Small catchment scale Mo isotope balance and its implications for global Mo isotope cycling

Nägler, Thomas; Pierret, Marie-Claire; Vögelin, Andrea; Pettke, Thomas; Aschwanden, Lukas; Villa, Igor Maria (2020). Small catchment scale Mo isotope balance and its implications for global Mo isotope cycling. In: Dontsova, Katerina; Balogh-Brunstad, Zsuzsanna; Le Roux, Gaël (eds.) Biogeochemical Cycles: Ecological Drivers and Environmental Impact. Geophysical Monograph Series: Vol. 251 (pp. 163-189). American Geophysical Union 10.1002/9781119413332.ch8

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The mass balance of molybdenum (Mo) was studied in the Strengbach catchment. Monitoring of rainfall, vegetation, and soil characteristics in this 0.8 km2 catchment was started decades ago. We present Mo concentrations and isotope compositions of about 60 samples including bedrock types, perennial springs, soil profiles, roots and leaves, and the outflowing brook. Both stream waters and bedrocks have Mo concentrations at least one order of magnitude lower than global averages. The Mo isotope composition of topsoils, foliage, litter, and roots is rather homogeneous. Net biological fractionation is thus subordinate to differences in the Mo sources. Efficient Mo recycling from organic litter to plants keeps Mo bioavailable. The Mo and Sr isotope data, are used to identify the source(s) of Mo and Sr and their (transient) storage within the catchment. The resulting best model identifies rock weathering and seawater derived aerosol as the principal Mo sources. Moreover, soil in the Strengbach catchment has reached steady state for Mo (the time constant to achieve soil steady state is calculated to be in in the order of 50 years) where the Mo isotope compositions of fluxes to and from the catchments soil are identical.

Item Type:

Book Section (Book Chapter)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Rock-Water Interaction

UniBE Contributor:

Nägler, Thomas; Vögelin, Andrea; Pettke, Thomas; Aschwanden, Lukas and Villa, Igor Maria

Subjects:

500 Science > 550 Earth sciences & geology

ISBN:

978-1-119-41330-1

Series:

Geophysical Monograph Series

Publisher:

American Geophysical Union

Funders:

[UNSPECIFIED] Swiss National Science Foundation Grant: 200021_126759 ; [UNSPECIFIED] CNRS/INSU France and Université de Strasbourg

Language:

English

Submitter:

Thomas Nägler-Jenni

Date Deposited:

19 Sep 2019 15:14

Last Modified:

10 Mar 2021 13:53

Publisher DOI:

10.1002/9781119413332.ch8

BORIS DOI:

10.7892/boris.131863

URI:

https://boris.unibe.ch/id/eprint/131863

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