Using dynamic time warping to align geochemical proxy records

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http://abstractsearch.agu.org/meetings/2018/FM/PP21D-1439.html
Author(s): Ajayi, Seyi; Kump, Lee Robert
Author Affiliation(s): Primary:
Pennsylvania State University, University Park, PA, United States
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Variations in sedimentation rate, bioturbation, and dissolution create gaps and distortions in the sedimentary record, establishing a convoluted relationship between depth and time of a geochemical proxy. Dynamic time warping (DTW), a signal processing method used in speech recognition, is used in this study to better understand convoluted records by aligning these records with more complete records spanning the same time period at different locations. DTW was applied to bulk sediment carbonate isotope records (δ13C) from ODP Sites 1262, 1263, 1265 and 690 records spanning the Paleocene-Eocene Thermal Maximum (PETM). First, δ13C records for Walvis Ridge sites 1262 and 1265 were aligned to the more complete site 1263 record. The alignments were found to be similar to existing published alignments based on correlating breaks and inflections in the isotope record by hand. The δ13C record from Maud Rise Site 690 was then aligned to Site 1263. This alignment shows a previously unidentified gap in Site 690, indicating that the CIE did not reach its minimum value. These preliminary results indicate that DTW may provide an objective way to align isotope records, identify gaps and distortions, and together with astrochronology and geochronology, lead to a more complete understanding of the geologic record of biospheric events in deep time. [1] Rohl, U., Westerhold, T., Bralower, T. J., & Zachos, J. C. (2007). On the duration of the Paleocene-Eocene thermal maximum (PETM). Geochemistry, Geophysics, Geosystems, 8(12). [2] Zachos, J. C., Rohl, U., Schellenberg, S. A., Sluijs, A., Hodell, D. A., Kelly, D. C., & McCarren, H. (2005). Rapid acidification of the ocean during the Paleocene-Eocene thermal maximum. Science, 308(5728), 1611-1615.
Year of Publication: 2018
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; Atlantic Ocean; Chemical composition; Geochemistry; Leg 113; Leg 208; Maud Rise; ODP Site 1262; ODP Site 1263; ODP Site 1265; ODP Site 690; Ocean Drilling Program; South Atlantic; Southern Ocean; Walvis Ridge; Weddell Sea
Coordinates: S271100 S271100 E0013500 E0013400
S283200 S283200 E0024700 E0024700
S650938 S650937 E0011218 E0011218
Record ID: 2019040226
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