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Noble-gas and fluid transport processes in lake sediments

Titel Englisch Noble-gas and fluid transport processes in lake sediments
Gesuchsteller/in Kipfer Rolf
Nummer 132155
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Eawag
Hochschule Eidg. Anstalt für Wasserversorgung, Abwasserreinigung und Gewässerschutz - EAWAG
Hauptdisziplin Hydrologie, Limnologie, Glaziologie
Beginn/Ende 01.09.2011 - 31.08.2015
Bewilligter Betrag 276'085.00
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Alle Disziplinen (6)

Disziplin
Hydrologie, Limnologie, Glaziologie
Ozeanographie
Andere Gebiete der Physik
Andere Gebiete der Umweltwissenschaften
Geophysik
Geochemie

Keywords (4)

noble gases; sediments; pore water; solute transport

Lay Summary (Englisch)

Lead
Lay summary

Recently experimental techniques for the sampling and analysis of dissolved noble gases in the pore water of lake sediments were developed. First applications of these methods indicate that dissolved noble gases in sediment pore water are promising proxies for (palaeo) environmental conditions in lakes and in the ocean, and for the transport of solutes in the sediment and their release into the overlying water body and into the atmosphere.

The key conclusion of all these studies is that in some sediments the diffusivity of noble gases in the sediment pore water is similar to their molecular diffusivity in bulk water. In other sediments, however, noble gases are quantitatively trapped in the sediment and diffusion is therefore strongly suppressed. This trapping results in a stratigraphically controlled noble-gas record in the sediment, which allows a time scale to be associated with the noble gas record in the pore water. However, the mechanisms resulting in this noble-gas trapping remain to be identified. A mechanistic understanding of the diffusion suppression is required to establish the conceptual basis needed for future applications of noble gases as proxies for environmental conditions and transport of pore fluids.

The aims of the PhD research project proposed here are (i) to improve the mechanistic understanding of how and why noble gases are trapped in some sediments, but not in others (work packages A and B) and (ii) to apply the methods and concepts established in our previous projects in a study targeted at specific geological and environmental questions in a Swiss lake (work package C):

A. Study of microscopic pore-space geometry in relation to diffusion suppression: We aim to study the microscopic pore-space geometry of different sediments to identify the mechanisms that result in noble-gas trapping in the sediment.

B. Quantification of the effective diffusivities of noble-gas isotopes: We aim to measure the effective noble-gas diffusivities in different sediments to quantify the extent of the diffusion suppression.

C. Investigation of the dynamics and origin of CH4-rich fluids in the sediment of Lake Lungern (Switzerland): the sediments of Lake Lungern contain large amounts of CH4-rich fluids. We aim to use noble-gas isotopes as proxies for the transport and origin of these fluids, which may also be associated with the formation of distinct dome-like elevations (mounds) on the generally flat lake floor.

Based on these approaches, we aim to consolidate and further expand the uses of noble gas geochemistry as a widely applicable tool to study the transport of fluids and solutes in unconsolidated sediments, and to extend the area of application of noble-gas geochemistry in the environmental sciences.

Furthermore, knowledge of the transport properties of noble gases in relation to the characteristics of the sediment will allow targeted choices of the most suitable study sites for future research projects. Also, this work will be of direct benefit to other research not covered by the current project. For instance, interpretation of the noble-gas data that will be obtained from the deep-drilling sediment cores of Lake Van (Turkey) within the framework of the ICDP-PaeloVan project will benefit directly from the improved knowledge on noble-gas trans- port mechanisms in lake.

Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Publikationen

Publikation
Conquering the outdoors with on-site mass spectrometry
Mächler L., Brennwald M. S., Tyroller L., Livingstone D.M., Kipfer R. (2014), Conquering the outdoors with on-site mass spectrometry, in Chimia, 68, 155-159.
Fractionation of Ne and Ar isotopes by molecular diffusion in water
Tyroller L., Brennwald M. S., Mächler L., Livingstone D.M., Kipfer R. (2014), Fractionation of Ne and Ar isotopes by molecular diffusion in water, in Geochimica et Cosmochimica Acta, 136, 60-66.
Modification and implementation of a new method for CH4 analysis in lake sediment
Ndayisaba Cyprien (2013), Modification and implementation of a new method for CH4 analysis in lake sediment.

