serac: an R package for ShortlivEd RAdionuclide chronology of recent sediment cores

Abstract

Lake Iseo-An example of a sediment sequence where the three sedimentation hypotheses could be tested. Varve counting is also available. .

A worldwide meta-analysis (1977–2020) of sediment core dating using fallout radionuclides including <sup>137</sup>Cs and <sup>210</sup>Pb<sub>xs</sub>

“…As metadata are required to extend the data life cycle and promote knowledge integration by the community, a minimum reporting guideline has been recently suggested for short-lived radionuclides (Bruel and Sabatier, 2020;Courtney Mustaphi et al, 2019). Among them, the sampling year is one of the most important, and it was reported in 92 % of publications.…”

“…The evolution of 210 Pb xs activities with depth in sediment cores follows an exponential decrease from which it is possible to calculate the sedimentation rates for the last 100-150 years. Several dating models were established in the literature in order to infer sediment ages from 210 Pb xs (Appleby and Oldfield, 1978;Bruel and Sabatier, 2020;Goldberg, 1963;Sanchez-Cabeza and Ruiz-Fernández, 2012), and several limitations to this method were also described (e.g., Binford, 1990). Sediment core inventories are often reported for both radionuclides to compare the study location with a reference site.…”

Evidence of Chlordecone Resurrection by Glyphosate in French West Indies

“…A chronological framework was established with the serac R package 40 from measurements of short-lived radionuclides, constrained by the identification of historical hurricane event deposits (Fig. 3, Table S2 and S3) as 137 Cs did not provide an interpretable profile in relation to its desorption/migration in marine sediments 41 .…”

“…The Fe/Ca data in the GUA17-01 and GAL17-04 cores led to the identification of 4 and 3 historical hurricane events, respectively, that caused heavy precipitation in the region, as indicated by meteorological data (http://pluiesextremes.meteo.fr/), which allow independent chronology validation. The sediment deposits triggered by these events were considered as instantaneous and thus excluded from the construction of the age model, by removing the depth interval and associated 210 Pbxs data of each of these deposits 40,42 . The logarithmic plot of the event corrected 210 Pbxs activity shows a general decrease, with two distinct linear trends (black and dark blue Fig.…”

“…3). According to the "constant flux, constant sedimentation rate" (CFCS) model 40 applied to each segment of the profile, the levels of 210 Pbxs indicate drastic increases in the sediment accumulation rate (SAR) from 3.9 ± 0.6 mm.y −1 to 43.3 ± 9.5 mm.y −1 and from 5.0 ± 0.2 mm.y −1 to 22.1 ± 5.1 mm.y −1 with synchronous changes in 2000 (uncertainty range: 1996-2005) and 1999 (uncertainty: 1995-2004) in the GUA17-01 and GAL17-04 cores, respectively (Fig. 3).…”