexico State University
Peter B. McMahon
Peter B. McMahon United States Geological Survey
Lawrence F. Radke
Lawrence F. Radke National Center for Atmospheric Research
Donald R. Blake
Donald R. Blake University of California, Irvine
Fraser Goff
Fraser Goff New Mexico Institute of Mining and Technology

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