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*Student Mentee, #Equal contributions

In Press

  • #Sutherland, K.M., Johnston, D.T., Hemingway, J.D., Wankel, S.D., and #Ward, C.P. Revised Microbial and Photochemical Triple-Oxygen Isotope Effects Improve Marine Gross Oxygen Production Estimates. In Press at PNAS Nexus.
  • *Walsh, A.N., Mazzotta, M., Nelson, T.F., Reddy, C.M., and Ward, C.P. Synergy between Sunlight, Titanium Dioxide, and Microbes Enhances Cellulose Diacetate Degradation in the Ocean. In Press at Environmental Science & Technology.


  • James, B.D., de Vos, A., Aluwihare, L., Youngs, S., Ward, C.P., Nelson, R.K., Michel, A.P.M., Hahm, M.E., and Reddy C.M. Divergent Forms of Pyroplastic: Lessons Learned from the M/V X-Press Pearl Ship Fire. ACS Environmental AU. 2, 5, 467-479
  • Koehler, B., Powers, L.C., Cory, R.M., Einarsdóttir, K., Gu, Y. Tranvik, L.J., Vähätalo, A.V., Ward, C.P., Miller, W.L. Inter-laboratory differences in the apparent quantum yield for the photochemical production of dissolved inorganic carbon in inland waters, and implications for photochemical rate modeling. Limnology & Oceanography: Methods. 20, 6, 320-337.
  • Berger, C.A., Ward, C.P., Karchner, S. I., Nelson, R.K., Reddy, C.M., Hahn, M.E., Tarrant, A.M. 2022. Nematostella vectensis exhibits an enhanced molecular stress response upon co-exposure to weathered oil and UV radiation. Marine Environmental Research. 175, 105569.
  • *Freeman, D.H. & Ward, C.P. Sunlight-driven dissolution is a major fate of oil at sea. Science Advances. 8, eabl7605.
  • *#Mazzotta, M.G., Reddy, C.M., & #Ward, C.P. Rapid Degradation of Cellulose Diacetate by Marine Microbes. Environmental Science & Technology Letters. 9, 1, 37-41.
  • de Vos, A., Aluwihare, L., Youngs, S., DiBenedetto, M., Ward, C.P., Michel, A., Colson, B., *Mazzotta, M., *Walsh, A., Nelson, R., Reddy, C., & James, B. 2021. The M/V X-Press Pearl nurdle spill: Contamination of burnt and unburnt nurdles along Sri Lanka’s beaches. ACS Environmental AU. 2, 2, 128–135.


  • *Walsh, A.N., Reddy, C.M., Niles, S.F., McKenna, A.M., Hansel, C.M., & Ward, C.P. Plastic Formulation is an Emerging Control of its Photochemical Fate in the Ocean. Environmental Science and Technology. 55, 18, 12383-12392.
  • *#Nelson, T.F., Reddy, C. M., and Ward, C. P. Product Formulation Controls the Impact of Biofouling on Consumer Plastic Photochemical Fate in the Ocean.  Environmental Science and Technology. 55, 13, 8898-8907.
  • Ward, C.P., *Bowen, J.C., *Freeman, D.H, and Sharpless, C.M. Rapid and Reproducible Characterization of the Wavelength Dependence of Aquatic Photochemical Reactions Using Light Emitting Diodes. 2021. Environmental Science & Technology Letters. 8, 437-442.
  • Xu, L., Roberts, M., Elder, K., Kurz, M., McNichol, A., Reddy, C., Ward, C.P., *Hanke, U. Radiocarbon in dissolved organic carbon by UV oxidation: procedures and blank characterization at NOSAMS. 2021. Radiocarbon. 63, 357-374.


  • *Nalven, S.G., Ward, C.P., Payet, J.P., Cory, R.M., Kling, G.W., Sharpton, T.J., Sullivan, C.M., & Crump, B.C. Experimental metatranscriptomics reveals the costs and benefits of dissolved organic matter photo-alteration for freshwater microbes. 2020. Environmental Microbiology. 22, 3505-3521
  • Ward, C.P. & ­Reddy, C.M. We need better data about the environmental persistence of plastic goods. 2020. Proceedings of the National Academies of Sciences. 26, 14618-14621.
  • Ward, C.P., Reddy, C.M., Overton, E.B. Why sunlight matters for marine oil spills. 2020. EOS, 101.
  • #Ward, C.P. & #Overton, E.B. How the 2010 Deepwater Horizon spill reshaped our understanding of crude oil photochemical weathering at sea: a past, present, and future perspective. 2020. Environmental Sciences: Processes & Impacts. 22, 1125-1138.
  • #Ward, C. P. & #Cory, R. M. Assessing the prevalence, products, and pathways of dissolved organic matter partial photochemical oxidation in arctic surface waters. 2020. Environmental Sciences: Processes & Impacts. 22, 1214-1223.


