D. O’Brien

1.7k total citations
36 papers, 1.3k citations indexed

About

D. O’Brien is a scholar working on Ecology, Environmental Engineering and Process Chemistry and Technology. According to data from OpenAlex, D. O’Brien has authored 36 papers receiving a total of 1.3k indexed citations (citations by other indexed papers that have themselves been cited), including 34 papers in Ecology, 20 papers in Environmental Engineering and 6 papers in Process Chemistry and Technology. Recurrent topics in D. O’Brien's work include Agriculture Sustainability and Environmental Impact (34 papers), Environmental Impact and Sustainability (20 papers) and Odor and Emission Control Technologies (6 papers). D. O’Brien is often cited by papers focused on Agriculture Sustainability and Environmental Impact (34 papers), Environmental Impact and Sustainability (20 papers) and Odor and Emission Control Technologies (6 papers). D. O’Brien collaborates with scholars based in Ireland, Germany and Poland. D. O’Brien's co-authors include L. Shalloo, C. Grainger, Michael Wallace, P. Crosson, Gary Lanigan, Brian Moran, T.M. Boland, J. Patton, D.A. Kenny and P.A. Foley and has published in prestigious journals such as Journal of Cleaner Production, Journal of Dairy Science and Journal of Environmental Management.

In The Last Decade

D. O’Brien

35 papers receiving 1.3k citations

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author Last Decade Papers Cites
D. O’Brien 1.0k 462 335 197 185 36 1.3k
Th.V. Vellinga 1.2k 1.2× 500 1.1× 432 1.3× 298 1.5× 250 1.4× 57 2.0k
Carolyn Opio 905 0.9× 245 0.5× 248 0.7× 143 0.7× 295 1.6× 8 1.5k
Judith L. Capper 911 0.9× 252 0.5× 656 2.0× 137 0.7× 226 1.2× 35 1.8k
Lisbeth Mogensen 1.3k 1.2× 563 1.2× 444 1.3× 119 0.6× 508 2.7× 85 2.3k
J. Humphreys 619 0.6× 235 0.5× 483 1.4× 538 2.7× 116 0.6× 85 1.6k
L. G. Barioni 497 0.5× 190 0.4× 220 0.7× 103 0.5× 117 0.6× 57 1.4k
Shannan Little 644 0.6× 233 0.5× 322 1.0× 111 0.6× 91 0.5× 17 873
R.L.M. Schils 840 0.8× 263 0.6× 551 1.6× 517 2.6× 67 0.4× 70 1.8k
Alan Rotz 529 0.5× 126 0.3× 366 1.1× 150 0.8× 70 0.4× 13 1.1k
Stefan Hörtenhuber 444 0.4× 214 0.5× 111 0.3× 106 0.5× 113 0.6× 52 918

Countries citing papers authored by D. O’Brien

Since Specialization
Citations

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

Fields of papers citing papers by D. O’Brien

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by D. O’Brien. 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 D. O’Brien. The network helps show where D. O’Brien may publish in the future.

