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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 72 840 741 399 342 300 20977

Katherine H. Freeman publications per year

The chart shows the history of publications by Katherine H. Freeman between 1986 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Katherine H. Freeman published across 41 years, from 1986 to 2026, averaging 8.9 papers a year. Output peaked at 28 publications in 2018. 10 of the 364 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1986 to 2026. Vertical axis: number of publications, 0 to 28. Peak 28 publications in 2018. 1986: 1 publication 1987: 1 publication 1988: 0 publications 1989: 1 publication 1990: 2 publications 1991: 2 publications 1992: 2 publications 1993: 2 publications 1994: 4 publications 1995: 1 publication 1996: 1 publication 1997: 8 publications 1998: 6 publications 1999: 9 publications 2000: 6 publications 2001: 14 publications 2002: 7 publications 2003: 13 publications 2004: 9 publications 2005: 9 publications 2006: 4 publications 2007: 11 publications 2008: 15 publications 2009: 11 publications 2010: 10 publications 2011: 13 publications 2012: 22 publications 2013: 15 publications 2014: 10 publications 2015: 13 publications 2016: 12 publications 2017: 14 publications 2018: 28 publications 2019: 26 publications 2020: 11 publications 2021: 11 publications 2022: 8 publications 2023: 15 publications 2024: 7 publications 2025: 9 publications 2026: 1 publication
1986 2026

364 publications in total across all disciplines

View publications per year as a table
Katherine H. Freeman: publications per year, 1986 to 2026
Year Publications
1986 1
1987 1
1988 0
1989 1
1990 2
1991 2
1992 2
1993 2
1994 4
1995 1
1996 1
1997 8
1998 6
1999 9
2000 6
2001 14
2002 7
2003 13
2004 9
2005 9
2006 4
2007 11
2008 15
2009 11
2010 10
2011 13
2012 22
2013 15
2014 10
2015 13
2016 12
2017 14
2018 28
2019 26
2020 11
2021 11
2022 8
2023 15
2024 7
2025 9
2026 1
Total 364
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Katherine H. Freeman 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 Katherine H. Freeman 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, 298–307 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: 300 publications — 86th percentile

86% 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
298–307 120 300
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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Katherine H. Freeman 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 Katherine H. Freeman 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, 72 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: 72 D-Index — 91st percentile

91% 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 72
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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Research.com Recognitions

  • 2013 - Fellow of American Geophysical Union (AGU)
  • 2013 - Member of the National Academy of Sciences
  • 2010 - Fellow of John Simon Guggenheim Memorial Foundation
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America
  • Fellow of the Geological Society of America

Overview

Katherine H. Freeman is affiliated with Pennsylvania State University in the United States. Their research spans a range of topics within Earth and Planetary Sciences and Environmental Science, with a focus on both broad and specialized areas.

The primary fields of study include:

  • Earth and Planetary Sciences
  • Environmental Science

More specific subfields investigated by Freeman encompass:

  • Atmospheric Science
  • Ecology
  • Astronomy and Astrophysics
  • Paleontology
  • Environmental Chemistry

Their work covers several main topics, including:

  • Geology and Paleoclimatology Research
  • Isotope Analysis in Ecology
  • Hydrocarbon exploration and reservoir analysis
  • Methane Hydrates and Related Phenomena
  • Astro and Planetary Science
  • Mass Spectrometry Techniques and Applications
  • Paleontology and Stratigraphy of Fossils

Freeman has published extensively, contributing to notable scientific venues. Frequent publication outlets feature:

  • Abstracts with programs - Geological Society of America
  • Annual Review of Earth and Planetary Sciences
  • Paleoceanography and Paleoclimatology
  • Palaeogeography Palaeoclimatology Palaeoecology
  • Geochimica et Cosmochimica Acta

Among recent published papers are:

  • "Fire distinguishers: Refined interpretations of polycyclic aromatic hydrocarbons for paleo-applications" (2020, Geochimica et Cosmochimica Acta)
  • "Organic matter from the Chicxulub crater exacerbated the K-Pg impact winter" (2020, Proceedings of the National Academy of Sciences)
  • "Abundant ammonia and nitrogen-rich soluble organic matter in samples from asteroid (101955) Bennu" (2025, Nature Astronomy)
  • "Microbial life in the nascent Chicxulub crater" (2020, Geology)
  • "Origin of a global carbonate layer deposited in the aftermath of the Cretaceous-Paleogene boundary impact" (2020, Earth and Planetary Science Letters)

Freeman has collaborated frequently with several researchers, including:

  • Allison A. Baczynski
  • Allison T. Karp
  • Kliti Grice
  • Raymond Jeanloz
  • Shelby Lyons

The scientist has received recognition in the form of several awards and honors:

  • Member of the National Academy of Sciences (2013)
  • Fellow of American Geophysical Union (AGU) (2013)
  • Fellow of John Simon Guggenheim Memorial Foundation (2010)
  • Fellow of the Geological Society of America

Best Publications

  • Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene

    Mark Pagani;James C. Zachos;James C. Zachos;James C. Zachos;Katherine H. Freeman;Katherine H. Freeman;Katherine H. Freeman;Brett Tipple;Brett Tipple;Brett Tipple

  • Molecular Paleohydrology: Interpreting the Hydrogen-Isotopic Composition of Lipid Biomarkers from Photosynthesizing Organisms

    Dirk Sachse;Isabelle Billault;Gabriel J. Bowen;Yoshito Chikaraishi

  • Compound-specific isotopic analyses: a novel tool for reconstruction of ancient biogeochemical processes.

