Session: Benchmarking & cross-cutting Group 1 (Isotope modelling, COMPARE)
Author: Xu Zhang / email@example.com / Alfred Wegener Institute Helmholtz centre for Polar and Marine Research
Co-author: Akil Hossain, Alfred Wegener Institute Helmholtz centre for Polar and Marine Research;
Gerrit Lohmann, Alfred Wegener Institute Helmholtz centre for Polar and Marine Research;
Previous studies show considerable mismatches between MARGO SST and LGM simulations in the North Atlantic. Since MARGO SST reconstruction is a compiled ocean archive that comprises different proxies including planktonic foraminifera, diatom, radiolarian, dinocyst, alkenones and Mg/Ca, this mismatch can be potentially related to individual proxies that characterise a temperature bias and dominate in the compiled archive. Here we compare the individual SST proxies with LGM model outputs and find that there are significant data-model misfits in alkenones and dinocys. By considering potential impacts of habitats depth and growing seasons of the species on data interpretation, we can provide a better agreement of proxy data with model results. The work provides a clear reference for both proxy data and modelling communities that seek for a more reliable data-model comparison. Since MARGO data is a widely-used LGM ocean archive, our work suggests that previous conclusions directly derived from MARGO SST need to be carefully re-evaluated.