Journal cover Journal topic
Earth System Science Data The Data Publishing Journal
Earth Syst. Sci. Data, 10, 139-149, 2018
https://doi.org/10.5194/essd-10-139-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
24 Jan 2018
Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance
István Gábor Hatvani1, Zoltán Kern1, Szabolcs Leél-Őssy2, and Attila Demény1 1Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Budaörsi út 45, 1112, Hungary
2Eötvös Loránd University, Department of Physical and Applied Geology, Budapest, Pázmány Péter stny. 1/C, 1117, Hungary
Abstract. 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 https://doi.org/10.1594/PANGAEA.875917.

Citation: Hatvani, I. G., Kern, Z., Leél-Őssy, S., and Demény, A.: Speleothem stable isotope records for east-central Europe: resampling sedimentary proxy records to obtain evenly spaced time series with spectral guidance, Earth Syst. Sci. Data, 10, 139-149, https://doi.org/10.5194/essd-10-139-2018, 2018.
Download
Short summary
Evenly spaced carbon and oxygen stable isotope records were produced from central European stalagmites. To mitigate the potential bias of interpolation, the variance spectra were carefully evaluated. The derived data are ready to use with conventional uni- and multivariate statistics, which are usually not prepared to handle the general characteristic of sedimentary paleoclimate records derived from geological sequences unevenly sampled in time.
Evenly spaced carbon and oxygen stable isotope records were produced from central European...
Share