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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 37 6864 6358 3 3 135 5165

Tõnu Martma publications per year

The chart shows the history of publications by Tõnu Martma between 1985 and 2024, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Tõnu Martma published across 40 years, from 1985 to 2024, averaging 3.7 papers a year. Output peaked at 14 publications in 2016. 11 of the 147 publications appeared in the last two years.

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

147 publications in total across all disciplines

View publications per year as a table
Tõnu Martma: publications per year, 1985 to 2024
Year Publications
1985 1
1986 1
1987 1
1988 0
1989 0
1990 0
1991 0
1992 0
1993 0
1994 0
1995 0
1996 1
1997 1
1998 0
1999 1
2000 0
2001 2
2002 5
2003 4
2004 3
2005 6
2006 2
2007 3
2008 5
2009 6
2010 5
2011 7
2012 6
2013 7
2014 8
2015 6
2016 14
2017 9
2018 10
2019 7
2020 10
2021 4
2022 1
2023 8
2024 3
Total 147
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Tõnu Martma 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 Tõnu Martma 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, 128–137 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: 135 publications — 31st percentile

31% 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
128–137 557 135
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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Tõnu Martma 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 Tõnu Martma 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

Tõnu Martma is affiliated with Tallinn University of Technology in Estonia. Their research predominantly lies within the field of Earth and Planetary Sciences, with a strong focus on various subfields including Atmospheric Science, Paleontology, Geochemistry and Petrology, Environmental Chemistry, and Mechanics of Materials.

The scientist's work covers several main topics that span paleontological and geological research and climate-related studies. These topics include:

  • Paleontology and Stratigraphy of Fossils
  • Geology and Paleoclimatology Research
  • Cryospheric Studies and Observations
  • Geochemistry and Elemental Analysis
  • Climate Change and Permafrost
  • Methane Hydrates and Related Phenomena
  • Atmospheric Chemistry and Aerosols

Tõnu Martma has contributed extensively to scientific literature, with recent publications addressing diverse geological and environmental issues. Notable papers include:

  • Marine redox variability from Baltica during extinction events in the latest Ordovician-early Silurian, 2020, published in Palaeogeography Palaeoclimatology Palaeoecology
  • Controls on the 14C Content of Dissolved and Particulate Organic Carbon Mobilized Across the Mackenzie River Basin, Canada, 2020, published in Global Biogeochemical Cycles
  • Measurement report: Spatial variations in ionic chemistry and water-stable isotopes in the snowpack on glaciers across Svalbard during the 2015-2016 snow accumulation season, 2021, published in Atmospheric Chemistry and Physics
  • Oxygenated conditions in the aftermath of the Lomagundi-Jatuli Event: The carbon isotope and rare earth element signatures of the Paleoproterozoic Zaonega Formation, Russia, 2020, published in Precambrian Research
  • A multi-proxy approach to constrain reducing conditions in the Baltic Basin during the late Silurian Lau carbon isotope excursion, 2021, published in Palaeogeography Palaeoclimatology Palaeoecology

Frequent collaborators in Tõnu Martma's research include:

  • Seth A. Young
  • Olle Hints
  • Jeremy D. Owens
  • Aivo Lepland
  • Christian Zdanowicz

The scholar's research has appeared repeatedly in several prominent scientific venues, illustrating a consistent engagement with the scientific community. Key publication outlets include:

  • Abstracts with Programs - Geological Society of America
  • Proceedings of the Estonian Academy of Sciences Geology
  • Palaeogeography Palaeoclimatology Palaeoecology
  • Atmospheric Chemistry and Physics
  • Global Biogeochemical Cycles

Best Publications

  • High-resolution stable isotope stratigraphy of Upper Ordovician sequences: Constraints on the timing of bioevents and environmental changes associated with mass extinction and glaciation

    P.J. Brenchley;G.A. Carden;L. Hints;D. Kaljo

  • Middle and Upper Ordovician carbon isotope chemostratigraphy in Baltoscandia: A correlation standard and clues to environmental history

    L. Ainsaar;D. Kaljo;T. Martma;T. Meidla

  • Carbon isotope event markers through the Wenlock–Pridoli sequence at Ohesaare (Estonia) and Priekule (Latvia)

    D Kaljo;T Kiipli;T Martma

  • Timescales of methane seepage on the Norwegian margin following collapse of the Scandinavian Ice Sheet

    Antoine Crémière;Aivo Lepland;Shyam Chand;Diana Sahy

  • Post-Hunnebergian Ordovician carbon isotope trend in Baltoscandia, its environmental implications and some similarities with that of Nevada