    J.M. Hayes;Katherine H. Freeman;Brian N. Popp;Christopher H. Hoham

  • Global patterns in leaf 13C discrimination and implications for studies of past and future climate

    Aaron F. Diefendorf;Kevin E. Mueller;Scott. L. Wing;Paul L. Koch

  • Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO2 levels

    Katherine Haines Freeman;J. M. Hayes

  • Evidence from carbon isotope measurements for diverse origins of sedimentary hydrocarbons.

    Katherine H. Freeman;J. M. Hayes;Jean Michel Trendel;Pierre Albrecht

  • Transient Floral Change and Rapid Global Warming at the Paleocene-Eocene Boundary

    Scott L. Wing;Guy J. Harrington;Francesca A. Smith;Francesca A. Smith;Jonathan I. Bloch

  • Late Miocene Atmospheric CO2 Concentrations and the Expansion of C4 Grasses

    Mark Pagani;Katherine H. Freeman;Michael A. Arthur

  • Miocene evolution of atmospheric carbon dioxide

    Mark Pagani;Mark Pagani;Michael A. Arthur;Katherine H. Freeman

  • Consistent fractionation of 13C in nature and in the laboratory: growth-rate effects in some haptophyte algae.

    Robert R. Bidigare;Arnim Fluegge;Arnim Fluegge;Katherine H. Freeman;Kristi L. Hanson

  • Climate change as the dominant control on glacial-interglacial variations in C3 and C4 plant abundance

    Y. Huang;F. A. Street-Perrott;S. E. Metcalfe;M. Brenner

  • New insights into Archean sulfur cycle from mass-independent sulfur isotope records from the Hamersley Basin, Australia

    Shuhei Ono;Jennifer L. Eigenbrode;Alexander A. Pavlov;Pushker Kharecha

  • Influence of physiology and climate on δD of leaf wax n-alkanes from C3 and C4 grasses

    Francesca A. Smith;Katherine H. Freeman

  • Production of n-alkyl lipids in living plants and implications for the geologic past

    Aaron F. Diefendorf;Katherine H. Freeman;Scott L. Wing;Heather V. Graham

  • Slow release of fossil carbon during the Palaeocene-Eocene Thermal Maximum

    Ying Cui;Lee R. Kump;Andy J. Ridgwell;Adam J. Charles

  • Paleoaltimetry of the Tibetan Plateau from D/H ratios of lipid biomarkers

    Pratigya J. Polissar;Katherine H. Freeman;David B. Rowley;Francesca A. McInerney

  • Late Archean rise of aerobic microbial ecosystems

    Jennifer L. Eigenbrode;Katherine H. Freeman

  • Molecular and isotopic records of C4 grassland expansion in the late miocene

    K.H. Freeman;L.A. Colarusso

  • Water column anoxia, enhanced productivity and concomitant changes in δ13C and δ34S across the Frasnian–Famennian boundary (Kowala — Holy Cross Mountains/Poland)

    Michael M Joachimski;Christian Ostertag-Henning;Richard D Pancost;Harald Strauss

  • Carbon isotope geochemistry of the Frasnian–Famennian transition

    MM Joachimski;Rich D Pancost;KH Freeman;C Ostertag-Henning

  • Magnitude of the carbon isotope excursion at the Paleocene-Eocene thermal maximum: The role of plant community change

    Francesca A. Smith;Francesca A. Smith;Scott L. Wing;Katherine H. Freeman

  • SUPPLEMENTARY MATERIAL FOR "Molecular paleohydrology: interpreting the hydrogen-isotopic composition of lipid biomarkers from photosynthesizing organisms"

    Dirk Sachse;Isabelle Billault;Gabriel J. Bowen;Yoshito Chikaraishi

Frequent Co-Authors

Ian G. Stanistreet
Ian G. Stanistreet University of Liverpool
Richard D. Pancost
Richard D. Pancost University of Bristol
Michael A. Arthur
Michael A. Arthur Pennsylvania State University
Lee R. Kump
Lee R. Kump Pennsylvania State University
Kliti Grice
Kliti Grice Curtin University
Stuart G. Wakeham
Stuart G. Wakeham Skidaway Institute of Oceanography
Timothy J. Bralower
Timothy J. Bralower Pennsylvania State University
Scott L. Wing
Scott L. Wing National Museum of Natural History
Simon C. Brassell
Simon C. Brassell Indiana University

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