Diel behavior of stable isotopes of dissolved oxygen and dissolved inorganic carbon in rivers over a range of trophic conditions,and in a mesocosm experiment |
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| Authors: | Stephen R Parker Christopher H Gammons Simon R Poulson Michael D DeGrandpre Charmaine L Weyer M Garrett Smith John N Babcock Yasuhiro Oba |
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| Institution: | 1. Department of Chemistry and Geochemistry, Montana Tech of The University of Montana, 1300 W. Park St., Butte, MT 59701, USA;2. Dept. of Geological Engineering, Montana Tech of The University of Montana, Butte, MT 59701, USA;3. Dept. of Geological Sciences and Engineering, University of Nevada-Reno, Reno, NV 89557, USA;4. Dept. of Chemistry, The University of Montana, Missoula, MT 59812, USA;1. Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Straße 24, D-14476 Potsdam, Germany;2. GFZ German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Development, Telegrafenberg, D-14473 Potsdam, Germany;3. Institute of Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany;4. Institute of Geology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria;5. Stiftung Naturerbe Karst und Höhlen Obwalden (NeKO), Rosenrain 1, 6055 Alpnach, Switzerland;1. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Chikusa, Nagoya 464-8601, Japan;2. Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Aobayama, Sendai 980-8578, Japan;3. Department of Physics and Earth Sciences, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan;4. Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan;5. Hydrospheric-Atmospheric Science, Graduate School of Environmental Studies, Nagoya University, Chikusa, Nagoya 464-8601, Japan;6. Department of Chemical Oceanography, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan |
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| Abstract: | Rates of diel (24-h) biogeochemical processes in rivers and their effect on daily changes in the concentration of metals and metalloids have been well documented in the literature over the last 20 years. Investigations into the effects of these processes on aquatic systems and the underlying mechanisms that control the processes can significantly improve our understanding of how natural aquatic environments function and will respond to changing environmental conditions and anthropogenic impacts. Daily changes in the rates of biogeochemical processes have, more recently, been shown to influence the stable isotope composition of dissolved oxygen and dissolved inorganic carbon in natural waters. Here we present a comprehensive picture of the persistence and reproducibility of diel cycles of the 18O composition of dissolved molecular oxygen (δ18O-DO) and the 13C composition of dissolved inorganic carbon (δ13C-DIC) across five Montana, USA rivers investigated over a 4-year period. A mesocosm experiment showed the same behavior in δ18O-DO and δ13C-DIC as seen in riverine settings across light and dark periods.A cross plot of δ18O-DO and δ13C-DIC from each stream exhibits a clockwise elliptical pattern which is attributed to the daily changes in the balance of metabolic rates as well as air–water gas exchange. The amplitude of the change in the isotope composition is shown to be directly related to the trophic state of the river and a relationship between net productivity and diel changes in δ18O-DO and δ13C-DIC is presented. This relationship between trophic status with δ18O-DO, δ13C-DIC and production emphasizes the significance of how rates of biogeochemical processes in natural systems can influence the daily changes in the composition of surface waters. |
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