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Dynamic time warping of palaeomagnetic secular variation data

TitleDynamic time warping of palaeomagnetic secular variation data
Publication TypeJournal Article
Year of Publication2020
AuthorsHagen C.J, Reilly B.T, Stoner J.S, Creveling J.R
Date Published2020/04
Type of ArticleArticle
ISBN Number0956-540X
Accession NumberWOS:000525947800049
Keywordsatlantic ocean; deep-sea sediments; excursions; Geochemistry & Geophysics; geomagnetic-field; holocene; iodp site u1305; magnetization; Magnetostratigraphy; Palaeomagnetic secular variation; Palaeomagnetism; radiocarbon; records; relative paleointensity; remanent; Statistical methods; variation psv

We present and make publicly available a dynamic programming algorithm to simultaneously align the inclination and declination vector directions of sedimentary palaeomagnetic secular variation data. This algorithm generates a library of possible alignments through the systematic variation of assumptions about the relative accumulation rate and shared temporal overlap of two or more time-series. The palaeomagnetist can then evaluate this library of reproducible and objective alignments using available geological constraints, statistical methods and expert knowledge. We apply the algorithm to align previously (visually) correlated medium to high accumulation rate northern North Atlantic Holocene deposits (10(1)-10(2) cm ka(-1)) with strong radiocarbon control. The algorithm generates plausible alignments that largely conform with radiocarbon and magnetic acquisition process uncertainty. These alignments illustrate the strengths and limitations of this numerical approach.

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