Clemens V. Ullmann

3.6k total citations
93 papers, 2.7k citations indexed

About

Clemens V. Ullmann is a scholar working on Paleontology, Atmospheric Science and Geophysics. According to data from OpenAlex, Clemens V. Ullmann has authored 93 papers receiving a total of 2.7k indexed citations (citations by other indexed papers that have themselves been cited), including 69 papers in Paleontology, 49 papers in Atmospheric Science and 24 papers in Geophysics. Recurrent topics in Clemens V. Ullmann's work include Paleontology and Stratigraphy of Fossils (69 papers), Geology and Paleoclimatology Research (49 papers) and Geological and Geochemical Analysis (22 papers). Clemens V. Ullmann is often cited by papers focused on Paleontology and Stratigraphy of Fossils (69 papers), Geology and Paleoclimatology Research (49 papers) and Geological and Geochemical Analysis (22 papers). Clemens V. Ullmann collaborates with scholars based in United Kingdom, Denmark and Germany. Clemens V. Ullmann's co-authors include Christoph Korte, Stephen P. Hesselbo, Nicolas Thibault, Micha Ruhl, Robert Frei, Melanie J. Leng, James B. Riding, Weimu Xu, Marisa Storm and Hugh C. Jenkyns and has published in prestigious journals such as Proceedings of the National Academy of Sciences, Nature Communications and SHILAP Revista de lepidopterología.

In The Last Decade

Clemens V. Ullmann

86 papers receiving 2.6k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Clemens V. Ullmann United Kingdom 29 1.9k 1.3k 868 657 416 93 2.7k
Karem Azmy Canada 29 1.9k 1.0× 952 0.8× 913 1.1× 1.1k 1.7× 632 1.5× 113 2.6k
Guillaume Dera France 20 1.6k 0.8× 958 0.8× 760 0.9× 551 0.8× 312 0.8× 31 2.1k
T. R. Bailey United Kingdom 12 1.8k 1.0× 1.6k 1.2× 905 1.0× 643 1.0× 277 0.7× 16 2.8k
Guillaume Suan France 30 2.4k 1.3× 1.1k 0.9× 1.1k 1.3× 869 1.3× 526 1.3× 60 2.8k
Silke Voigt Germany 34 2.5k 1.3× 1.9k 1.5× 824 0.9× 671 1.0× 396 1.0× 80 3.3k
Emmanuelle Vennin France 33 1.9k 1.0× 990 0.8× 805 0.9× 442 0.7× 345 0.8× 108 2.7k
Yongbo Peng China 31 1.7k 0.9× 1.3k 1.1× 578 0.7× 874 1.3× 416 1.0× 92 2.8k
Annachiara Bartolini France 32 2.7k 1.4× 1.5k 1.2× 1.6k 1.9× 780 1.2× 341 0.8× 74 3.4k
Matías Reolid Spain 35 2.6k 1.3× 1.6k 1.2× 1.3k 1.5× 683 1.0× 361 0.9× 173 3.2k
Thomas Steuber Germany 32 2.2k 1.1× 1.3k 1.0× 677 0.8× 486 0.7× 441 1.1× 71 2.8k

Countries citing papers authored by Clemens V. Ullmann

Since Specialization
Citations

This map shows the geographic impact of Clemens V. Ullmann's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Clemens V. Ullmann with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Clemens V. Ullmann more than expected).

Fields of papers citing papers by Clemens V. Ullmann

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Clemens V. Ullmann. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Clemens V. Ullmann. The network helps show where Clemens V. Ullmann may publish in the future.

