Aquatic Sciences Meeting, Albuquerque 2001

SS02 Photochemical Reactions In Surface Waters: A Major Issue in the 21st Century? (Environmental Connections)

Date: Friday, February 16, 2001, Time: 9:00:00 AM

Location: San Miguel

Ziolkowski, L, A, Dalhousie University, Halifax, Canada, lziolkow@is2.dal.ca

Miller, W, L, Dalhousie University, Halifax, Canada, millerwl@is.dal.ca

Xie, H, , Woods Hole Oceanographic Institute, Woods Hole, USA, hxie@whoi.edu

Zafiriou, O, C, Woods Hole Oceanographic Institute, Woods Hole, USA, ozafiriou@whoi.edu

Efficiency Spectra for the Marine Photochemical Production of Carbon Monoxide Determined using a Solar Simulator

The photochemical efficiency (apparent quantum yield, AQY) of the marine production of carbon monoxide (CO) was determined at sea for a number of fresh marine samples. Using a solar simulator, samples were exposed under a series of optical filters that eliminated defined radiation. A statistical fit that uses measured CO production, irradiance and spectral absorbance data allowed the calculation of a complete AQY spectrum with a defined mathematical shape from each irradiation experiment (4 hours). AQY spectra determined in this manner for samples ranging from high carbon coastal waters to low carbon blue waters are very similar in both shape and magnitude. AQY spectra determined using our multispectral method compare well with AQY points determined using a monochromatic light system at a blue water station. The utility of the AQY spectra generated at sea was also examined by comparing calculated in situ production to CO measurements obtained from day-long deployments of optical moorings.

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Aquatic Sciences Meeting, Albuquerque 2001

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