Methods and codes for reservoir–atmosphere C-14 age offset calculations
Citable URI
https://hdl.handle.net/1912/7508As published
https://doi.org/10.1016/j.quageo.2015.05.023Keyword
Reservoir age; Reservoir effect; Dead carbon fraction; Radiocarbon modelling; Calibration curve; Uncalibration processAbstract
Reservoir age 14C offsets are invaluable tracers for past changes in carbon cycle and oceanic circulation. Reconstruction of reservoir age offsets with time is also required for calibration purposes (reconstruction of atmospheric calibration curve, calibration of non-atmospheric radiocarbon ages). Thus, properly propagating the various uncertainties linked to reservoir age offset is important for proper interpretation. However, approaches for reservoir age offset calculation – especially when considering pairs of reservoir-derived 14C and calendar ages – are usually not detailed and inadequate for proper propagation of uncertainties. Here, the various ways to properly calculate reservoir age offsets are described with an emphasis on a new approach when considering pairs of 14C and calendar ages. This approach maps the calendar age distribution onto the 14C time scale prior to reservoir age offset calculation – the “uncalibration-convolution process”. R codes computing reservoir age offsets based on available data are presented. Finally, a case study focusing on the reconstruction of the speleothem-atmosphere 14C age offsets of speleothem 14C data used in the latest release of the atmospheric calibration curve is discussed.
Description
Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Quaternary Geochronology 29 (2015): 97-103, doi:10.1016/j.quageo.2015.05.023.
Collections
Suggested Citation
Preprint: Soulet, Guillaume, "Methods and codes for reservoir–atmosphere C-14 age offset calculations", 2015-02, https://doi.org/10.1016/j.quageo.2015.05.023, https://hdl.handle.net/1912/7508Related items
Showing items related by title, author, creator and subject.
-
A new perspective for assessing water transport and associated retention effects in a large reservoir
Xu, Bochao; Yang, Disong; Yao, Peng; Burnett, William C.; Ran, Xiangbin; Charette, Matthew A.; Huang, Xinying; Liu, Sumei; Yu, Zhigang (John Wiley & Sons, 2018-09-23)Radioactive tracer techniques may be useful for assessing water transport and the overall effects of concurrent biogeochemical processes in river‐reservoir systems. In this study, we show that radium isotopes can assess ... -
Flow rate and source reservoir identification from airborne chemical sampling of the uncontrolled Elgin platform gas release
Lee, James D.; Mobbs, Stephen D.; Wellpott, Axel; Allen, Grant; Bauguitte, Stephane J.-B.; Burton, Ralph R.; Camilli, Richard; Coe, Hugh; Fisher, Rebecca E.; France, James L.; Gallagher, Martin; Hopkins, James R.; Lanoiselle, Mathias; Lewis, Alastair C.; Lowry, David; Nisbet, Euan G.; Purvis, Ruth M.; O'Shea, Sebastian; Pyle, John A.; Ryerson, Thomas B. (Copernicus Publications on behalf of the European Geosciences Union, 2018-03-27)An uncontrolled gas leak from 25 March to 16 May 2012 led to evacuation of the Total Elgin wellhead and neighbouring drilling and production platforms in the UK North Sea. Initially the atmospheric flow rate of leaking gas ... -
Archie's saturation exponent for natural gas hydrate in coarse‐grained reservoirs
Cook, Ann E.; Waite, William F. (John Wiley & Sons, 2018-02-17)Accurately quantifying the amount of naturally occurring gas hydrate in marine and permafrost environments is important for assessing its resource potential and understanding the role of gas hydrate in the global carbon ...