Principal Investigator, Senior Scientist
Research Labs
Phone
443-482-2285
Staff Profile
Biography
Research Interests
I study the effects of sunlight, especially ultraviolet radiation, on ecosystems and the environment. I mainly work in freshwater and marine systems focusing on the responses of the smallest organisms in those systems, the plankton. A long term project has been studying the effects of increased UV-B due to Antarctic ozone depletion on the productivity of the Southern Ocean which surrounds the Antarctic continent. I also supervise the SI solar-radiation monitoring program which has been measuring UV-B radiation in Maryland since the 1970s compiling one of the longest records of spectral irradiance in the world.
Publications
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(2020). Environmental effects of stratospheric ozone depletion, UV radiation and interactions with climate change: UNEP Environmental Effects Assessment Panel, update 2019. Photochemical & Photobiological Sciences, 19 (5) , 542-584. https://doi.org/10.1039/d0pp90011g
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(2020). Correction to: A mechanistic model of photochemical transformation and degradation of colored dissolved organic matter (vol 214, 103666, 2019). Marine Chemistry, 225 , 103852-103852. https://doi.org/10.1016/j.marchem.2020.103852
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(2019). Ozone depletion, ultraviolet radiation, climate change and prospects for a sustainable future . Nature Sustainability, 2 (7) , 569-579. https://doi.org/10.1038/s41893-019-0314-2
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(2019). A mechanistic model of photochemical transformation and degradation of colored dissolved organic matter . Marine Chemistry, 214 , Article 103666. https://doi.org/10.1016/j.marchem.2019.103666
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(2019). Are warmer waters, brighter waters?. Aquatic Ecosystems in a Changing Climate (89-115) CRC Press .
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(2019). Patterns of spectral, spatial, and long-term variability in light attenuation in an optically complex sub-estuary: Trends in sub-estuary light attenuation . Limnology and Oceanography, 64 (S1) , S257-S272. https://doi.org/10.1002/lno.11005
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(2019). The interactive effects of stratospheric ozone depletion, UV radiation, and climate change on aquatic ecosystems . Photochemical & Photobiological Sciences: Official Journal of the European Photochemistry Association and the European Society for Photobiology, 18 , 717-746. https://doi.org/10.1039/c8pp90062k
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(2018). Environmental effects of ozone depletion, UV radiation and interactions with climate change: UNEP Environmental Effects Assessment Panel, update 2017. Photochemical & Photobiological Sciences: Official Journal of the European Photochemistry Association and the European Society for Photobiology, 17 , 127-179. https://doi.org/10.1039/c7pp90043k
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(2018). Wind-Driven Dissolved Organic Matter Dynamics in a Chesapeake Bay Tidal Marsh-Estuary System . Estuaries and Coasts, 41 (3) , 780-723. https://doi.org/10.1007/s12237-017-0295-1
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(2017). Inhibition by Ultraviolet and Photosynthetically Available Radiation Lowers Model Estimates of Depth-Integrated Picophytoplankton Photosynthesis: Global Predictions for Prochlorococcus and Synechococcus. Global Change Biology, 23 (1) , 293-306. https://doi.org/10.1111/gcb.13356
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(2017). Temporal variability in the importance of hydrologic, biotic, and climatic descriptors of dissolved oxygen dynamics in a shallow tidal-marsh creek. Water Resources Research, 53 (8) , 7103-7120. https://doi.org/10.1002/2016WR020196
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(2017). Quantifying phytoplankton productivity and photoinhibition in the Ross Sea Polynya with large eddy simulation of Langmuir circulation. Journal of Geophysical Research: Oceans, 122 (7) , 5545-5565. https://doi.org/10.1002/2017JC012747
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(2017). Watershed influences on the structure and function of riparian wetlands associated with headwater streams – Kenai Peninsula, Alaska . Science of The Total Environment, 599–600 , 124-134. https://doi.org/10.1016/j.scitotenv.2017.03.290
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(2016). Solar Irradiance Changes and Phytoplankton Productivity in Earth's Ocean Following Astrophysical Ionizing Radiation Events. Astrobiology, 16 (4) , 245-258. https://doi.org/10.1089/ast.2015.1360
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(2016). Sentinel responses to droughts, wildfires, and floods: effects of UV radiation on lakes and their ecosystem services. Frontiers in Ecology and the Environment, 14 (2) , 102-109. https://doi.org/10.1002/fee.1228
