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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 34 8110 7522 824 764 169 3548

Clemens V. Ullmann publications per year

The chart shows the history of publications by Clemens V. Ullmann between 2010 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Clemens V. Ullmann published across 17 years, from 2010 to 2026, averaging 11.2 papers a year. Output peaked at 38 publications in 2021. 10 of the 190 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 2010 to 2026. Vertical axis: number of publications, 0 to 38. Peak 38 publications in 2021. 2010: 2 publications 2011: 1 publication 2012: 2 publications 2013: 6 publications 2014: 8 publications 2015: 9 publications 2016: 15 publications 2017: 13 publications 2018: 10 publications 2019: 8 publications 2020: 30 publications 2021: 38 publications 2022: 11 publications 2023: 18 publications 2024: 9 publications 2025: 8 publications 2026: 2 publications
2010 2026

190 publications in total across all disciplines

View publications per year as a table
Clemens V. Ullmann: publications per year, 2010 to 2026
Year Publications
2010 2
2011 1
2012 2
2013 6
2014 8
2015 9
2016 15
2017 13
2018 10
2019 8
2020 30
2021 38
2022 11
2023 18
2024 9
2025 8
2026 2
Total 190
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Clemens V. Ullmann 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 Clemens V. Ullmann 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, 168–177 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: 169 publications — 49th percentile

49% 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
168–177 490 169
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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Clemens V. Ullmann 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 Clemens V. Ullmann 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, 34 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: 34 D-Index — 15th percentile

15% 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 34
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
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

Clemens V. Ullmann is affiliated with the University of Exeter in the United Kingdom. The primary focus of their research lies within the fields of Earth and Planetary Sciences and Environmental Science. Their work often involves detailed investigations in subfields including Paleontology, Atmospheric Science, Geophysics, Oceanography, and Global and Planetary Change.

The scientist's research covers a range of topics, notably:

  • Paleontology and Stratigraphy of Fossils
  • Geology and Paleoclimatology Research
  • Geological and Geochemical Analysis
  • Methane Hydrates and Related Phenomena
  • Hydrocarbon Exploration and Reservoir Analysis
  • Marine Bivalve and Aquaculture Studies
  • Isotope Analysis in Ecology

Ullmann has contributed to several peer-reviewed publications. Selected recent papers include:

  • Orbital pacing and secular evolution of the Early Jurassic carbon cycle, 2020, published in Proceedings of the National Academy of Sciences
  • Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods, 2020, published in Scientific Reports
  • Absolute seasonal temperature estimates from clumped isotopes in bivalve shells suggest warm and variable greenhouse climate, 2021, published in Communications Earth & Environment
  • Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry, 2020, published in Earth and Planetary Science Letters
  • Reconstructing the magnitude of Early Toarcian (Jurassic) warming using the reordered clumped isotope compositions of belemnites, 2020, published in Geochimica et Cosmochimica Acta

Frequent collaborators of Ullmann include:

  • Nicolas Thibault
  • Stephen P. Hesselbo
  • Christoph Korte
  • Niels J. de Winter
  • Philippe Claeys

The primary venues in which this scientist publishes are:

  • Zenodo (CERN European Organization for Nuclear Research)
  • Scientific Reports
  • Newsletters on Stratigraphy
  • Climate of the Past
  • Research Square (Research Square)

Best Publications

  • Jurassic climate mode governed by ocean gateway

    Christoph Korte;Stephen P. Hesselbo;Clemens V. Ullmann;Clemens V. Ullmann;Gerd Dietl

  • Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse

    Christian M. Ø. Rasmussen;Clemens V. Ullmann;Kristian G. Jakobsen;Anders Lindskog

  • Evolution of the Toarcian (Early Jurassic) carbon-cycle and global climatic controls on local sedimentary processes (Cardigan Bay Basin, UK)

    Weimu Xu;Micha Ruhl;Hugh C. Jenkyns;Melanie J. Leng;Melanie J. Leng

  • Orbital pacing and secular evolution of the Early Jurassic carbon cycle

    Marisa S. Storm;Marisa S. Storm;Stephen P. Hesselbo;Hugh C. Jenkyns;Micha Ruhl;Micha Ruhl

  • Astronomical constraints on the duration of the Early Jurassic Pliensbachian Stage and global climatic fluctuations

    Micha Ruhl;Stephen P. Hesselbo;Stephen P. Hesselbo;Linda Hinnov;Hugh C. Jenkyns

  • Diagenetic alteration in low-Mg calcite from macrofossils: a review

    Clemens V. Ullmann;Christoph Korte

  • Effect of a Jurassic oceanic anoxic event on belemnite ecology and evolution.

