C. U. Hammer

16.4k total citations · 5 hit papers
74 papers, 11.5k citations indexed

About

C. U. Hammer is a scholar working on Atmospheric Science, Ecology and Astronomy and Astrophysics. According to data from OpenAlex, C. U. Hammer has authored 74 papers receiving a total of 11.5k indexed citations (citations by other indexed papers that have themselves been cited), including 64 papers in Atmospheric Science, 25 papers in Ecology and 9 papers in Astronomy and Astrophysics. Recurrent topics in C. U. Hammer's work include Geology and Paleoclimatology Research (50 papers), Cryospheric studies and observations (43 papers) and Isotope Analysis in Ecology (15 papers). C. U. Hammer is often cited by papers focused on Geology and Paleoclimatology Research (50 papers), Cryospheric studies and observations (43 papers) and Isotope Analysis in Ecology (15 papers). C. U. Hammer collaborates with scholars based in Denmark, United States and France. C. U. Hammer's co-authors include W. Dansgaard, Henrik Clausen, S. J. Johnsen, N. Gundestrup, J. P. Steffensen, H. B. Clausen, Dorthe Dahl‐Jensen, Gérard C. Bond, Christine S. Hvidberg and A. E. Sveinbjörnsdottír and has published in prestigious journals such as Nature, Science and Journal of Geophysical Research Atmospheres.

In The Last Decade

C. U. Hammer

74 papers receiving 10.5k citations

Hit Papers

5 papers align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Evidence for general instability of past climate from a 250-kyr ice-core record

1993 3.5k citations W. Dansgaard, S. J. Johnsen et al. Nature profile →
Irregular glacial interstadials recorded in a new Greenland ice core

1992 1.2k citations Henrik Clausen, W. Dansgaard et al. Nature profile →
Asynchrony of Antarctic and Greenland climate change during the last glacial period

1998 553 citations H. B. Clausen, C. U. Hammer et al. Nature profile →
Greenland ice sheet evidence of post-glacial volcanism and its climatic impact

1980 509 citations C. U. Hammer, H. B. Clausen et al. Nature profile →
Synchronized Terrestrial Atmospheric Deglacial Records Around the North Atlantic

1996 485 citations Svante Björck, Bernd Kromer et al. Science profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
C. U. Hammer Denmark	40	10.4k	3.0k	2.1k	1.8k	1.7k	74	11.5k
N. Gundestrup Denmark	35	10.2k 1.0×	2.5k 0.8×	1.9k 0.9×	1.7k 0.9×	1.4k 0.9×	81	11.0k
Gifford H. Miller United States	72	12.1k 1.2×	3.6k 1.2×	2.4k 1.1×	2.5k 1.4×	2.5k 1.5×	286	14.9k
Marie‐France Loutre Belgium	47	8.4k 0.8×	2.0k 0.6×	1.6k 0.7×	2.1k 1.2×	1.7k 1.0×	104	9.7k
J. Jouzel France	62	13.9k 1.3×	4.1k 1.3×	2.1k 1.0×	1.9k 1.1×	1.4k 0.9×	176	15.3k
Nicklas G. Pisias United States	43	9.5k 0.9×	3.5k 1.1×	1.7k 0.8×	2.5k 1.4×	1.9k 1.2×	94	10.9k
William Showers United States	36	6.0k 0.6×	3.1k 1.0×	1.4k 0.7×	1.7k 1.0×	2.5k 1.5×	81	8.8k
A. J. T. Jull United States	63	7.6k 0.7×	3.7k 1.2×	2.2k 1.1×	1.8k 1.0×	3.3k 2.0×	387	13.3k
N. J. Shackleton United Kingdom	47	8.7k 0.8×	2.8k 0.9×	1.7k 0.8×	2.2k 1.3×	2.8k 1.7×	80	10.0k
C. Lorius France	38	9.3k 0.9×	3.2k 1.0×	1.1k 0.5×	1.0k 0.6×	977 0.6×	103	11.3k
Edward J. Brook United States	51	9.1k 0.9×	2.5k 0.8×	1.6k 0.8×	1.5k 0.9×	978 0.6×	172	10.4k

Countries citing papers authored by C. U. Hammer

Since Specialization

Citations

This map shows the geographic impact of C. U. Hammer'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 C. U. Hammer with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites C. U. Hammer more than expected).

Fields of papers citing papers by C. U. Hammer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by C. U. Hammer. 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 C. U. Hammer. The network helps show where C. U. Hammer may publish in the future.

