Principal Investigator, Senior Scientist
Phone
443-482-2285 Research Labs
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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(2009). Bio-optical characteristics and remote sensing in the mid Chesapeake Bay through intergration of observations and radiative transfer closure. Remote Sensing and Geospatial Technologies for Coastal Ecosystem Assessment and Management (139-168) Springer .
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(2008). Response of Antarctic phytoplankton to solar UVR exposure: inhibition and recovery of photosynthesis in coastal and pelagic assemblages. Marine Ecology Progress Series, 365 (1) , 1-16. http://dx.doi.org/10.3354/meps07610
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(2008). 2003 North American interagency intercomparison of ultraviolet spectroradiometers: scanning and spectrograph instruments. Journal of Applied Remote Sensing, 2 (1) , Art. no. 023547. http://dx.doi.org/10.1117/1.3040299
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(2008). Ultraviolet Light. Encyclopedia of Inland Waters v.2 (705-714) Elsevier .
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(2007). Symposium In Print: UV Effects in Aquatic and Terrestrial Environments: Introduction . Photochemistry and photobiology, 83 (4) , 775-776. http://dx.doi.org/10.1111/j.1751-1097.2007.00176.x
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(2007). Remote Sensing Reflectance and Inherent Optical Properties in the mesohaline Chesapeake Bay. Estuarine Coastal and Shelf Science, 72 , 16-32.
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(2007). Photobleaching of dissolved organic material from a tidal marsh-estuarine system of the Chesapeake Bay . Photochemistry and photobiology, 83 (4) , 782-792. http://dx.doi.org/10.1111/j.1751-1097.2007.00142.x
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(2006). Sublethal exposure to UV radiation affects respiration rates of the freshwater cladoceran Daphnia catawba . Photochemistry and photobiology, 82 , 547-550.
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(2006). Bio-optics of the Chesapeake Bay from measurements and radiative transfer closure. Estuarine, Coastal and Shelf Science, 68 , 348-362.
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(2005). UV effects on photosynthesis, growth and acclimation of an estuarine diatom and cryptomonad . Marine Ecology Progress Series, 300 , 53-62.
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(2005). Smithsonian-NIST-USDA-FPL Network for Monitoring Solar Ultraviolet Irradiance:: comparison of radiometer measurements and radiative transfer model calculations. Service Life Prediction: Challenging the Status Quo. Proceedings of the 3rd International Symposium on Service Life Prediction (159-170) Federation of Societies for Coatings Technology .
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(2005). Photochemical production of hydrogen peroxide and methylhydroperoxide in coastal waters . Marine Chemistry, 97 , 14-33.
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(2004). UVA variability overrules UVB ozone hole depletion on the photoreduction of iron in the Souther Ocean . Geophysical Research Letters, 31 , L24310, doi.
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(2003). Phytoplankton productivity by Williams, Thomas and Reynolds. Newsletter, International Association of Theoretical and Applied Limnology, 38 , 8.
