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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(2021). DOM degradation by light and microbes along the Yukon River-coastal ocean continuum. Scientific Reports, 11 (1) https://doi.org/10.1038/s41598-021-89327-9
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(2021). Photochemical and Microbial Degradation of Chromophoric Dissolved Organic Matter Exported From Tidal Marshes . Journal of Geophysical Research: Biogeosciences, 126 (4) https://doi.org/10.1029/2020JG005744
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(2021). Environmental effects of stratospheric ozone depletion, UV radiation, and interactions with climate change: UNEP Environmental Effects Assessment Panel, Update 2020. Photochemical & Photobiological Sciences, 20 , 1-67. https://doi.org/10.1007/s43630-020-00001-x
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(2021). Editorial: Climate Change and Light in Aquatic Ecosystems: Variability & Ecological Consequences. Frontiers in Marine Science, 8 https://doi.org/10.3389/fmars.2021.688712
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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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(2020). Annual solar spectral energy distributions in North America. Polymer Degradation and Stability, 182 , 109380-109380. https://doi.org/10.1016/j.polymdegradstab.2020.109380
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(2020). Dissolved organic carbon sorption dynamics in tidal marsh soils . Limnology and Oceanography, https://doi.org/10.1002/lno.11598
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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
