Tom O'Halloran

Associate Professor
Forestry and Environmental Conservation Department, Baruch Institute of Coastal Ecology and Forest Science

Office: BICEFS
Phone: 843-546-1013
Fax: 843-546-6296

Email: tohallo@clemson.edu
Vita: Download CV
Personal Website: https://sites.google.com/g.clemson.edu/ohalloran/home

Educational Background

Ph.D. Environmental Sciences
University of Virginia 2008

M.S. Environmental Sciences
University of Virginia 2004

B.A. Environmental Sciences
University of Virginia 2001

Courses Taught

Introductory Micrometeorology
Ecosystem Service Values of Wetlands

Profile

Dr. O'Halloran is an associate professor stationed at the Baruch Institute of Coastal Ecology and Forest Science in Georgetown, SC. His research quantifies carbon, water energy and greenhouse gas cycling between the land surface and the atmosphere. His research increases understanding of how ecosystems respond to climate change, and in turn, how land management activities affect Earth's climate. He mostly studies forests and wetlands using environmental sensors deployed on towers, drones and satellites.

Research Interests

Forestry, wetland ecology, greenhouse gas fluxes, carbon sequestration and cycling, biometeorology, biogeophysics and albedo radiative forcing, disturbances and land management, bioenergy feedstocks, aerosols.

Publications

Furbeck, M.E., O’Halloran, T.L., Smith, E.M., Mozdzer, T.J., and K. Barrett. 2026. Rain Alters Spartina Alterniflora Light-Use Efficiency Through Leaf Rinsing, Diffuse Light, and Salinity at North Inlet, South Carolina. Estuaries and Coasts 49, 189. https://doi.org/10.1007/s12237-026-01804-4

Kuleba A.J., Fennessy M.S., Tomasko R., Bansal S., Herbert E,. O’Connell J., Podolinsky M., O’Halloran T.L. 2026. Environmental drivers of methane emissions in restored wetlands of the Glaciated Interior Plains. Ecological Engineering. https://doi.org/10.1016/j.ecoleng.2026.108047

Seyfried, G. S., Campbell, B. J., Giani, N., Gannon, D. G., & O’Halloran, T. L. 2026. Different mechanisms underlie plant-mediated methane transport in a tidal salt marsh versus an impounded brackish wetland. Journal of Geophysical Research: Biogeosciences, 131, e2025JG008987. https://doi.org/10.1029/2025JG008987

Seyfried, G.S., T.L. O'Halloran, B.J. Campbell, and N. Giani. 2025. Chamber level gas fluxes and soil biogeochemical properties from a tidal salt marsh and an impounded brackish wetland in South Carolina, USA ver 3. Environmental Data Initiative, (Dataset) https://doi.org/10.6073/pasta/08bab7404a446ab8c3d6607eb796aed8.

Reed, D.E., Chu, H., Peter, B.G., Chen, J., Abraha, M., Amiro, B., Anderson, R.G., Arain, M.A., Arruda, P., Barron-Gafford, G.A. and Bernacchi, C., et al., (incl. T.L. O'Halloran). 2025. Network of networks: Time series clustering of AmeriFlux sites. Agricultural and Forest Meteorology, 372, p.110686. https://doi.org/10.1016/j.agrformet.2025.110686

Liu, N., Sun, G., Yang, Y., Aguilos, M., Starr, G., O’Halloran, T.L., Amatya, D.M., Oishi, A.C., Zhang, Y. and Trettin, C., 2025. Potential for augmenting water yield by restoring longleaf pine (Pinus palustris) forests in the southeastern United States. Water Resources Research, 61(2), p.e2024WR037444. https://doi.org/10.1029/2024WR037444

Nelson, J. A., Walther, S., Gans, F., et al. [incl. T.L. O'Halloran]: X-BASE: the first terrestrial carbon and water flux products from an extended data-driven scaling framework, FLUXCOM-X, Biogeosciences, 21, 5079–5115, https://doi.org/10.5194/bg-21-5079-2024, 2024.