Zusammenarbeit

Gruppe / Person Land
Formen der Zusammenarbeit
Prof. Dr. D. McGinnis, Inst. Forel, University of Geneva Schweiz (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Forschungsinfrastrukturen
- Austausch von Mitarbeitern
COST Action - ES1201 Spanien (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Austausch von Mitarbeitern
Prof. Dr. J. Greiert, Dr. Ch. Hensen, Helmholtz-Zentrum für Ozeanforschung (GEOMAR) Deutschland (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Forschungsinfrastrukturen

Wissenschaftliche Veranstaltungen

Aktiver Beitrag

Titel Art des Beitrags Titel des Artikels oder Beitrages Datum Ort Beteiligte Personen
Goldschmidt conference 2015 (Theme 10 'Water' organized) Vortrag im Rahmen einer Tagung Noble gas isotope ratios as tracer for molecular diffusion in lake sediments 16.08.2015 Prague, Tschechische Republik Tyroller Lina; Kipfer Rolf;
Aquatic Sciences Meeting Vortrag im Rahmen einer Tagung Tracing bubbles with noble gases dissolved in the sediment pore water of two reservoirs: Lake Boadella, Spain and Lake Lungern, Switzerland 22.02.2015 Granada, Spanien Tyroller Lina;
7th IBP PhD Congress Poster Simultaneous measurement of noble gas and CH4 concentrations in the sediment porewater 01.04.2014 Zürich, Schweiz Tyroller Lina; Brennwald Matthias; Kipfer Rolf;
Ocean Sciences Meeting Poster Simultaneous measurement of noble gas and CH4 concentrations in the sediment porewater 01.02.2014 Honolulu, Vereinigte Staaten von Amerika Kipfer Rolf; Tyroller Lina; Brennwald Matthias;
NETLAKE Meeting Vortrag im Rahmen einer Tagung Application of a MIMS for high-frequency sampling of dissolved gases in aquatic systems, 01.01.2014 Girona, Spanien Tyroller Lina;
PERGAMON symposium Vortrag im Rahmen einer Tagung Effect of lake level variation on methane dynamics in the sediment of Lake Lungern, Switzerland 01.11.2013 Kiel, Deutschland Kipfer Rolf; Brennwald Matthias; Tyroller Lina;
Goldschmidt Conference 2013 Vortrag im Rahmen einer Tagung Linking Noble Gas and CH4 Concentrations in the Sediment Porewater of Lake Lungern, Switzerland 25.08.2013 Florenz, Italien Tyroller Lina; Kipfer Rolf; Brennwald Matthias;
EGU General Assembly April 2013 Vortrag im Rahmen einer Tagung Methane dynamics in supersaturated lake sediments 07.04.2013 Wien, Oesterreich Kipfer Rolf; Brennwald Matthias; Tyroller Lina;
IBP Congress April 2013 Vortrag im Rahmen einer Tagung Methane dynamics in supersaturated lake sediments 01.04.2013 Duebendorf, Schweiz Kipfer Rolf; Brennwald Matthias; Tyroller Lina;


