Article (Scientific journals)
Identification of a periodic time series from an environmental proxy record
de Brauwere, A.; De Ridder, F.; Pintelon, R. et al.
2008In Computers and Geosciences, 34 (12), p. 1781-1790
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Keywords :
Accretion rate; Biogenic calcite; Environmental archives; Growth rate; Proxy; Time series; Time series analysis; Monte Carlo analysis; Anthozoa; Bivalvia
Abstract :
[en] The past environment is often reconstructed by measuring a certain proxy (e.g. δ18O) in an environmental archive, i.e. a species that gradually accumulates mass and records the current environment during this mass formation (e.g. corals, shells, trees, etc.). When such an environmental proxy is measured, its values are known on a distance grid. However, to relate the data to environmental variations, the date associated with each measurement has to be known too. This transformation from distance to time is not straightforward to solve, since species usually do not grow at constant or known rates. In this paper, we investigate this problem for environmental archives exhibiting a certain periodicity. In practice, the method will be applicable to most annually resolved archives because these contain a seasonal component, e.g. clams, corals, sediment cores or trees. Due to variations in accretion rate the data along the distance axis have a disturbed periodic profile. In this paper, a method is developed to extract information about the accretion rate, such that the original (periodic, but further unknown) signal as a function of time can be recovered. The final methodology is quasi-independent of choices made by the investigator and is designed to deliver the most precise and accurate result. Every step in the procedure is described in detail, the results are tested on a Monte-Carlo simulation, and finally the method is exemplified on a real world example. © 2008 Elsevier Ltd. All rights reserved.
Disciplines :
Earth sciences & physical geography
Author, co-author :
de Brauwere, A.;  Department of Environmental and Analytical Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
De Ridder, F.;  Department of Environmental and Analytical Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium, Department of Fundamental Electricity and Instrumentation, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
Pintelon, R.;  Department of Fundamental Electricity and Instrumentation, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
Meersmans, Jeroen ;  Université de Liège - ULiège > Département GxABT > Analyse des risques environnementaux
Schoukens, J.;  Department of Fundamental Electricity and Instrumentation, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
Dehairs, F.;  Department of Environmental and Analytical Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
Language :
English
Title :
Identification of a periodic time series from an environmental proxy record
Publication date :
2008
Journal title :
Computers and Geosciences
ISSN :
0098-3004
Publisher :
Elsevier, United Kingdom
Volume :
34
Issue :
12
Pages :
1781-1790
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Flemish Government [BE]
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE]
VUB - Vrije Universiteit Brussel [BE]
Funding text :
IUAP V/22; HOA9
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