Using growth and geochemical composition of Clathromorphum compactum to track multiscale North Atlantic hydro-climate variability

Records of ocean/atmosphere dynamics over the past centuries are essential to understand processes driving climate variability. This is particularly true for Northwest Atlantic which a key region with an role in global regulation. Over two decades, coralline red algae have been increasingly used as environmental and climatic archives marine realm hold potential extend long-term instrumental measurements. Here, we investigate possibility extract information from annual growth patterns geochemical composition algae, Clathromorphum compactum, Saint-Pierre & Miquelon (SPM), French archipelago southwest Newfoundland. However, measurements C. compactum trends challenging due difficulties identifying lines directly. So far, pattern investigations were commonly performed based on data calcite matrix. Nonetheless, this method expensive therefore prevents analyzing large number specimens that would be representative population. For reason, enhanced line readability by staining polished sections Mutvei's solution analysis direct increment width Geochemical analyses also carried out order validate assumption observed after formed basis. Moreover, trace element measured multiple axes several individuals assess intra- inter-specimen variability their use paleoenvironmental reconstructions. Finally, relationships between sclerochronological records SPM datasets covering different geographical areas allow better knowledge flow confirm findings related Arctica islandica same location.