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Clemson University
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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

Vita: Download CV
Personal Website:


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


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.


O'Halloran T.L. and G.S. Seyfried. 2023. Plant traits and marsh fate. Nature Geoscience.

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.

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.

Williams, T.M., B. Williams, B. Song, T.L. O'Halloran, J.D. Forsythe++. 2022. Mapping natural forest stands with low-cost drones, Mathematical and Computational Forestry & Natural-Resource Sciences: Vol. 14: Iss.1, pp 22-42.

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.

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.

Seyednasrollah, B., et al. [incl. T.L. O'Halloran] 2019. PhenoCam Dataset v2.0: Vegetation Phenology from Digital Camera Imagery, 2000-2018. ORNL DAAC, Oak Ridge, Tennessee, USA. [DATASET]

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,, 2019.

Bright R. M. and T. L. O'Halloran. 2019. A monthly shortwave radiative forcing kernel for surface albedo change using CERES satellite data. Environmental Data Initiative. [DATASET].

Chu, H., D.D. Baldocchi, C. Poindexter, M. Abraha, A.R. Desai, G. Bohrer, M. Altaf Arain, T. Griffis, P.D. Blanken, T.L. O'Halloran, R.Q. Thomas, Q. Zhang, S. Burns, J.M. Frank, D. Christian, S. Brown, T.A. Black, C.M. Gough, B.E. Law, X. Lee, J.n Chen, D.E. Reed, W.J. Massman, K. Clark, J. Hatfield, J. Prueger, R. Bracho, J.M. Bake, T.A. Martin. 2018..Temporal dynamics of aerodynamic canopy height derived from eddy covariance momentum flux data across North American Flux Networks. Geophysical Research Letters. doi: 10.1029/2018GL079306

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.

O'Halloran, T.L., Fuentes, J.D., Tao, W.-K., and Li, X. Sensitivity of convection to observed variation in aerosol size and composition at a rural site in the southeastern United States. Journal of Atmospheric Chemistry. 2015. 10.1007/s10874-015-9300-x.

O'Halloran, T.L., Joerger, V., Law, B.E., Acker, S., Kertis, J. Post-fire influences of snag attrition on albedo and radiative forcing. Geophysical Research Letters. 2014. DOI: 10.1002/2014GL062024

Kathilankal, J. C., O'Halloran, T. L., Schmidt, A., Hanson, C. V., and Law, B. E.: Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the contiguous United States, version 1.0., Geosci. Model Dev.,7, 2477-2484, doi:10.5194/gmd-7-2477-2014, 2014.

Rivera-Monroy, V. H., E. Castaneda-Moya, J. G. Barr, V. Engel, J. D. Fuentes, T. G. Troxler, R. Twilley, S. Bouillon, T. J. Smith, and T. L.O'Halloran. Current methods to evaluate net primary production and carbon budgets in mangrove forests. In Methods in Biogeochemistry of Wetlands. 2013. ISBN-13: 978-0891189602. R.D. DeLaune, K.R. Reddy, C.J. Richardson, and J.P. Megonigal, eds.

J. G. Barr, J. D. Fuentes, M. S. DeLonge, T. L. O'Halloran, D. Barr, and J. C. Zieman. 2013. Influences of tidal energy advection on the surface energy balance in a mangrove forest. Biogeosciences, 10, 501-511

O'Halloran, T.L., Law, B.E., Wang, Z., Barr, J.G., Schaaf, C., Brown, M., Goulden, M.L., Fuentes, J.D., Göckede, M., Black, A., Engel, V. 2012. Radiative forcing of natural forest disturbances. Global Change Biology. 18, 555-565.

Goetz, S.J, Bond-Lamberty, B., Law, B., Hicke, J., McNulty, S., O'Halloran, T.L., Meddens, A.J.H., Pfeifer, E.M., Mildrexler, D., Kasischke, E. 2012. Observations and assessment of forest carbon dynamics following disturbance in North America. Journal of Geophysical Research, Biogeosciences. 117, G02022. doi:10.1029/2011JG001733

Shuman, J.K., Shugart, H.H., O'Halloran, T.L. 2011. Sensitivity of Siberian larch forests to climate change. Global Change Biology. 17, 2370-2384.

Barr, J. G., V. Engel, J. D. Fuentes, J. C. Zieman, T. L. O'Halloran, T.L., J. Smith III, and G. H. Anderson. 2010. Controls on mangrove forest-atmosphere carbon dioxide exchanges in western Everglades National Park, J. Geophys. Res., 115, G02020, doi:10.1029/2009JG001186.

Anderson, R.G., Canadell, J.G., Randerson, J.T., Jackson, R.B., Hungate, B.A., Baldocchi, D.D., Ban-Weiss, G.A., Bonan, G.B., Caldeira, K., Cao, L., Diffenbaugh, N.S., Gurney, K.R., Kueppers, L.M., Law, B.E., Luyssaert, S., O'Halloran, T.L. 2010. Biophysical considerations in forestry for climate protection. Frontiers in Ecology and the Environment. doi:10.1890/090179

O'Halloran, T.L., Fuentes, J.D., Collins, D.R., Cleveland, M.J., and Keene, W.C. Influence of air mass source region on nanoparticle events and hygroscopicity in central Virginia, U.S. 2009. Atmospheric Environment, 43, 3586-3595.

Keene, W.C., Long, M.S., Pszenny, A.A.P., Sander, R., Maben, J.R., Wall, A.J., O'Halloran, T.L., Kerkweg, A., Fischer, E.V., and Schrems, O. 2009. Latitudinal variation in the multiphase chemical processing of inorganic halogens and related species over the eastern North and South Atlantic Oceans, Atmospheric Chemistry and Physics, 9, 7361-7385.


O'Halloran Lab website
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College of Agriculture, Forestry and Life Sciences
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