Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance
Uneven spacing is a common feature of sedimentary paleoclimate records, in many cases causing difficulties in the application of classical statistical and time series methods. Although special statistical tools do exist to assess unevenly spaced data directly, the transformation of such data into...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-01-01
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| Series: | Earth System Science Data |
| Online Access: | https://www.earth-syst-sci-data.net/10/139/2018/essd-10-139-2018.pdf |
| _version_ | 1818110473145417728 |
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| author | I. G. Hatvani Z. Kern S. Leél-Őssy A. Demény |
| author_facet | I. G. Hatvani Z. Kern S. Leél-Őssy A. Demény |
| author_sort | I. G. Hatvani |
| collection | DOAJ |
| description | Uneven spacing is a common feature of sedimentary paleoclimate records, in
many cases causing difficulties in the application of classical statistical
and time series methods. Although special statistical tools do exist to
assess unevenly spaced data directly, the transformation of such data into a
temporally equidistant time series which may then be examined using commonly
employed statistical tools remains, however, an unachieved goal. The present
paper, therefore, introduces an approach to obtain evenly spaced time series
(using cubic spline fitting) from unevenly spaced speleothem records with the
application of a spectral guidance to avoid the spectral bias caused by
interpolation and retain the original spectral characteristics of the data.
The methodology was applied to stable carbon and oxygen isotope records
derived from two stalagmites from the Baradla Cave (NE Hungary) dating back
to the late 18th century. To show the benefit of the equally spaced records
to climate studies, their coherence with climate parameters is explored using
wavelet transform coherence and discussed. The obtained equally spaced time
series are available at <a href="https://doi.org/10.1594/PANGAEA.875917" target="_blank">https://doi.org/10.1594/PANGAEA.875917</a>. |
| first_indexed | 2024-12-11T02:47:42Z |
| format | Article |
| id | doaj.art-ce3b9d64eaf940d7b3f82db11ef7c3b9 |
| institution | Directory Open Access Journal |
| issn | 1866-3508 1866-3516 |
| language | English |
| last_indexed | 2024-12-11T02:47:42Z |
| publishDate | 2018-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Earth System Science Data |
| spelling | doaj.art-ce3b9d64eaf940d7b3f82db11ef7c3b92022-12-22T01:23:24ZengCopernicus PublicationsEarth System Science Data1866-35081866-35162018-01-011013914910.5194/essd-10-139-2018Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidanceI. G. Hatvani0Z. Kern1S. Leél-Őssy2A. Demény3Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Budaörsi út 45, 1112, HungaryInstitute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Budaörsi út 45, 1112, HungaryEötvös Loránd University, Department of Physical and Applied Geology, Budapest, Pázmány Péter stny. 1/C, 1117, HungaryInstitute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Budaörsi út 45, 1112, HungaryUneven spacing is a common feature of sedimentary paleoclimate records, in many cases causing difficulties in the application of classical statistical and time series methods. Although special statistical tools do exist to assess unevenly spaced data directly, the transformation of such data into a temporally equidistant time series which may then be examined using commonly employed statistical tools remains, however, an unachieved goal. The present paper, therefore, introduces an approach to obtain evenly spaced time series (using cubic spline fitting) from unevenly spaced speleothem records with the application of a spectral guidance to avoid the spectral bias caused by interpolation and retain the original spectral characteristics of the data. The methodology was applied to stable carbon and oxygen isotope records derived from two stalagmites from the Baradla Cave (NE Hungary) dating back to the late 18th century. To show the benefit of the equally spaced records to climate studies, their coherence with climate parameters is explored using wavelet transform coherence and discussed. The obtained equally spaced time series are available at <a href="https://doi.org/10.1594/PANGAEA.875917" target="_blank">https://doi.org/10.1594/PANGAEA.875917</a>.https://www.earth-syst-sci-data.net/10/139/2018/essd-10-139-2018.pdf |
| spellingShingle | I. G. Hatvani Z. Kern S. Leél-Őssy A. Demény Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance Earth System Science Data |
| title | Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance |
| title_full | Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance |
| title_fullStr | Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance |
| title_full_unstemmed | Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance |
| title_short | Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance |
| title_sort | speleothem stable isotope records for east central europe resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance |
| url | https://www.earth-syst-sci-data.net/10/139/2018/essd-10-139-2018.pdf |
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