Preprints
https://doi.org/10.5194/egusphere-2023-2845
https://doi.org/10.5194/egusphere-2023-2845
15 Dec 2023
 | 15 Dec 2023

Revising chronological uncertainties in marine archives using global anthropogenic signals: a case study

Nil Irvalı, Ulysses S. Ninnemann, Are Olsen, Neil L. Rose, David J. R. Thornalley, Tor L. Mjell, and François Counillon

Abstract. Marine sediments are excellent archives for reconstructing past changes in climate and ocean circulation. Overlapping with instrumental records they hold the potential to elucidate natural variability and contextualize current changes. Yet, dating uncertainties of traditional approaches (e.g., up to ± 30–50 years, for the last two centuries) pose major challenges for integrating the shorter instrumental records with these extended marine archives. Hence, robust sediment chronologies are crucial and most existing age model constraints do not provide sufficient age control, particularly for the 20th century, which is the most critical period for comparing proxy records to historical changes. Here we propose a novel chronostratigraphic approach that uses anthropogenic signals such as the oceanic 13C Suess effect and spheroidal carbonaceous fly ash particles to reduce age model uncertainties in high-resolution marine archives. As a test, we apply this new approach to a marine sediment core located at the Gardar Drift, in the subpolar North Atlantic, and revise the previously published age model for this site. We further provide refined estimate of regional reservoir corrections and uncertainties for Gardar Drift.

Nil Irvalı, Ulysses S. Ninnemann, Are Olsen, Neil L. Rose, David J. R. Thornalley, Tor L. Mjell, and François Counillon

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2845', James David Scourse, 19 Jan 2024
    • AC1: 'Reply on RC1', Nil Irvali, 11 Apr 2024
  • RC2: 'Comment on egusphere-2023-2845', Anonymous Referee #2, 26 Feb 2024
    • AC2: 'Reply on RC2', Nil Irvali, 11 Apr 2024
  • RC3: 'Comment on egusphere-2023-2845', Anonymous Referee #3, 14 Mar 2024
    • AC3: 'Reply on RC3', Nil Irvali, 11 Apr 2024
Nil Irvalı, Ulysses S. Ninnemann, Are Olsen, Neil L. Rose, David J. R. Thornalley, Tor L. Mjell, and François Counillon
Nil Irvalı, Ulysses S. Ninnemann, Are Olsen, Neil L. Rose, David J. R. Thornalley, Tor L. Mjell, and François Counillon

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Short summary
Marine sediments are excellent archives for reconstructing past changes in climate and ocean circulation. Yet, dating uncertainties, particularly during the 20th century, pose major challenges. Here we propose a novel chronostratigraphic approach that uses anthropogenic signals, such as the oceanic 13C Suess effect and spheroidal carbonaceous fly ash particles, to reduce age model uncertainties in high-resolution marine archives over the 20th century.