Samuel Hammer

4.6k total citations · 1 hit paper
95 papers, 2.3k citations indexed

About

Samuel Hammer is a scholar working on Global and Planetary Change, Atmospheric Science and Ecology, Evolution, Behavior and Systematics. According to data from OpenAlex, Samuel Hammer has authored 95 papers receiving a total of 2.3k indexed citations (citations by other indexed papers that have themselves been cited), including 49 papers in Global and Planetary Change, 40 papers in Atmospheric Science and 33 papers in Ecology, Evolution, Behavior and Systematics. Recurrent topics in Samuel Hammer's work include Atmospheric and Environmental Gas Dynamics (47 papers), Lichen and fungal ecology (30 papers) and Atmospheric chemistry and aerosols (27 papers). Samuel Hammer is often cited by papers focused on Atmospheric and Environmental Gas Dynamics (47 papers), Lichen and fungal ecology (30 papers) and Atmospheric chemistry and aerosols (27 papers). Samuel Hammer collaborates with scholars based in Germany, United States and France. Samuel Hammer's co-authors include Ingeborg Levin, Bernd Kromer, Frank Meinhardt, Casimiro Pio, Felix Vogel, David Griffith, Michel Legrand, Christopher Caldow, Anne Kasper‐Giebl and András Gelencsér and has published in prestigious journals such as Journal of Geophysical Research Atmospheres, The Science of The Total Environment and Geophysical Research Letters.

In The Last Decade

Samuel Hammer

93 papers receiving 2.3k citations

Hit 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.

ATMOSPHERIC RADIOCARBON FOR THE PERIOD 1950–2019

2021 234 citations Quan Hua, Jocelyn Turnbull et al. Radiocarbon profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Samuel Hammer Germany	23	1.5k	1.2k	364	354	248	95	2.3k
T. Rahn United States	29	1.1k 0.7×	1.1k 0.9×	335 0.9×	433 1.2×	51 0.2×	61	2.2k
Noriyuki Тanaka Japan	27	973 0.7×	687 0.6×	103 0.3×	672 1.9×	197 0.8×	127	2.3k
Jocelyn Turnbull United States	28	2.3k 1.6×	2.0k 1.7×	515 1.4×	726 2.1×	53 0.2×	86	3.9k
Andrew J. Schauer United States	30	1.5k 1.0×	991 0.8×	180 0.5×	1.0k 2.9×	39 0.2×	93	3.1k
Dario Camuffo Italy	35	1.5k 1.0×	1.5k 1.2×	329 0.9×	134 0.4×	100 0.4×	190	4.4k
Kengo Sudo Japan	34	3.2k 2.2×	2.8k 2.3×	1.3k 3.7×	223 0.6×	182 0.7×	90	4.5k
P. Monfray France	35	1.9k 1.3×	3.2k 2.6×	127 0.3×	963 2.7×	45 0.2×	66	5.0k
Britton B. Stephens United States	34	2.9k 2.0×	3.3k 2.7×	471 1.3×	441 1.2×	22 0.1×	80	4.4k
John Weber United States	24	820 0.6×	340 0.3×	191 0.5×	392 1.1×	78 0.3×	85	2.2k
Akinori Ito Japan	34	3.3k 2.2×	2.7k 2.2×	995 2.7×	253 0.7×	95 0.4×	79	4.4k

Countries citing papers authored by Samuel Hammer

Since Specialization

Citations

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

Fields of papers citing papers by Samuel Hammer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Samuel Hammer

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

All Works

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20 of 20 papers shown

Christen, Andreas, Armin Jordan, R. Kneißl, et al.. (2025). A relaxed eddy accumulation flask sampling system for ¹⁴ C-based partitioning of fossil and non-fossil CO ₂ fluxes. Atmospheric measurement techniques. 18(20). 5349–5373. 1 indexed citations

Stagakis, Stavros, Dominik Brunner, Natascha Kljun, et al.. (2025). Sectoral attribution of greenhouse gas and pollutant emissions using multi-species eddy covariance on a tall tower in Zurich, Switzerland. Atmospheric chemistry and physics. 25(21). 14279–14299.

