Preprints
https://doi.org/10.5194/tc-2020-342
https://doi.org/10.5194/tc-2020-342

  05 Jan 2021

05 Jan 2021

Review status: this preprint is currently under review for the journal TC.

Reconstruction of annual accumulation rate on firn synchronizing H2O2 concentration data with an estimated temperature record

Jandyr M. Travassos1, Saulo S. Martins2, Mariusz Potocki4,5, and Jefferson C. Simões3,4 Jandyr M. Travassos et al.
  • 1Graduate Program in Geophysics, Universidade Federal do Pará (UFPA), Rua Augusto Corrêa n. 01, Belém, Pará, Brazil
  • 2Graduate Program in Geology, Universidade Federal Rural do Rio de Janeiro (UFRRJ). BR-465 Km 7, Seropédica, Brazil
  • 3Centro Polar e Climatico, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
  • 4Climate Change Institute, University of Maine, Orono, USA
  • 5School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, USA

Abstract. This work deals with two distinct datasets, a well preserved H2O2 concentration data from firn cores at a high deposition location and a temperature time series, estimated from the daily records from four Antarctic stations around the Antarctic Peninsula. With them we have produced a time scale, an ice–core chronology, for the 133  deep borehole DP-07-1 from Plateau Detroit, Antarctic Peninsula. We constructed the chronology through a non-linear pairing transformation of the two series, based entirely on mathematical optimization, compensating the peroxide frequency scaling, reflecting the gradual thinning of the annual firn layers with depth. We resorted to a dynamic time warping algorithm to find an optimal alignment between the two data series, allowing for the thinning of the annual firn layers with depth and the estimation of their original thicknesses at time of deposition. The core chronology spanning from Jan-1980 to Dec-2010 for the borehole reach, a time frame of a mere 30 years period, revealing a fairly stable 11 year average for the accumulation rate of 2.5 m w.e./y.

Jandyr M. Travassos et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2020-342', Anonymous Referee #1, 11 Mar 2021
    • AC1: 'Reply on RC1', Saulo Martins, 10 Apr 2021
  • RC2: 'Comment on tc-2020-342', Anonymous Referee #2, 15 Mar 2021
    • AC2: 'Reply on RC2', Saulo Martins, 16 Apr 2021

Jandyr M. Travassos et al.

Jandyr M. Travassos et al.

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Short summary
Time scale estimation and the accumulation rate on a yearly basis, from ice-cores encompassing the entire firn layer at Plateau Detroit, Antarctic Peninsula. Through a non-linear pairing transformation of a high-resolution H2O2 concentration data to a local temperature time series, estimated from recordings of Antarctic stations around the Peninsula. An 11-year moving average of the yearly ice accumulation rate may suggest an increase in the span of 30-year, with an average of 2.5–2.8 m w.e./y.