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Earth Science
Denmark
2026

D-Index & Metrics

Earth Science

D-Index
82
Citations
19647
World Ranking
478
National Ranking
5

Robert Frei 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 Robert Frei 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+

This scientist: 339 publications — 90th percentile

90% of scientists in this discipline score the same or lower.

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

Robert Frei 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 Robert Frei 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+

This scientist: 82 D-Index — 95th percentile

95% of scientists in this discipline score the same or lower.

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

Research.com Recognitions

  • 2026 - Research.com Earth Science in Denmark Leader Award
  • 2025 - Research.com Earth Science in Denmark Leader Award
  • 2023 - Research.com Earth Science in Denmark Leader Award
  • 2022 - Research.com Earth Science in Denmark Leader Award

Overview

Robert Frei is affiliated with the University of Copenhagen in Denmark and has focused their research primarily within the Earth and Planetary Sciences, publishing extensively across various subfields. Their work spans paleontology, geochemistry and petrology, geophysics, atmospheric science, and ecology, reflecting a broad engagement with the natural sciences relating to the Earth's physical processes and history.

Their research topics include geochemistry and elemental analysis, paleontology and stratigraphy of fossils, geological and geochemical analysis, geology and paleoclimatology research, isotope analysis in ecology, archaeology, and ancient environmental studies, as well as geochemistry and geologic mapping. These areas highlight an interdisciplinary approach combining geological, chemical, and ecological perspectives to study the Earth's environments and past climates.

Frei has contributed to multiple frequent publication venues, which include:

  • Chemical Geology
  • Precambrian Research
  • SSRN Electronic Journal
  • The Science of The Total Environment
  • Journal of South American Earth Sciences

Notable recent papers authored or co-authored by Robert Frei include:

  • "Enhanced soil quality with reduced tillage and solid manures in organic farming - a synthesis of 15 years" (2020, Scientific Reports)
  • "Biogeochemical cycle of chromium isotopes at the modern Earth's surface and its applications as a paleo-environment proxy" (2020, Chemical Geology)
  • "A transient swing to higher oxygen levels in the atmosphere and oceans at ~1.4 Ga" (2020, Precambrian Research)
  • "Goldilocks at the dawn of complex life: mountains might have damaged Ediacaran-Cambrian ecosystems and prompted an early Cambrian greenhouse world" (2021, Scientific Reports)
  • "The link between surface water and groundwater-based drinking water - strontium isotope spatial distribution patterns and their relationships to Danish sediments" (2020, Applied Geochemistry)

The researcher often collaborates with a range of co-authors, including Karin Margarita Frei, Anja B. Frank, Claudio Gaucher, Jesper Allan Frederiksen, and Robert Klaebe. These frequent collaborations indicate a networked approach to their scientific inquiry, contributing to diverse multi-author studies.

Best Publications

  • History of Atmospheric Lead Deposition Since 12,370 14C yr BP from a Peat Bog, Jura Mountains, Switzerland

    W. Shotyk;D. Weiss;P. G. Appleby;A. K. Cheburkin

  • Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes

    Robert Frei;Claudio Gaucher;Simon W. Poulton;Don E. Canfield

  • Atmospheric oxygenation three billion years ago

    Sean Andrew Crowe;Lasse N. Døssing;Lasse N. Døssing;Nicolas J. Beukes;Michael Bau

  • Geochemistry of the peat bog at Etang de la Gruère, Jura Mountains, Switzerland, and its record of atmospheric Pb and lithogenic trace metals (Sc, Ti, Y, Zr, and REE) since 12,370 14 C yr BP

    W. Shotyk;D. Weiss;J.D. Kramers;R. Frei

  • Tracing the Indian Ocean Mantle Domain Through Time: Isotopic Results from Old West Indian, East Tethyan, and South Pacific Seafloor

    J. J. Mahoney;R. Frei;M. L. G. Tejada;X. X. Mo

  • U-rich Archaean sea-floor sediments from Greenland - indications of >3700 Ma oxygenic photosynthesis

    Minik T. Rosing;Robert Frei

  • New Lu–Hf and Pb–Pb age constraints on the earliest animal fossils

    Gry H Barfod;Francis Albarède;Andrew H Knoll;Shuhai Xiao

  • Tracing the dynamic life story of a Bronze Age Female

    Karin Margarita Frei;Ulla Mannering;Kristian Kristiansen;Morten E. Allentoft

  • Anthropogenic contributions to atmospheric Hg, Pb and As accumulation recorded by peat cores from southern Greenland and Denmark dated using the 14C “bomb pulse curve”

    W. Shotyk;Michael Evan Goodsite;F. Roos-Barraclough;R. Frei

  • The geographic distribution of strontium isotopes in Danish surface waters – A base for provenance studies in archaeology, hydrology and agriculture

    Karin M. Frei;Robert Frei

  • Unraveling the record of successive high grade events in the Central Zone of the Limpopo Belt using Pb single phase dating of metamorphic minerals

    L. Holzer;R. Frei;J.M. Barton;J.D. Kramers

  • Source heterogeneity for the major components of ∼ 3.7 Ga Banded Iron Formations (Isua Greenstone Belt, Western Greenland): Tracing the nature of interacting water masses in BIF formation

    Robert Frei;Ali Polat

  • Oxygenation of the mid-Proterozoic atmosphere: clues from chromium isotopes in carbonates

    G.J. Gilleaudeau;R. Frei;A.J. Kaufman;L.C. Kah

  • Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen.

    Donald E. Canfield;Shuichang Zhang;Anja B. Frank;Xiaomei Wang

  • The genesis of Archaean chromitites from the Nuasahi and Sukinda massifs in the Singhbhum Craton, India

    Sisir K. Mondal;Edward M. Ripley;Chusi Li;Robert Frei

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

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

  • Distribution of platinum-Group elements and Os isotopes in chromite ores from Mayarí-Baracoa Ophiolitic Belt (eastern Cuba).

    F. Gervilla;J.A. Proenza;R. Frei;J.M. González-Jiménez

  • Post-collisional transition from calc-alkaline to alkaline magmatism during transcurrent deformation in the southernmost Dom Feliciano Belt (Braziliano-Pan-African, Uruguay)

    Pedro Oyhantçabal;Siegfried Siegesmund;Klaus Wemmer;Robert Frei

  • Reduction of hexavalent chromium by ferrous iron: A process of chromium isotope fractionation and its relevance to natural environments

    L.N. Døssing;K. Dideriksen;S.L.S. Stipp;R. Frei

  • The behavior of molybdenum and its isotopes across the chemocline and in the sediments of sulfidic Lake Cadagno, Switzerland

    Tais Wittchen Dahl;Ariel Anbar;Gwyneth Gordon;Minik Rosing

  • Single mineral PbPb dating

    Robert Frei;Balz S. Kamber

Frequent Co-Authors

Ali Polat
Ali Polat University of Windsor
Clemens V. Ullmann
Clemens V. Ullmann University of Exeter
Minik T. Rosing
Minik T. Rosing University of Copenhagen
Alcides N. Sial
Alcides N. Sial Federal University of Pernambuco
Christoph Korte
Christoph Korte University of Copenhagen
Jan Kramers
Jan Kramers University of Johannesburg
Anders Meibom
Anders Meibom École Polytechnique Fédérale de Lausanne
Valderez P. Ferreira
Valderez P. Ferreira Federal University of Pernambuco
Thomas F. Nägler
Thomas F. Nägler University of Bern
Donald E. Canfield
Donald E. Canfield University of Southern Denmark

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