    Clemens Vinzenz Ullmann;Nicolas Thibault;Micha Ruhl;Micha Ruhl;Stephen P. Hesselbo

  • The wider context of the Lower Jurassic Toarcian oceanic anoxic event in Yorkshire coastal outcrops, UK

    Nicolas Thibault;Micha Ruhl;Clemens V. Ullmann;Christoph Korte

  • Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods.

    C V Ullmann;C V Ullmann;R Boyle;L V Duarte;S P Hesselbo

  • Partial diagenetic overprint of Late Jurassic belemnites from New Zealand: Implications for the preservation potential of δ7Li values in calcite fossils

    Clemens Vinzenz Ullmann;Clemens Vinzenz Ullmann;Hamish J. Campbell;Robert Frei;Stephen P. Hesselbo

  • The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms

    Mathieu Dellinger;A. Joshua West;Guillaume Paris;Jess F. Adkins

  • Discerning primary versus diagenetic signals in carbonate carbon and oxygen isotope records: An example from the Permian–Triassic boundary of Iran

    Martin Schobben;Clemens Vinzenz Ullmann;Clemens Vinzenz Ullmann;Lucyna Leda;Dieter Korn

  • Oxygen isotope fluctuations in a modern North Sea oyster (Crassostrea gigas) compared with annual variations in seawater temperature: Implications for palaeoclimate studies

    Clemens V. Ullmann;Uwe Wiechert;Christoph Korte;Christoph Korte

  • Fungal decomposition of terrestrial organic matter accelerated Early Jurassic climate warming

    Grzegorz Pieńkowski;Marta Hodbod;Clemens V. Ullmann

  • Sinemurian–Pliensbachian calcareous nannofossil biostratigraphy and organic carbon isotope stratigraphy in the Paris Basin: Calibration to the ammonite biozonation of NW Europe

    Leonie Peti;Nicolas Thibault;Marie-Emilie Clémence;Christoph Korte

  • The Giant Pacific Oyster (Crassostrea gigas) as a modern analog for fossil ostreoids: Isotopic (Ca, O, C) and elemental (Mg/Ca, Sr/Ca, Mn/Ca) proxies

    Clemens V. Ullmann;Clemens V. Ullmann;Florian Böhm;Rosalind E.M. Rickaby;Uwe Wiechert

  • Integrated bio- and carbon-isotope stratigraphy of the Upper Cretaceous Gurpi Formation (Iran): A new reference for the eastern Tethys and its implications for large-scale correlation of stage boundaries

    Mohammad J. Razmjooei;Mohammad J. Razmjooei;Nicolas Thibault;Anoshiravan Kani;Jaume Dinarès-Turell

  • Crystallographic control on lithium isotope fractionation in Archean to Cenozoic lithium-cesium-tantalum pegmatites

    Tomas Magna;Milan Novák;Jan Cempírek;Vojtech Janousek

  • Absolute seasonal temperature estimates from clumped isotopes in bivalve shells suggest warm and variable greenhouse climate

    Niels J. de Winter;Niels J. de Winter;Inigo A. Müller;Ilja J. Kocken;Nicolas Thibault

  • Permian strontium isotope stratigraphy

    Christoph Korte;Clemens V. Ullmann

  • Chemical and isotopic architecture of the belemnite rostrum

    CV Ullmann;CV Ullmann;R Frei;C Korte;Stephen P. Hesselbo

  • Chemostratigraphy Across the Triassic–Jurassic Boundary

    Christoph Korte;Micha Ruhl;Micha Ruhl;József Pálfy;József Pálfy;Clemens Vinzenz Ullmann

Frequent Co-Authors

Christoph Korte
Christoph Korte University of Copenhagen
Stephen P. Hesselbo
Stephen P. Hesselbo University of Exeter
Nicolas Thibault
Nicolas Thibault University of Copenhagen
Micha Ruhl
Micha Ruhl Trinity College Dublin
Robert Frei
Robert Frei University of Copenhagen
Melanie J. Leng
Melanie J. Leng University of Nottingham
James B. Riding
James B. Riding British Geological Survey
Simon W. Poulton
Simon W. Poulton University of Leeds
Paul B. Wignall
Paul B. Wignall University of Leeds

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