  • Ward, C.P., Armstrong, C.J., *Walsh, A.N., *Jackson, J.J. & Reddy, C.M. Sunlight converts polystyrene into carbon dioxide and dissolved organic carbon. 2019. Environmental Science & Technology Letters, 6, 669-674.
  • Ward, C.P., Sharpless, C.M., Valentine, D.L., Aeppli, C., *Sutherland, K.M., Wankel, S.D. & Reddy, C.M. Oxygen isotopes (δ18O) trace photochemical hydrocarbon oxidation at the sea surface. 2019. Geophysical Research Letters, 12, 6745-6754.


  • Gibson, C., Hatton, P.J., Bird, J., Nadelhoffer, K., Ward, C.P., Stark, R. and Filley, T., 2018. Interacting Controls of Pyrolysis Temperature and Plant Taxa on the Degradability of PyOM in Fire-Prone Northern Temperate Forest Soil. Soil Systems2(3).
  • Aeppli, C., Swarthout, R., O’Neil, G., Katz, S., Ward, C.P., Nelson, R., Sharpless, C., & Reddy, C.M. How persistent and bioavailable are oxygenated Deepwater Horizon oil transformation products? 2018. Environmental Science & Technology, 52, 7250-7258
  • Collins, J. R., Fredricks, H. F., Diaz, J. M., Bowman, J. S., Ward, C. P., Moreno, C. M., Longnecker, K., Marchetti, A., Hansel, C. M., Ducklow, H. W., & Van Mooy, B. A. S. The diverse products and biogeochemical significance of lipid photooxidation in coastal surface waters of West Antarctica. 2018. Geochimica et Cosmochimica Acta, 232, 244-264.
  • Ward, C. P., *Armstrong, C. J., Conmy, R. N., French-McCay, D. P., & Reddy, C. M. Photochemical Oxidation of Oil Reduced the Effectiveness of Aerial Dispersants Applied in Response to the Deepwater Horizon Spill. Environmental Science & Technology Letters, 5, 226-231.
  • Ward, C.P., Sharpless, C.M., Aeppli, C., French-McCay, D.P., Valentine, D.L., Rodgers, R. P., Gosselin, K.M., Nelson, R.K., & Reddy, C.M. Partial photochemical oxidation was a dominant fate of Deepwater Horizon surface oil. 2018. Environmental Science & Technology, 52 (4), 1797-1805.


  • Ward, C. P., Nalven, S.G., Crump, B. C., Kling, G. W., & Cory, R. M. Photochemical alteration of dissolved organic carbon draining permafrost soils shifts microbial metabolic pathways and stimulates respiration. 2017. Nature Communications, 8, 1-8.
  • Ward, C. P. & Cory, R. M. Complete and partial photo-oxidation of dissolved organic matter draining permafrost soils. 2016. Environmental Science & Technology, 50, 3545-3553.
  • Ward, C. P. & Cory, R. M. Chemical composition of dissolved organic matter draining permafrost soils. 2015. Geochemica et Cosmochimica Acta, 167, 63-79.
  • Cory, R. M., Ward, C. P., Crump, B. C., & Kling, G. W. Sunlight controls water column processing of carbon in arctic fresh waters. 2014. Science, 345, 925-928.
  • Ward, C. P., Sleighter, R. L., Hatcher, P. G., & Cory, R. M. Insights into the complete and partial photooxidation of black carbon in surface waters. 2014. Environmental Science: Processes & Impacts, 16, 721-731.
  • Hakala, J. A., Fimmen, R. L., Chin, Y. P., Agrawal, S. G., & Ward, C. P. Assessment of the geochemical reactivity of Fe-DOM complexes in wetland sediment pore waters using a nitroaromatic probe compound. 2014. Geochimica et Cosmochimica Acta, 73, 1382-1393.