Spatial variations in nutrient utilization, production and diagenesis in the sediments of a coastal upwelling regime (NW Africa): Implications for the paleoceanographic record

摘要

A biogeochemical study of recent (multicores) sediments of the northwest African slope was undertaken to understand how the sediment composition varies with respect to the location of core sites relative to the centers of coastal upwelling, and how this has affected the palaeocean ographic record. Sedimentary organic carbon contents are inversely correlated with the nitrogen isotopic composition (δ~15), high C_organic concentrations and low δ~15N occurring at proximal (shallow) sites and the opposite at distal deep) ones.