    Dimitri Kaljo;Tõnu Martma;Tõnis Saadre

  • Late Ordovician carbon isotope trend in Estonia, its significance in stratigraphy and environmental analysis

    Dimitri Kaljo;Linda Hints;Tõnu Martma;Jaak Nõlvak

  • Implications of Gondwana glaciations in the Baltic late Ordovician and Silurian and a carbon isotopic test of environmental cyclicity

    Dimitri Kaljo;Tõnu Martma;Peep Männik;Viive Viira

  • Effect of periodic melting on geochemical and isotopic signals in an ice core from Lomonosovfonna, Svalbard

    V. A. Pohjola;J. C. Moore;E. Isaksson;T. Jauhiainen

  • Isotopic measurements of precipitation on central Asian glaciers (Southeastern Tibet, northern Himalayas, central Tien Shan)

    Vladimir Aizen;Elena Aizen;John Melack;Tonu Martma

  • Thousand years of winter surface air temperature variations in Svalbard and northern Norway reconstructed from ice-core data

    Dmitri Divine;Elisabeth Isaksson;Tonu Martma;Harro A. J Meijer

  • Snow contribution to first-year and second-year Arctic sea ice mass balance north of Svalbard

    Mats A. Granskog;Anja Rösel;Paul A. Dodd;Dmitry Divine

  • EVIDENCE FOR A WIDESPREAD CARBON ISOTOPIC EVENT ASSOCIATED WITH LATE MIDDLE ORDOVICIAN SEDIMENTOLOGICAL AND FAUNAL CHANGES IN ESTONIA

    Leho Ainsaar;Tonu Meidla;Tonu Martma

  • Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500 k.y.) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery–Wenlock (Silurian) boundary: Is a unified Phanerozoic time scale achievable?

    Bradley D. Cramer;David K. Loydell;Christian Samtleben;Axel Munnecke

  • The Middle Caradoc Facies and Faunal Turnover in the Late Ordovician Baltoscandian palaeobasin

    Leho Ainsaar;Tõnu Meidla;Tõnu Martma

  • Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous catchment

    Kaire Toming;Kaire Toming;Lea Tuvikene;Sirje Vilbaste;Helen Agasild

  • Effect of glacial drainage water on the CO2 system and ocean acidification state in an Arctic tidewater-glacier fjord during two contrasting years

    Agneta Fransson;Melissa Chierici;Daiki Nomura;Daiki Nomura;Mats A. Granskog

  • Carbon isotope stratigraphy in the latest Ordovician of Estonia

    D Kaljo;L Hints;T Martma;J Nõlvak

  • Fluid source and methane-related diagenetic processes recorded in cold seep carbonates from the Alvheim channel, central North Sea

    Antoine Crémière;Aivo Lepland;Shyam Chand;Diana Sahy

  • A new ice-core record from Lomonosovfonna, Svalbard: viewing the 1920-97 data in relation to present climate and environmental conditions

    Elisabeth Isaksson;Veijo Pohjola;Tauno Jauhiainen;John Moore

  • Unprecedented low twentieth century winter sea ice extent in the Western Nordic Seas since A.D. 1200

    M. Macias Fauria;A. Grinsted;A. Grinsted;S. Helama;J. Moore;J. Moore;J. Moore

  • Three global carbon isotope shifts in the Silurian of Podolia (Ukraine): stratigraphical implications

    Dimitri Kaljo;Volodymyr Grytsenko;Tõnu Martma;Mari-Ann Mõtus

  • A 160,000-year-old history of tectonically controlled methane seepage in the Arctic.

    Tobias Himmler;Diana Sahy;Tõnu Martma;Gerhard Bohrmann

Frequent Co-Authors

Elisabeth Isaksson
Elisabeth Isaksson Norwegian Polar Institute
Veijo A. Pohjola
Veijo A. Pohjola Uppsala University
John C. Moore
John C. Moore Beijing Normal University
Dmitry Divine
Dmitry Divine Norwegian Polar Institute
Harro A. J. Meijer
Harro A. J. Meijer University of Groningen
Jack Kohler
Jack Kohler Norwegian Polar Institute
R. S. W. van de Wal
R. S. W. van de Wal Utrecht University
Mats A. Granskog
Mats A. Granskog Norwegian Polar Institute
Jeremy D. Owens
Jeremy D. Owens Florida State University
Margit Schwikowski
Margit Schwikowski Paul Scherrer Institute

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