Modeling δ~15N evolution: First palaeoceanographic applications in a coastal upwelling system

摘要

The δ~15M signal in marine sediments appears t be a good palaeoceanographic tracer. It records biological processes in the water column and is transferred to and preserved in the sediments. Changes in forcing factors in upwelling systems may be recorded by δ~15N. These forcing conditions Can be of a biogeochemical nature, such as the initial isotopic signal of the nutrients or the trophic Structure, or of a physical nature, such as wind stress, insolation, temperature of dynamic recycling. A simple nitrogen-based trophic chain model was used to follow the development of he nitrogen Isotopic signal in nutrients, phytoplankton, zooplankton and detritus.