Carbon dioxide and carbon monoxide photoproduction quantum yields in the Delaware Estuary |
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| Authors: | Emily M White David J Kieber Jane Sherrard William L Miller Kenneth Mopper |
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| Institution: | 1. College of Marine and Environmental Sciences, Tianjin University of Science and Technology, 29 13th Avenue, TEDA, Tianjin 300457, PR China;2. Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, Rimouski, Québec G5L 3A1, Canada;1. University of Helsinki, P.O. Box 65, Viikinkaari 1, FI-00014 Helsinki, Finland;2. University of Jyväskylä, Department of Biological and Environmental Science, 40500 Jyväskylä, Finland;3. Technical University of Denmark, National Institute of Aquatic Resources, Kavalergården 6, 2920 Charlottenlund, Denmark;4. Norwegian Polar Institute, Fram Centre, NO-9296 Tromsø, Norway;5. University of Technology Sydney, Broadway, Sydney, New South Wales 2001, Australia;6. School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey LL59 5AB, UK;7. School of Biological Sciences, University of Essex, CO4 3SQ Colchester, UK;8. Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany;9. Finnish Environment Institute (SYKE), Marine Research Centre, P.O. Box 140, 00251 Helsinki, Finland;10. Arctic Centre, Aarhus University, DK-8000 Aarhus C, Denmark;1. Old Dominion University, Department of Chemistry and Biochemistry, 4402 Elkhorn Ave., Norfolk, VA 23529, United States;2. Skidaway Institute of Oceanography, 10 Ocean Science Circle, Savannah, GA 31411, United States;3. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States |
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| Abstract: | Photochemical mineralization of dissolved organic matter (DOM) plays an important role in the cycling of carbon in estuarine systems. A key to modeling this process is knowledge of apparent quantum yields (AQYs) for the photochemical products. Here we determined spectral AQYs for carbon dioxide (CO2) and carbon monoxide (CO), the main products of DOM photomineralization, along the main axis of the Delaware Estuary. Apparent quantum yields for CO2 photoproduction were determined shipboard using a multi-spectral irradiation system. Carbon monoxide AQYs were determined in stored samples by employing a narrow band spectral irradiation system. A single AQY spectrum described carbon dioxide photochemical production within the estuary whereas CO AQY spectra varied with salinity, suggesting different precursors and mechanisms for the production of these two species. CO2 AQYs were used along with shipboard measurements of DOM absorbance and solar irradiance to calculate photoproduction rates. Calculated CO2 photoproduction rates agreed with directly measured rates (2 to 4 μM CO2 d? 1) within experimental error, supporting the further development and use of AQYs to calculate regional-scale photochemical fluxes. |
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