Verbundene Projekte

Nummer Titel Start Förderungsinstrument
124981 The Swiss contribution to the Lake Van Drilling Project: 500000 years of environmental and climate change in Eastern Anatolia (Science Part) 01.01.2010 Projektförderung (Abt. I-III)
105263 Edelgase in Sedimenten als Indikatoren für Umweltveränderungen in Seen 01.10.2004 Projektförderung (Abt. I-III)
124972 The Swiss contribution to the Lake Van Drilling Project: 500000 years of environmental and climate change in Eastern Anatolia (Drilling Costs) 01.01.2010 Forschungsinfrastrukturen
160018 Lake sediment methane-bubble fluxes inferred from porewater noble gas profiles: A new modeling-measurement approach to reconstruct past and present C fluxes, C budgets and eutrophication 01.09.2015 Projektförderung (Abt. I-III)
162447 Noble gases trapped in the pore fluids of aquatic sediments as environmental tracers 01.10.2016 Projektförderung (Abt. I-III)
68191 Edelgase in Sedimenten als Indikation für Umweltveränderungen in Seen 01.10.2002 Projektförderung (Abt. I-III)
160114 Managing Lake Kivu: moving from a steady-state to a dynamic modelling approach 01.12.2015 Projektförderung (Abt. I-III)
121853 Towards noble gas analysis in ocean sediments to characterize active CH4 seepage 01.10.2008 Projektförderung (Abt. I-III)
109465 Noble gases as tracers for transport of solutes and fluids in lake sediments 01.10.2005 Projektförderung (Abt. I-III)
133790 A multibeam-bathymetric device to acquire high-resolution lake floor morphologic data 01.08.2011 R'EQUIP

Abstract

In the previous and the ongoing SNF projects, experimental techniques for the sampling and analysis of dissolved noble gases in the pore water of lake sediments were developed. First applications of these methods indicate that dissolved noble gases in sediment pore water are promising proxies for (palaeo)environmental conditions in lakes and in the ocean, and for the transport of solutes in the sediment and their release into the overlying water body and into the atmosphere.From a conceptual point of view, the key conclusion of all these studies is that in some sediments the diffusivity of noble gases in the sediment pore water is similar to their molecular diffusivity in bulk water. In other sediments, however, noble gases are quantitatively trapped in the sediment and diffusion is therefore strongly suppressed. This trapping results in a stratigraphically controlled noble-gas record in the sediment, which allows a time scale to be associated with the noble gas record in the pore water. However, the mechanisms resulting in this noble-gas trapping remain to be identified. A mechanistic understanding of the diffusion suppression is required to establish the conceptual basis needed for future applications of noble gases as proxies for environmental conditions and transport of pore fluids.The aims of the PhD research project proposed here are (i) to improve the mechanistic understanding of how and why noble gases are trapped in some sediments, but not in others (work packages A and B) and (ii) to apply the methods and concepts established in our previous projects in a study targeted at specific geological and environmental questions in a Swiss lake (work package C):A. Study of microscopic pore-space geometry in relation to diffusion suppression: We aim to study the microscopic pore-space geometry of different sediments to identify the mechanisms that result in noble-gas trapping in the sediment.B. Quantification of the effective diffusivities of noble-gas isotopes: We aim to measure the effective noble-gas diffusivities in different sediments to quantify the extent of the diffusion suppression.C. Investigation of the dynamics and origin of -rich fluids in the sediment of Lake Lungern (Switzerland): the sediments of Lake Lungern contain large amounts of -rich fluids. We aim to use noble-gas isotopes as proxies for the transport and origin of these fluids, which may also be associated with the formation of distinct dome-like elevations (mounds) on the generally flat lake floor.Based on these approaches, we aim to consolidate and further expand the uses of noble gas geochemistry as a widely applicable tool to study the transport of fluids and solutes in unconsolidated sediments, and to extend the area of application of noble-gas geochemistry in the environmental sciences.Furthermore, knowledge of the transport properties of noble gases in relation to the characteristics of the sediment will allow targeted choices of the most suitable study sites for future research projects. Also, this work will be of direct benefit to other research not covered by the current project. For instance, interpretation of the noble-gas data that will be obtained from the deep-drilling sediment cores of Lake Van (Turkey) within the framework of the ICDP-PaeloVan project will benefit directly from the improved knowledge on noble-gas transport mechanisms in lake sediments.
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