Co-authorship network of co-authors of Clemens V. Ullmann

This figure shows the co-authorship network connecting the top 25 collaborators of Clemens V. Ullmann. A scholar is included among the top collaborators of Clemens V. Ullmann based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Clemens V. Ullmann. Clemens V. Ullmann is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
2.
Kasemann, Simone A., Tanja Yvonne Klein, Clemens V. Ullmann, et al.. (2025). Ocean acidification at the Toarcian Anoxic Event captured by boron isotopes in the lime mud record. Communications Earth & Environment. 6(1). 533–533.
3.
Xiong, Yijun, Yafang Song, Crispin T. S. Little, et al.. (2024). Phosphorus in belemnites: Extraction, quantification, and variability. Chemical Geology. 663. 122266–122266. 1 indexed citations
4.
Vickers, Madeleine L., Morgan T. Jones, Jack Longman, et al.. (2024). Paleocene–Eocene age glendonites from the Mid-Norwegian Margin – indicators of cold snaps in the hothouse?. Climate of the past. 20(1). 1–23. 7 indexed citations
5.
Thibault, Nicolas, Bodil W. Lauridsen, Niels H. Schovsbo, et al.. (2023). The Late Maastrichtian Rørdal Member (Denmark): a remarkable window of climatic, environmental and biotic changes at orbital timescales. Geological Society London Special Publications. 545(1). 399–429. 2 indexed citations
6.
Hesselbo, Stephen P., et al.. (2023). Environmental changes during the onset of the Late Pliensbachian Event (Early Jurassic) in the Cardigan Bay Basin, Wales. Climate of the past. 19(5). 979–997. 7 indexed citations
7.
Schultz, Bo Pagh, P. V. Burger, Henrik Friis, et al.. (2023). Petrography and geochemical analysis of Arctic ikaite pseudomorphs from Utqiaġvik (Barrow), Alaska. Research at the University of Copenhagen (University of Copenhagen). 3 indexed citations
8.
Pearce, Martin A., Ian Jarvis, Johannes Monkenbusch, et al.. (2022). Coniacian–Campanian palynology, carbon isotopes and clay mineralogy of the Poigny borehole (Paris Basin) and its correlation in NW Europe. Comptes Rendus Géoscience. 354(S3). 45–65. 9 indexed citations
9.
10.
Vickers, Madeleine L., Martin Vickers, Rosalind E. M. Rickaby, et al.. (2022). The ikaite to calcite transformation: Implications for palaeoclimate studies. Geochimica et Cosmochimica Acta. 334. 201–216. 24 indexed citations
11.
Winter, Niels J. de, Inigo A. Müller, Ilja Kocken, et al.. (2021). Absolute seasonal temperature estimates from clumped isotopes in bivalve shells suggest warm and variable greenhouse climate. Communications Earth & Environment. 2(1). 38 indexed citations
12.
Vickers, Madeleine L., Álvaro Fernández, Stephen P. Hesselbo, et al.. (2020). Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry. Earth and Planetary Science Letters. 546. 116401–116401. 34 indexed citations
13.
Fernández, Álvaro, Christoph Korte, Clemens V. Ullmann, et al.. (2020). Reconstructing the magnitude of Early Toarcian (Jurassic) warming using the reordered clumped isotope compositions of belemnites. Geochimica et Cosmochimica Acta. 293. 308–327. 34 indexed citations
14.
Barnet, James S K, Dustin T. Harper, Leah J. LeVay, et al.. (2020). Coupled evolution of temperature and carbonate chemistry during the Paleocene–Eocene; new trace element records from the low latitude Indian Ocean. Earth and Planetary Science Letters. 545. 116414–116414. 17 indexed citations
15.
Vickers, Madeleine L., Sabine K. Lengger, Stefano M. Bernasconi, et al.. (2020). Cold spells in the Nordic Seas during the early Eocene Greenhouse. Nature Communications. 11(1). 4713–4713. 31 indexed citations
16.
Mette, Wolfgang, Nicolas Thibault, Leopold Krystyn, et al.. (2016). Field trip 11 - Rhaetian (Late Triassic) biotic and carbon isotope events and intraplatform basin development in the Northern Calcareous Alps, Tyrol, Austria. Research at the University of Copenhagen (University of Copenhagen). 1 indexed citations
17.
Ullmann, Clemens V., HJ Campbell, Robert Frei, & Christoph Korte. (2014). Geochemical signatures in Late Triassic brachiopods from New Caledonia. New Zealand Journal of Geology and Geophysics. 57(4). 420–431. 10 indexed citations
18.
Korte, Christoph, Stephen P. Hesselbo, Clemens V. Ullmann, Micha Ruhl, & Nicolas Thibault. (2014). Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics. Research at the University of Copenhagen (University of Copenhagen). 15944. 1 indexed citations
19.
Hesselbo, Stephen P., Christoph Korte, & Clemens V. Ullmann. (2013). Jurassic palaeoenvironmental change and the broader context of the Toarcian Oceanic Anoxic Event. EGUGA. 1 indexed citations
20.
Wiechert, Uwe, et al.. (2011). Lithium and Its Isotopes in Central European Rivers. Publication Database GFZ (GFZ German Research Centre for Geosciences). 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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