Clay, L.; Motallebi, M.; O’Halloran, T.L. Quantifying Ecosystem Services to Maximize Co-Benefits under Market-Based Conservation Solutions in the Edisto River Basin, South Carolina. Forests 2024, 15, 1796. https://doi.org/10.3390/f15101796

Huang, C.W., Domec, J.C., O’Halloran, T.L. and Hartzell, S., 2024. Dynamic interactions between groundwater level and discharge by phreatophytes. Advances in Water Resources, p.104814. https://doi.org/10.1016/j.advwatres.2024.104814

Aguilos, M., Sun, G., Liu, N., Zhang, Y., Starr, G., Oishi, A.C., O'Halloran, T.L., Forsythe, J.D., Wang, J., Zhu, M. and Amatya, D., 2024. Energy availability and leaf area dominate control of ecosystem evapotranspiration in the southeastern US. Agricultural and Forest Meteorology, 349, p.109960. https://doi.org/10.1016/j.agrformet.2024.109960

Zhu, Q., Chen, J., Charles P.-A., B., Sonnentag, O., Montagnani, L., O’Halloran, T. L., R.L. Scott, J.D. Forsythe++, B. Song, H. Zou, M. Duan, X. Li (2024). Albedo-induced global warming potential following disturbances in global temperate and boreal forests. Journal of Geophysical Research: Biogeosciences, 129, e2023JG007848. https://doi.org/10.1029/2023JG007848

Richardson, Jessica L., Ankur R. Desai, et al., [incl. T.L. O'Halloran]. 2024 On the Relationship Between Aquatic CO2 Concentration and Ecosystem Fluxes in Some of the World’s Key Wetland Types. Wetlands, 44(1), p.1. https://doi.org/10.1007/s13157-023-01751-x

O'Halloran T.L. and G.S. Seyfried. 2023. Plant traits and marsh fate. Nature Geoscience. https://doi.org/10.1038/s41561-022-01108-9

Puhlick, J.J., Brantley, S.T., O'Halloran, T.L., Clay, L. and Klepzig, K.D., 2022. Perspectives: Carbon markets might incentivize poorer ecological outcomes in longleaf pine ecosystems. Forest Ecology and Management, 520, p.120421. https://doi.org/10.1016/j.foreco.2022.120421

Ahlswede, B., O’Halloran, T.L., and R.Q. Thomas. Combined carbon and albedo climate forcing from pine and switchgrass grown for bioenergy. 2022. Frontiers in Forests and Global Change, Special Issue: Combined Carbon and Biophysical Climate Drivers From Forests and Forest Conversions. https://doi.org/10.3389/ffgc.2022.774067

Ahlswede, B., O’Halloran, T.L., Forsythe, J.D. and R.Q. Thomas. 2021. A minimally managed switchgrass ecosystem in a humid subtropical climate is a source of carbon to the atmosphere. Global Change Biology – Bioenergy. https://doi.org/10.1111/gcbb.12897.

Forsythe, J.D., O’Halloran, T.L. and Kline, M.A. An Eddy Covariance Mesonet For Measuring Greenhouse Gas Fluxes in Coastal South Carolina. 2020. Data, 5, 97. https://doi.org/10.3390/data5040097.

Bright, R. M. and O'Halloran, T. L.: Developing a monthly radiative kernel for surface albedo change from satellite climatologies of Earth's shortwave radiation budget: CACK v1.0, Geosci. Model Dev., 12, 3975–3990, https://doi.org/10.5194/gmd-12-3975-2019, 2019.

Bright, R.M., Davin, E., O'Halloran, T.L., Pongratz, J., Zhao, K., and A. Cescatti. Local temperature response to land cover and management change driven by non-radiative processes. Nature Climate Change. 2017. doi:10.1038/nclimate3250.

O'Halloran, T.L. and R. M. Bright. More diverse benefits from timber versus dedicated bioenergy plantations for terrestrial carbon dioxide removal. Environmental Research Letters. 2017. https://doi.org/10.1088/1748-9326/aa54ec
Atmospheric Chemistry and Physics, 9, 7361-7385.

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