Geological CO2 quantified by high-temporal resolution stable isotope monitoring in a salt mine
Open Access
- 26 November 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Scientific Reports
- Vol. 10 (1), 1-9
- https://doi.org/10.1038/s41598-020-77635-5
Abstract
The relevance of CO2 emissions from geological sources to the atmospheric carbon budget is becoming increasingly recognized. Although geogenic gas migration along faults and in volcanic zones is generally well studied, short-term dynamics of diffusive geogenic CO2 emissions are mostly unknown. While geogenic CO2 is considered a challenging threat for underground mining operations, mines provide an extraordinary opportunity to observe geogenic degassing and dynamics close to its source. Stable carbon isotope monitoring of CO2 allows partitioning geogenic from anthropogenic contributions. High temporal-resolution enables the recognition of temporal and interdependent dynamics, easily missed by discrete sampling. Here, data is presented from an active underground salt mine in central Germany, collected on-site utilizing a field-deployed laser isotope spectrometer. Throughout the 34-day measurement period, total CO2 concentrations varied between 805 ppmV (5th percentile) and 1370 ppmV (95th percentile). With a 400-ppm atmospheric background concentration, an isotope mixing model allows the separation of geogenic (16–27%) from highly dynamic anthropogenic combustion-related contributions (21–54%). The geogenic fraction is inversely correlated to established CO2 concentrations that were driven by anthropogenic CO2 emissions within the mine. The described approach is applicable to other environments, including different types of underground mines, natural caves, and soils.Funding Information
- Bundesministerium für Bildung und Forschung (03G0873B)
- Projekt DEAL
This publication has 52 references indexed in Scilit:
- Deep Carbon Emissions from VolcanoesReviews in Mineralogy and Geochemistry, 2013
- The extreme carbon dioxide outburst at the Menzengraben potash mine 7 July 1953Safety Science, 2012
- Natural laboratory NW Bohemia: Comprehensive fluid studies between 1992 and 2005 used to trace geodynamic processesGeochemistry, Geophysics, Geosystems, 2008
- Carbon dioxide Earth degassing and seismogenesis in central and southern ItalyGeophysical Research Letters, 2004
- Temporal variations of atmospheric CO2 concentration in a temperate deciduous forest in central JapanTellus B: Chemical and Physical Meteorology, 2003
- The application and interpretation of Keeling plots in terrestrial carbon cycle researchGlobal Biogeochemical Cycles, 2003
- Petrogenesis of Basanitic to Tholeiitic Volcanic Rocks from the Miocene Vogelsberg, Central GermanyJournal of Petrology, 2003
- Carbon degassing from the lithosphereGlobal and Planetary Change, 2002
- Geochemische und 13C/12C‐isotopenchemische Untersuchung zur Herkunft der Kohlensäure in mineralhaltigen Wässern Nordhessens (Deutschland)Acta Hydrochimica et Hydrobiologica, 1997
- Partialling out the Spatial Component of Ecological VariationEcology, 1992