Rödenbeck, Christian, et al.. (2024). Potential of ¹⁴ C-based vs. ΔCO-based ΔffCO ₂ observations to estimate urban fossil fuel CO ₂ (ffCO ₂ ) emissions. Atmospheric chemistry and physics. 24(14). 8183–8203. 3 indexed citations

Eglinton, Timothy I., Heather Graven, Peter A. Raymond, et al.. (2023). Making the case for an International Decade of Radiocarbon. Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences. 381(2261). 20230081–20230081. 6 indexed citations

Rödenbeck, Christian, Christoph Gerbig, Samuel Hammer, et al.. (2023). The suitability of atmospheric oxygen measurements to constrain western European fossil-fuel CO ₂ emissions and their trends. Atmospheric chemistry and physics. 23(24). 15767–15782. 4 indexed citations

Jull, Andrew, Ellen R. M. Druffel, Steven R. Beaupré, et al.. (2022). RDC volume 64 issue 4 Cover and Front matter. Radiocarbon. 64(4). f1–f4. 1 indexed citations

Gerbig, Christoph, et al.. (2022). Effects of point source emission heights in WRF–STILT: a step towards exploiting nocturnal observations in models. Geoscientific model development. 15(13). 5391–5406. 10 indexed citations

Levin, Ingeborg, Ute Karstens, Sabrina G. Arnold, et al.. (2020). A dedicated flask sampling strategy developed for ICOS stations based on CO ₂ and CO measurements and STILT footprint modelling. 1 indexed citations

Levin, Ingeborg, Ute Karstens, Sabrina G. Arnold, et al.. (2020). A dedicated flask sampling strategy developed for Integrated Carbon Observation System (ICOS) stations based on CO ₂ and CO measurements and Stochastic Time-Inverted Lagrangian Transport (STILT) footprint modelling. Atmospheric chemistry and physics. 20(18). 11161–11180. 21 indexed citations

10.

Kutsch, Werner L., Jouni Heiskanen, Alex Vermeulen, et al.. (2018). ICOS and global initiatives working towards policy-relevant, coordinated carbon and greenhouse gas observations. EGU General Assembly Conference Abstracts. 12711. 2 indexed citations

11.

Graven, Heather, Colin E. Allison, David Etheridge, et al.. (2017). Compiled records of carbon isotopes in atmospheric CO ₂ for historical simulations in CMIP6. Geoscientific model development. 10(12). 4405–4417. 177 indexed citations

12.

Kretschmer, R., Christoph Gerbig, Ute Karstens, et al.. (2014). Impact of optimized mixing heights on simulated regional atmospheric transport of CO ₂. Atmospheric chemistry and physics. 14(14). 7149–7172. 26 indexed citations

13.

Hammer, Samuel, Gerlinde Konrad, Alex Vermeulen, et al.. (2013). Feasibility study of using a "travelling" CO ₂ and CH ₄ instrument to validate continuous in situ measurement stations. Atmospheric measurement techniques. 6(5). 1201–1216. 14 indexed citations

14.

Broquet, Grégoire, Frédéric Chevallier, François‐Marie Bréon, et al.. (2013). Regional inversion of CO ₂ ecosystem fluxes from atmospheric measurements: reliability of the uncertainty estimates. Atmospheric chemistry and physics. 13(17). 9039–9056. 46 indexed citations

15.

Czeczuga, B., et al.. (2004). Carotenoids in the thalli of Cladonia grayi Merrill from sites of varied degrees of insolation. Journal of The Hattori Botanical Laboratory. 285–291. 2 indexed citations

16.

Hammer, Samuel. (1997). Growth dynamics in Cladonia grayi. Mycologia. 89(6). 900–907. 2 indexed citations

17.

Hammer, Samuel. (1997). Branching dynamics in Cladina subtenuis. Mycologia. 89(3). 461–467. 7 indexed citations

18.

Hammer, Samuel. (1996). Modular growth in verticillate podetia of Cladonia. Mycologia. 88(4). 533–538. 8 indexed citations

19.

Hammer, Samuel. (1996). Variation and variability in Cladonia section Perviae. Mycologia. 88(1). 71–79. 8 indexed citations

20.

Hammer, Samuel. (1996). CLADONIA BIOGEOGRAPHY IN PACIFIC AREAS OF THE UNITED STATES. Journal of The Hattori Botanical Laboratory. 80(80). 307–322. 5 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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