Co-authorship network of co-authors of C. U. Hammer

This figure shows the co-authorship network connecting the top 25 collaborators of C. U. Hammer. A scholar is included among the top collaborators of C. U. Hammer 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 C. U. Hammer. C. U. Hammer is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Barbante, Carlo, Natalie Kehrwald, Paola Marianelli, et al.. (2013). Greenland ice core evidence of the 79 AD Vesuvius eruption. Climate of the past. 9(3). 1221–1232. 19 indexed citations

Yan, Ming, Yuansheng Li, C. U. Hammer, et al.. (2002). Oxygen isotope composition of surface snow collected along the traverse route from Zhongshan Station toward Dome A, Antarctica. Institutional Repository National Institute of Polar Research (National Institute of Polar Research (Japan)). 16(16). 133–139. 3 indexed citations

Hammer, C. U.. (2001). Locating the Hans Tausen drill site. 39. 71–80. 2 indexed citations

Hammer, C. U., S. J. Johnsen, Henrik Clausen, et al.. (2001). The paleoclimatic record from a 345 m long ice core from the Hans Tausen Iskappe. 39. 87–95. 20 indexed citations

Clausen, H. B., et al.. (2001). Glaciological and chemical studies on ice cores from Hans Tausen Iskappe, Greenland. 39. 6 indexed citations

Hammer, C. U.. (2001). The Hans Tausen Ice Cap. Glaciology and glacial geology: Foreword. 39. 4–4. 3 indexed citations

Clausen, Henrik, C. U. Hammer, Christine S. Hvidberg, et al.. (1997). A comparison of the volcanic records over the past 4000 years from the Greenland Ice Core Project and Dye 3 Greenland ice cores. Journal of Geophysical Research Atmospheres. 102(C12). 26707–26723. 141 indexed citations

Angelis, M. de, J. P. Steffensen, Michel Legrand, Henrik Clausen, & C. U. Hammer. (1997). Primary aerosol (sea salt and soil dust) deposited in Greenland ice during the last climatic cycle: Comparison with east Antarctic records. Journal of Geophysical Research Atmospheres. 102(C12). 26681–26698. 115 indexed citations

Hammer, C. U., H. B. Clausen, & Chester C. Langway. (1997). 50,000 YEARS OF RECORDED GLOBAL VOLCANISM. Climatic Change. 35(1). 1–15. 64 indexed citations

10.

Björck, Svante, Bernd Kromer, S. J. Johnsen, et al.. (1996). Synchronized Terrestrial Atmospheric Deglacial Records Around the North Atlantic. Science. 274(5290). 1155–1160. 485 indexed citations breakdown →

11.

Clausen, H. B. & C. U. Hammer. (1988). The Laki and Tambora Eruptions as Revealed in Greenland Ice Cores from 11 Locations. Annals of Glaciology. 10. 16–22. 126 indexed citations

12.

Maurette, M., C. U. Hammer, M. Pourchet, & D. E. Brownlee. (1988). The "Blue Lake II" Expedition of July-August 1987 in Greenland, and the Search for mm-size Unmelted Extraterrestrial Particles. Lunar and Planetary Science Conference. 19. 744. 3 indexed citations

13.

Hammer, C. U., et al.. (1988). Dating of the Santorini eruption. Nature. 332(6163). 401–402. 3 indexed citations

14.

Hammer, C. U.. (1986). Glaciology: Frozen news on hot events. Nature. 322(6082). 778–778. 1 indexed citations

15.

Hammer, C. U., H. B. Clausen, & Chester C. Langway. (1985). The Byrd Ice Core: Continuous Acidity Measurements and Solid Electrical Conductivity Measurements. Annals of Glaciology. 7. 214–214. 16 indexed citations

16.

Hammer, C. U.. (1985). The Influence On Atmospheric Composition of Volcanic Eruptions as Derived From Ice-Core Analysis. Annals of Glaciology. 7. 125–129. 3 indexed citations

17.

Hammer, C. U.. (1980). Acidity of Polar Ice Cores in Relation to Absolute Dating, Past Volcanism, and Radio–Echoes. Journal of Glaciology. 25(93). 359–372. 39 indexed citations

18.

Reeh, Niels, H. B. Clausen, W. Dansgaard, et al.. (1978). Secular Trends of Accumulation Rates at Three Greenland Stations. Journal of Glaciology. 20(82). 27–30. 54 indexed citations

19.

Hammer, C. U., H. B. Clausen, W. Dansgaard, et al.. (1978). Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust. Journal of Glaciology. 20(82). 3–26. 210 indexed citations

20.

Johnsen, S. J., C. U. Hammer, Niels Reeh, & W. Dansgaard. (1977). Microparticles in “Byrd” station ice core: further comments on the paper by L. G. Thompson, W. L. Hamilton and C. Bull. Journal of Glaciology. 18(78). 164–164. 4 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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