| Popis: |
When environmental archives are sampled, its measured values are on a distance grid. However, in order to compare different data records, a time grid is needed. Distance-time relationships are non-linear, because the accretion rate of these archives depends on environmental factors. In environmental archives samples are taken over a volume in distance, rather than over a point in distance. This implies that the samplevalues will be averaged over the volume of the sample. In this paper a method is proposed, which identifies the non-linearities in the time-distance relationship and corrects for the averaging effects. In order to assess the influence of the noise on the actual parameter values a Monte Carlo simulation was performed. The applicability of the method is demonstrated on the measurement of the vessel density in R. mucronata, which is an indicator of the rainfall in the tropics. |
