Revealing climatic cycles in unevenly sampled stratigraphic sequences: the Lomb-Scargle peridogram

Eulogio Pardo-Iguzquiza ^[1] ; Francisco J. Rodríguez-Tovar ^[2]
1. [1] Instituto Geológico y Minero de España
  
  Instituto Geológico y Minero de España
  
  Madrid, España
2. [2] Universidad de Granada
  
  Universidad de Granada
  
  Granada, España
Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 11, 2010 (Ejemplar dedicado a: Deep-Water Circulation: Processes & Products. International Congress. Baitona, Pontevedra, Spain. 16 & 17 June 2010), págs. 133-134
Idioma: inglés
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Resumen
- 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.