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Implications of riv...
Implications of river intrusion and convective mixing on the spatial and temporal variability of under-ice CO2
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- Pasche, Natacha (author)
- Limnology Center, EPFL-ENT-LIMNC, Lausanne, Switzerland; Physics of Aquatic Systems Laboratory, Margaretha Kamprad Chair, EPFL-ENAC-IEE-APHYS, Lausanne, Switzerland
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- Hofmann, Hilmar (author)
- Environmental Physics Group, University of Konstanz - Limnological Institute, Konstanz, Germany
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- Bouffard, Damien (author)
- Physics of Aquatic Systems Laboratory, Margaretha Kamprad Chair, EPFL-ENAC-IEE-APHYS, Lausanne, Switzerland; Eawag,Swiss Federal Institute of Aquatic Science and Technology, Department of Surface Waters-Research and Management, Kastanienbaum,Switzerland
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- Schubert, Carsten J. (author)
- Eawag,Swiss Federal Institute of Aquatic Science and Technology, Department of Surface Waters-Research and Management, Kastanienbaum, Switzerland
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- Lozovik, Petr A. (author)
- Northern Water Problems Institute, Karelian Research Center, Russian Academy of Sciences, Petrozavodsk, Russia
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- Sobek, Sebastian (author)
- Uppsala universitet,Limnologi
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(creator_code:org_t)
- 2019-04-30
- 2019
- English.
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In: Inland Waters. - : Informa UK Limited. - 2044-2041 .- 2044-205X. ; 9:2, s. 162-176
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Abstract
Subject headings
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- Ice-covered periods might significantly contribute to lake emissions at ice-melt, yet a comprehensive understanding of under-ice carbon dioxide (CO2) dynamics is still lacking. This study investigated the processes driving spatiotemporal patterns of under-ice CO2 in large Lake Onego. In March 2015 and 2016, under-ice CO2, dissolved inorganic carbon (DIC), and dissolved organic carbon (DOC) distributions were measured along a river to an open-lake transect. CO2 decreased from 120/129 μmol L−1 in the river to 51/98 μmol L−1 in the bay, and 34/36 μmol L−1 in the open lake, while DOC decreased from 1.18/1.55 mmol L−1 in the river to 0.67/1.04 mmol L−1 in the bay in 2015 and 2016, respectively. These decreases in concentrations with increasing distance from the river mouth indicate that river discharge modulates spatial patterns of under-ice CO2. The variability between the 2 years was mainly driven by river discharge and ice transparency affecting the extent of under-ice convection. Higher discharge during winter 2016 resulted in higher CO2 concentrations in the bay. By contrast, intensive under-ice convection led to lower, more homogeneously distributed CO2 in 2015. In conclusion, the river-to-bay transition zone is characterized by strong CO2 variability and is therefore an important zone to consider when assessing the CO2 budget of large lakes.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Keyword
- carbon dioxide
- convective mixing
- humic lake
- river intrusion
- spatial distribution
- under-ice
Publication and Content Type
- ref (subject category)
- art (subject category)
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