{"refrec":{"BRefID":32769,"RR":"<b>De Ridder, F.; Schoukens, J.; Pintelon, R.; Baeyens, W.F.J.; André, L.; Dehairs, F.A.</b> (2003). Non-linear growth rates of marine calcareous organisms and the problem of decoding the recorded environmental change signal, <b><i>in</i></b>: Mees, J. <i>et al.</i> <i>VLIZ Young Scientists' Day, Brugge, Belgium 28 February 2003: book of abstracts. VLIZ Special Publication,</i> 12: pp. 28-29","BEntID":32769,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":", <b><i>in</i></b>: Mees, J. <i>et al.</i> <i>VLIZ Young Scientists' Day, Brugge, Belgium 28 February 2003: book of abstracts. VLIZ Special Publication,</i> 12: pp. 28-29","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"De Ridder, F.; Schoukens, J.; Pintelon, R.; Baeyens, W.F.J.; André, L.; Dehairs, F.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"De Ridder, F. <i>et al.</i>","Englishabstract":"For specific biota the record of a feature (i.e. a proxy) along a growth axis can reflect (changing) environmental conditions experienced during lifetime of the organisms. To reconstruct the time base one has to assume a constant growth rate. This poster presents a method to avoid this assumption, which leads to a better matching between the proxy and the environmental conditions. In order to predict future climate changes accurately, a much longer retrospect needs to be considered compared to the directly measured meteorological and environmental data. Such long-term information is continuously recorded in many marine calcareous skeletons at various contrasted time resolutions. For example, the magnesium concentration in the modern bivalve <i>Isognomon ephippium</i> specimen is related to ambient environmental conditions, like temperature. Such a proxy was collected by David Gilliken<sup>2</sup> in Tudor Creek (Mombasa, Kenya) and analysed by Claire Lazareth (Lazareth et al.). It was attempted to partly reconstruct these environmental conditions by analysing the Mg-concentration along the growth axis. In a first attempt a constant growth rate of the shell was assumed. This led to a correlation between the Mg-concentration and the temperature of 65 %. However, a significant error is present, because of the changing growth rate during the lifetime of this bivalve. To overcome this problem we have estimated the non-linear growth rate based on methods used to characterize time base distortions in high frequency sampling scopes. Instead of assuming a linear growth rate, we have assumed that the Mg-profile is harmonic. Non-harmonically related frequencies are used to reconstruct the time base distortion. Finally, the corrected time base is used to match the Mg-concentration against temperature. This time, a correlation coefficient of 85 % is found. Annual and bi-annual variations in the Mg-concentrations can now be separated from the noise. In this specific case of <i>Isognomon ephippium</i> the fitting of Mg with SST is remarkable, stressing the usefulness of Mg in biogenic marine carbonates for reconstructing past SST.","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"Non-linear growth rates of marine calcareous organisms and the problem of decoding the recorded environmental change signal","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:58:19.190595","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2022-04-12","DateCreate":"2003-02-26","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":32769,"PubliDate":2003,"Pagination":"28-29","XtraPublOfAnaID":null,"ISBN":null,"Volume":"12","Issue":null,"BRefMon":32745,"BRefMonRR":"<b>Mees, J.; Seys, J. 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