19 Dec 2022
19 Dec 2022
Status: this preprint is currently under review for the journal CP.

Evaluating the 11-year solar cycle and short-term 10Be deposition events with novel excess water samples from the EGRIP project

Chiara I. Paleari1, Florian Mekhaldi1,2, Tobias Erhardt3,4, Minjie Zheng1,5, Marcus Christl6, Florian Adolphi4,7, Maria Hörhold4, and Raimund Muscheler1 Chiara I. Paleari et al.
  • 1Department of Geology, Lund University, Lund, Sweden
  • 2British Antarctic Survey, Ice Dynamics and Paleoclimate, Cambridge, UK
  • 3Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
  • 4Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 5Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland
  • 6Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland
  • 7Dept. of Geosciences, Bremen University, Bremen, Germany

Abstract. 10Be is produced by the interaction between galactic cosmic rays (GCR) and solar energetic particles (SEP) with the Earth’s atmospheric constituents. The flux of GCR is modulated by the varying strength of the magnetic fields of the Earth and the Sun. Measurement of 10Be concentrations from polar ice cores is thus a valuable tool to reconstruct the variations of the geomagnetic field and solar activity levels. The interpretation of 10Be records is, however, complicated by non-production related effects on the 10Be deposition rate caused by climate/weather induced noise. Furthermore, volcanic eruptions have been proposed to lead to short-term 10Be deposition enhancements. In this study, we test the use of excess meltwater from continuous flow analysis (CFA) to measure 10Be, allowing less time-consuming and more cost-effective sample preparation. We compare two records obtained from CFA and discrete samples from the EGRIP S6 firn core, reaching back to 1900 CE. We find that the two records agree well and that the 10Be record from CFA samples agrees as well as the discrete samples with other records from Greenland. Furthermore, by subtracting the theoretically expected GCR-induced signal, we investigate the high-frequency variability of the 10Be records from Greenland and Antarctica after 1951 CE, with focus on SEP events and volcanic eruptions. Finally, we use the 10Be records from Greenland and Antarctica to study the 11-year solar cycles, allowing us to assess the suitability of the CFA samples for the reconstruction of solar activity. This result opens new opportunities for the collection of continuous 10Be records with less time-consuming sample preparation while saving an important portion of the ice cores for other measurements.

Chiara I. Paleari et al.

Status: open (until 15 Mar 2023)

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  • RC1: 'Comment on cp-2022-94', Anonymous Referee #1, 16 Jan 2023 reply

Chiara I. Paleari et al.

Chiara I. Paleari et al.


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Short summary
In this study we test the use of excess meltwater from continuous flow analysis from a firn core from Greenland for the measurement of 10Be for solar activity reconstructions. We show that the quality of results is similar to the measurements on clean firn which opens the possibility to obtain continuous 10Be records without requiring large amounts of clean ice. Furthermore, we investigate the possibility to identify solar storm signals in 10Be records from Greenland and Antarctica.