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Dissolved major and trace geochemical dynamics in Antarctic lacustrine systems

KL. Lecomte, PA. Vignoni, CV. Echegoyen, P. Santolaya, K. Kopalová, TJ. Kohler, M. Roman, SH. Coria, JM. Lirio,

. 2020 ; 240 (-) : 124938. [pub] 20190923

Jazyk angličtina Země Velká Británie

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc20005840

Clearwater Mesa (James Ross Island, northeast Antarctic Peninsula) provides a unique opportunity to study solute dynamics and geochemical weathering in the pristine lacustrine systems of a high latitude environment. In order to determine major controls on the solute composition of these habitats, a geochemical survey was conducted on 35 lakes. Differences between lakes were observed based on measured physico-chemical parameters, revealing neutral to alkaline waters with total dissolved solids (TDS) < 2500 mg L-1. Katerina and Trinidad-Tatana systems showed an increase in their respective TDS, total organic carbon values, and finner sediments from external to internal lakes, indicating an accumulation of solutes due to weathering. Norma and Florencia systems exhibited the most diluted and circumneutral waters, likely from the influence of glacier and snow melt. Finally, isolated lakes presented large variability in TDS values, indicating weathering and meltwater contributions at different proportions. Trace metal abundances revealed a volcanic mineral weathering source, except for Pb and Zn, which could potentially indicate atmospheric inputs. Geochemical modelling was also conducted on a subset of connected lakes to gain greater insight into processes determining solute composition, resulting in the weathering of salts, carbonates and silicates with the corresponding generation of clays. We found CO2 consumption accounted for 20-30% of the total species involved in weathering reactions. These observations allow insights into naturally occurring geochemical processes in a pristine environment, while also providing baseline data for future research assessing the impacts of anthropogenic pollution and the effects of climate change.

Citace poskytuje Crossref.org

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$a Lecomte, Karina L $u Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET/Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina; Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina. Electronic address: karina.lecomte@unc.edu.ar.
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$a Dissolved major and trace geochemical dynamics in Antarctic lacustrine systems / $c KL. Lecomte, PA. Vignoni, CV. Echegoyen, P. Santolaya, K. Kopalová, TJ. Kohler, M. Roman, SH. Coria, JM. Lirio,
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$a Clearwater Mesa (James Ross Island, northeast Antarctic Peninsula) provides a unique opportunity to study solute dynamics and geochemical weathering in the pristine lacustrine systems of a high latitude environment. In order to determine major controls on the solute composition of these habitats, a geochemical survey was conducted on 35 lakes. Differences between lakes were observed based on measured physico-chemical parameters, revealing neutral to alkaline waters with total dissolved solids (TDS) < 2500 mg L-1. Katerina and Trinidad-Tatana systems showed an increase in their respective TDS, total organic carbon values, and finner sediments from external to internal lakes, indicating an accumulation of solutes due to weathering. Norma and Florencia systems exhibited the most diluted and circumneutral waters, likely from the influence of glacier and snow melt. Finally, isolated lakes presented large variability in TDS values, indicating weathering and meltwater contributions at different proportions. Trace metal abundances revealed a volcanic mineral weathering source, except for Pb and Zn, which could potentially indicate atmospheric inputs. Geochemical modelling was also conducted on a subset of connected lakes to gain greater insight into processes determining solute composition, resulting in the weathering of salts, carbonates and silicates with the corresponding generation of clays. We found CO2 consumption accounted for 20-30% of the total species involved in weathering reactions. These observations allow insights into naturally occurring geochemical processes in a pristine environment, while also providing baseline data for future research assessing the impacts of anthropogenic pollution and the effects of climate change.
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$a Vignoni, Paula A $u Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina; Institute of Geosciences, Potsdam University, Karl-Liebknecht-Straße. 24-25, 14476, Potsdam-Golm, Germany; Climate Dynamics and Landscape Evolution, German Research Centre for Geoscience GFZ, Telegrafenberg, 14473, Potsdam, Germany. Electronic address: pauvignoni@uni-potsdam.de.
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$a Echegoyen, Cecilia V $u Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET/Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina. Electronic address: cvechegoyen@hotmail.com.
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$a Santolaya, Pia $u Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina. Electronic address: mpiasantolaya@gmail.com.
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$a Kopalová, Kateřina $u Department of Ecology, Faculty of Science, Charles University, Viničná 7, 128 44, Praha 2, Czech Republic. Electronic address: katerina.kopalova@natur.cuni.cz.
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$a Kohler, Tyler J $u Department of Ecology, Faculty of Science, Charles University, Viničná 7, 128 44, Praha 2, Czech Republic; Current Address: Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland. Electronic address: tyler.j.kohler@gmail.com.
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$a Roman, Matěj $u Department of Geography, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic. Electronic address: matej.roman@gmail.com.
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$a Coria, Silvia H $u Instituto Antártico Argentino, 25 de Mayo 1143, San Martín, Prov. Buenos Aires, Argentina. Electronic address: silviahcoria@gmail.com.
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$a Lirio, Juan M $u Instituto Antártico Argentino, 25 de Mayo 1143, San Martín, Prov. Buenos Aires, Argentina. Electronic address: liriojm@gmail.com.
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