Co-authorship network of co-authors of D. O’Brien

This figure shows the co-authorship network connecting the top 25 collaborators of D. O’Brien. A scholar is included among the top collaborators of D. O’Brien 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 D. O’Brien. D. O’Brien 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.
Basu, N. B., D. O’Brien, Cathal Buckley, et al.. (2025). Simulation of management practices to reduce nitrogen losses to water and air on well-drained grass-based dairy farms in derogation. Journal of Dairy Science. 108(8). 8548–8566.
2.
O’Brien, D., et al.. (2025). A life cycle assessment model of Irish grain cropping systems focused on carbon footprint. Irish Journal of Agricultural and Food Research. 64(1). 1 indexed citations
3.
Hennessy, Thia, et al.. (2024). Mitigation of gaseous emissions from dairy livestock: A farm-level method to examine the financial implications. Journal of Environmental Management. 352. 119904–119904. 6 indexed citations
4.
O’Brien, D., et al.. (2023). Environmental impact of grass-based cattle farms: A life cycle assessment of nature-based diversification scenarios. Resources Environment and Sustainability. 14. 100126–100126. 21 indexed citations
5.
6.
O’Brien, D., et al.. (2022). Life cycle assessment of pasture-based dairy production systems: Current and future performance. Journal of Dairy Science. 105(7). 5849–5869. 32 indexed citations
7.
Markiewicz‐Kęszycka, Maria, et al.. (2022). Pro-environmental diversification of pasture-based dairy and beef production in Ireland, the United Kingdom and New Zealand: a scoping review of impacts and challenges. Renewable Agriculture and Food Systems. 38. 10 indexed citations
8.
Hennessy, D., et al.. (2021). The simulated environmental impact of incorporating white clover into pasture-based dairy production systems. Journal of Dairy Science. 104(7). 7902–7918. 24 indexed citations
9.
Shalloo, L., et al.. (2021). Greenhouse gas emissions and nitrogen efficiency of dairy cows of divergent economic breeding index under seasonal pasture-based management. Journal of Dairy Science. 104(7). 8039–8049. 18 indexed citations
10.
Curran, Thomas P., et al.. (2021). Life cycle assessment of pasture-based suckler steer weanling-to-beef production systems: Effect of breed and slaughter age. animal. 15(7). 100247–100247. 28 indexed citations
11.
O’Brien, D., et al.. (2019). LIFE BEEF CARBON: a common framework for quantifying grass and corn based beef farms’ carbon footprints. animal. 14(4). 834–845. 20 indexed citations
12.
O’Brien, D., et al.. (2018). A national methodology to quantify the diet of grazing dairy cows. Journal of Dairy Science. 101(9). 8595–8604. 59 indexed citations
13.
Murphy, Eoin G., Thomas P. Curran, Nicholas M. Holden, D. O’Brien, & John Upton. (2017). Water footprinting of pasture-based farms; beef and sheep. animal. 12(5). 1068–1076. 9 indexed citations
14.
O’Brien, D., et al.. (2017). Evaluation of allocation methods for calculation of carbon footprint of grass-based dairy production. Journal of Environmental Management. 202(Pt 1). 311–319. 40 indexed citations
15.
O’Brien, D., Thia Hennessy, Brian Moran, & L. Shalloo. (2015). Relating the carbon footprint of milk from Irish dairy farms to economic performance. Journal of Dairy Science. 98(10). 7394–7407. 72 indexed citations
16.
O’Brien, D., Judith L. Capper, P. C. Garnsworthy, C. Grainger, & L. Shalloo. (2014). A case study of the carbon footprint of milk from high-performing confinement and grass-based dairy farms. Journal of Dairy Science. 97(3). 1835–1851. 116 indexed citations
17.
O’Brien, D., et al.. (2014). An appraisal of carbon footprint of milk from commercial grass-based dairy farms in Ireland according to a certified life cycle assessment methodology. The International Journal of Life Cycle Assessment. 19(8). 1469–1481. 58 indexed citations
18.
Murphy, Paul, P. Crosson, D. O’Brien, & Rogier P.O. Schulte. (2013). The Carbon Navigator: a decision support tool to reduce greenhouse gas emissions from livestock production systems. animal. 7. 427–436. 27 indexed citations
19.
O’Brien, D., C. Grainger, & L. Shalloo. (2013). Making sense of methods to audit emissions – various audit methods to estimate dairy production carbon footprint. Advances in Animal Biosciences. 4. 2–8. 1 indexed citations
20.
O’Brien, D., L. Shalloo, J. Patton, et al.. (2012). Evaluation of the effect of accounting method, IPCC v. LCA, on grass-based and confinement dairy systems’ greenhouse gas emissions. animal. 6(9). 1512–1527. 53 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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