Resumen de Revealing climatic cycles in unevenly sampled stratigraphic sequences: the Lomb-Scargle peridogram
Eulogio Pardo Igúzquiza, Francisco Javier Rodríguez Tovar
Spectral analysis is the most usual mathematical technique applied to evidence cyclic climatic changes from the sedimentary record. Different spectral analysis techniques are used, mainly working on data at equal intervals. However, frequently uneven sampling is obtained, and other approaches must be applied. The Long-Scargle periodogram is presented as a useful technique to reveal cyclic climatic changes when working with time series at uneven sampling intervals. When dealing with the cross-spectrum between two sequences, the Lomb-Scargle coherence and phase spectrum has been implemented for studying the relation between the two successions. High-resolution palaeoceanographic dynamic associated to cyclic climatic changes could be approaches even when dealing with uneven sampling.
