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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.

38–42 publications: 1 scientists 43–47 publications: 0 scientists 48–52 publications: 3 scientists 53–57 publications: 8 scientists 58–62 publications: 11 scientists 63–67 publications: 16 scientists 68–72 publications: 24 scientists 73–77 publications: 31 scientists 78–82 publications: 49 scientists 83–87 publications: 77 scientists 88–92 publications: 86 scientists 93–97 publications: 88 scientists 98–102 publications: 92 scientists 103–107 publications: 84 scientists 108–112 publications: 102 scientists 113–117 publications: 108 scientists 118–122 publications: 117 scientists 123–127 publications: 126 scientists 128–132 publications: 146 scientists 133–137 publications: 114 scientists 138–142 publications: 102 scientists 143–147 publications: 127 scientists 148–152 publications: 102 scientists 153–157 publications: 112 scientists 158–162 publications: 102 scientists 163–167 publications: 127 scientists 168–172 publications: 121 scientists 173–177 publications: 112 scientists 178–182 publications: 109 scientists 183–187 publications: 98 scientists 188–192 publications: 92 scientists 193–197 publications: 105 scientists 198–202 publications: 77 scientists 203–207 publications: 80 scientists 208–212 publications: 89 scientists 213–217 publications: 70 scientists 218–222 publications: 74 scientists 223–227 publications: 74 scientists 228–232 publications: 70 scientists 233–237 publications: 67 scientists 238–242 publications: 59 scientists 243–247 publications: 67 scientists 248–252 publications: 51 scientists 253–257 publications: 46 scientists 258–262 publications: 41 scientists 263–267 publications: 39 scientists 268–272 publications: 34 scientists 273–277 publications: 39 scientists 278–282 publications: 35 scientists 283–287 publications: 36 scientists 288–292 publications: 35 scientists 293–297 publications: 29 scientists 298–302 publications: 23 scientists 303–307 publications: 39 scientists 308–312 publications: 34 scientists 313–317 publications: 23 scientists 318–322 publications: 18 scientists 323–327 publications: 18 scientists 328–332 publications: 21 scientists 333–337 publications: 20 scientists 338–342 publications: 15 scientists 343–347 publications: 13 scientists 348–352 publications: 24 scientists 353–357 publications: 25 scientists 358–362 publications: 10 scientists 363–367 publications: 20 scientists 368–372 publications: 17 scientists 373–377 publications: 18 scientists 378–382 publications: 15 scientists 383–387 publications: 7 scientists 388–392 publications: 22 scientists 393–397 publications: 9 scientists 398–402 publications: 11 scientists 403–407 publications: 16 scientists 408–412 publications: 4 scientists 413–417 publications: 5 scientists 418–422 publications: 14 scientists 423–427 publications: 8 scientists 428–432 publications: 7 scientists 433–437 publications: 7 scientists 438–442 publications: 10 scientists 443–447 publications: 10 scientists 448–452 publications: 3 scientists 453–457 publications: 9 scientists 458–462 publications: 11 scientists 463–467 publications: 4 scientists 468–472 publications: 6 scientists 473–477 publications: 11 scientists 478–482 publications: 8 scientists 483–487 publications: 2 scientists 488–492 publications: 3 scientists 493–497 publications: 4 scientists 498–502 publications: 4 scientists 503–507 publications: 4 scientists 508–509 publications: 4 scientists 510+ publications: 100 scientists
38 publications 510+

The last bar groups every scientist with 510 publications or more.

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.

30 D-Index: 15 scientists 31 D-Index: 42 scientists 32 D-Index: 60 scientists 33 D-Index: 90 scientists 34 D-Index: 103 scientists 35 D-Index: 108 scientists 36 D-Index: 142 scientists 37 D-Index: 147 scientists 38 D-Index: 147 scientists 39 D-Index: 152 scientists 40 D-Index: 143 scientists 41 D-Index: 157 scientists 42 D-Index: 141 scientists 43 D-Index: 151 scientists 44 D-Index: 140 scientists 45 D-Index: 135 scientists 46 D-Index: 121 scientists 47 D-Index: 108 scientists 48 D-Index: 128 scientists 49 D-Index: 111 scientists 50 D-Index: 106 scientists 51 D-Index: 112 scientists 52 D-Index: 102 scientists 53 D-Index: 103 scientists 54 D-Index: 94 scientists 55 D-Index: 61 scientists 56 D-Index: 101 scientists 57 D-Index: 71 scientists 58 D-Index: 65 scientists 59 D-Index: 78 scientists 60 D-Index: 93 scientists 61 D-Index: 56 scientists 62 D-Index: 58 scientists 63 D-Index: 52 scientists 64 D-Index: 63 scientists 65 D-Index: 49 scientists 66 D-Index: 53 scientists 67 D-Index: 57 scientists 68 D-Index: 50 scientists 69 D-Index: 44 scientists 70 D-Index: 44 scientists 71 D-Index: 31 scientists 72 D-Index: 33 scientists 73 D-Index: 33 scientists 74 D-Index: 23 scientists 75 D-Index: 32 scientists 76 D-Index: 24 scientists 77 D-Index: 17 scientists 78 D-Index: 19 scientists 79 D-Index: 9 scientists 80 D-Index: 21 scientists 81 D-Index: 20 scientists 82 D-Index: 17 scientists 83 D-Index: 19 scientists 84 D-Index: 19 scientists 85 D-Index: 14 scientists 86 D-Index: 6 scientists 87 D-Index: 14 scientists 88 D-Index: 17 scientists 89 D-Index: 10 scientists 90 D-Index: 8 scientists 91 D-Index: 8 scientists 92 D-Index: 9 scientists 93 D-Index: 6 scientists 94+ D-Index: 98 scientists
30 D-Index 94+

The last bar groups every scientist with 94 D-Index or more.

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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