What question did this study set out to answer?

Determine the amplitude and frequency of directional paleomagnetic secular variation over the past 15,000 years while minimizing signal attenuation and lock-in uncertainties.

June 1, 2023Journal of Geophysical Research Solid EarthOpen Access

The Amplitude and Timescales of 0–15 ka Paleomagnetic Secular Variation in the Northern North Atlantic

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Authors

BRBrendan T. ReillyLamont-Doherty Earth Observatory JSJoseph S. StonerOregon State University SÓSædís ÓlafsdóttirReykjavík Energy (Iceland)

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Overview

Sediment core analysis reveals high-amplitude paleomagnetic secular variation across 0–15 ka, suggesting rapid geodynamo fluctuations at centennial timescales.

Key Points

Determine the amplitude and frequency of directional paleomagnetic secular variation over the past 15,000 years while minimizing signal attenuation and lock-in uncertainties.
Analyzed five ultra-high-resolution continental shelf sediment cores deposited at rates exceeding 1 m/kyr from the Northern North Atlantic (~67°N).
Constrained chronology using 103 radiocarbon dates, with marine reservoir ages assessed via tephra correlation to terrestrial archives.
Applied an objective alignment algorithm to evaluate signal reproducibility and construct a stacked paleomagnetic record (GREENICE15k) spanning the Bølling–Allerød and Younger Dryas transitions.
Demonstrated a reproducible paleomagnetic secular variation signal with well-constrained amplitudes preserved through abrupt late Pleistocene climate transitions.
Identified significantly greater directional variance and higher amplitudes at sub-millennial and centennial timescales than predicted by time-varying spherical harmonic models and European varve records.

Cite This Study

Reilly et al. (2023) studied this question.

synapsesocial.com/papers/6a8429fcac510c864ff2fc84 https://doi.org/10.1029/2023jb026891

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June 1, 2023Journal of Geophysical Research Solid EarthOpen Access

The Amplitude and Timescales of 0–15 ka Paleomagnetic Secular Variation in the Northern North Atlantic

View Full Paper

Ask AI

Bookmark

Authors

BRBrendan T. ReillyLamont-Doherty Earth Observatory JSJoseph S. StonerOregon State University SÓSædís ÓlafsdóttirReykjavík Energy (Iceland)

Discussion

Member takes

Overview

Sediment core analysis reveals high-amplitude paleomagnetic secular variation across 0–15 ka, suggesting rapid geodynamo fluctuations at centennial timescales.

Key Points

Determine the amplitude and frequency of directional paleomagnetic secular variation over the past 15,000 years while minimizing signal attenuation and lock-in uncertainties.
Analyzed five ultra-high-resolution continental shelf sediment cores deposited at rates exceeding 1 m/kyr from the Northern North Atlantic (~67°N).
Constrained chronology using 103 radiocarbon dates, with marine reservoir ages assessed via tephra correlation to terrestrial archives.
Applied an objective alignment algorithm to evaluate signal reproducibility and construct a stacked paleomagnetic record (GREENICE15k) spanning the Bølling–Allerød and Younger Dryas transitions.
Demonstrated a reproducible paleomagnetic secular variation signal with well-constrained amplitudes preserved through abrupt late Pleistocene climate transitions.
Identified significantly greater directional variance and higher amplitudes at sub-millennial and centennial timescales than predicted by time-varying spherical harmonic models and European varve records.

Cite This Study

Reilly et al. (2023) studied this question.

synapsesocial.com/papers/6a8429fcac510c864ff2fc84 https://doi.org/10.1029/2023jb026891

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