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Application of a Spectral Estimation System for the Determination of Cyclicities on Continental sediments

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Dutch title: Spectraal analyse systeem voor cycliciteitsbepalingen op continentale sedimenten
Reference no: P101/1932311190
Period: 1993

Thesaurus terms: Climate prediction; Geochronology; Isotopes; Palaeoclimate; Sediments

Institutes (3)  Top 
  • Vrije Universiteit Brussel; Faculteit Wetenschappen; Vakgroep Geologie (VUB), more
  • Vrije Universiteit Brussel; Faculteit Ingenieurswetenschappen; Vakgroep Algemene Elektriciteit en Instrumentatie (ELEC), more
  • Vrije Universiteit Brussel; Faculteit Wetenschappen; Vakgroep Geologie (VUB), more, sponsor

Periodicallly changing recurrences in sediment properties of geological deposits such as grain size, structure, geochemical content, etc. have lead to the recognition of cycles enduced by climatic changes. As from 1950, the development of radiometric,geochronologic and palaeomagnetic methods created the possibility to fix these cycles in time and to apply them on sediments of only 3 Ma (million year) old such as deepsea mud and the icecaps, in which geochemic isotopes, such as oxygen and carbon isotopes were time-evolutionary determined. Both these isotopes are directly linked up with the changes in carbon concentration of the atmosphere. Correlation of the results were made with the continental sediments, especially with the fossil soils they contain and which occur with a cyclicity of 100 Ka (kiloyears), 40 Ka and 20 Ka. These cycles coincide very well with the astronomical cycles calculated on base of the solar radiation. The "ExSpect" computer programme elaborated by ELEC and applied on continental cycles by TOGE is aimed to determine the continental cyclicities with very narrow accuracy, to improve the error callibration and approximative calculation in order to be able to obtain also from continental sediment series thrustable data for extrapolation of the climate change calculations towards the very near future and to be able to predict in this way many of the natural hazards attacking mankind.

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