Petrogenic organic carbon retention in terrestrial basins: a case study from perialpine Lake Constance

Blattmann, T. M., Wessels, M., McIntyre, C. P. and Eglinton, T. I. (2019) Petrogenic organic carbon retention in terrestrial basins: a case study from perialpine Lake Constance. Chemical Geology, 503, pp. 52-60. (doi: 10.1016/j.chemgeo.2018.10.021)

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Inland waters play a major role in the global carbon cycle, with particulate organic carbon (POC) burial in terrestrial wetlands surpassing that in ocean sediments. Lake Constance, the second largest lake at the periphery of the European Alps, receives POC sourced from both aquatic and terrestrial productivity as well as petrogenic OC (OCpetro) from bedrock erosion. Distinguishing POC inputs to lake sediments is key to assessing carbon flux and fate as reworked OCpetro represents neither a net sink of atmospheric CO2 nor source of O2. New stable and radiocarbon isotopic data indicate that 11 (9–12) Gg/yr of OCpetro is buried in Lake Constance with underlying sediments on average containing 0.3 (0.25–0.33) wt% OCpetro. Extrapolation of these results suggests that 27 TgOCpetro/yr (12–54 TgOC/yr) could be subject to temporary geological storage in lakes globally, which is comparable to estimates of 43−25+61 TgOCpetro/yr delivered to the ocean by rivers (Galy et al., 2015). More studies are needed to quantify OCpetro burial in inland sedimentary reservoirs in order to accurately account for atmospheric carbon sequestration in terrestrial basins.

Item Type:Articles
Additional Information:This project was funded by the Swiss National Science Foundation (“CAPS-LOCK”; #200021_140850) and ETH Zürich (Research Grant ETH-41 14-1).
Glasgow Author(s) Enlighten ID:Mcintyre, Dr Cameron
Authors: Blattmann, T. M., Wessels, M., McIntyre, C. P., and Eglinton, T. I.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Chemical Geology
ISSN (Online):1872-6836
Published Online:24 October 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Chemical Geology 503:52-60
Publisher Policy:Reproduced under a Creative Commons License

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