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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(2001). Quantifying the response of phytoplankton photosynthesis to ultraviolet radiation: biological weighting functions versus in situ measurements in two Swiss lakes . Aquatic Sciences, 63 , 265-285.
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(2001). Beneficial and detrimental effects of UV on aquatic organisms: Implications of spectral variation . Ecological Applications, 11 , 1843-1857.
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(2000). Development and intercalibration of ultraviolet solar actinometers . Photochemistry and photobiology, 71 , 431-440.
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(2000). Spectral weighting functions for quantifying the effects of ultraviolet radiation in marine ecosystems. Effects of UV radiation on marine ecosystems (73-100) Cambridge University Press .
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(2000). Assessing biological and chemical effects of UV in the marine environment: spectral weighting functions. Causes and environmental implications of increased UV-B radiation (61-83) Royal Society of Chemistry .
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(2000). Phytoplankton pigments at the Weddell-Scotia confluence during the 1993 austral spring . Journal of Plankton Research, 22 (10) , 1989-2006.
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(2000). Mechanisms of UV damage to aquatic organisms. Effects of UV radiation on marine ecosystems (149-176) Cambridge University Press .
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(1999). Application of spectral weighting functions in assessing the effects of environmental UV radiation. Service life predition of organic coatings: a systems approach (45-55) American Chemical Society .
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(1998). Ultraviolet sunscreens in Gymnodinium sanguineum (dinophyceae): mycosporine-like amino acids protect against inhibition of photosynthesis . Journal of Phycology, 34 (6) , 928-938.
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(1998). Inhibition of marine photosynthesis by ultraviolet radiation: Variable sensitivity of phytoplankton in the Weddell-Scotia Confluence during the austral spring . Limnology and Oceanography, 43 (3) , 433-448.
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(1998). Interactive effects of ozone depletion and vertical mixing on photosynthesis of Antarctic phytoplankton . Nature, 392 (6676) , 585-589.
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(1997). Impacts of solar UVR on aquatic microorganisms. Photochemistry and photobiology, 65 , 252-269.
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(1997). 1994 North American interagency intercomparison of ultraviolet monitoring spectroradiometers . Journal of Research of the National Institute of Standards and Technology, 102 (3) , 279-322.
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(1996). Record low ozone at Mauna Loa Observatory during winter 1994-1995: A consequence of chemical and dynamical synergism?. Geophysical Research Letters, 23 (12) , 1533-1536.
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(1996). Acclimation of Antarctic phytoplankton to ultraviolet radiation: ultraviolet-absorbing compounds and carbon fixation. Molecular marine biology and biotechnology, 5 (4) , 314-325.
