LGM hosing approach to Heinrich Event 1: results and perspectives from data-model integration using water isotopes

Results obtained with two sets of experiments indicate that first order simulated δ18Ocalcite anomalies are broadly consistent with the measured anomalies and that a complete shutdown of the thermohaline circulation is not consistent with the reconstructed patterns from foraminiferal calcite. A more detailed statistical analysis of the planktic and benthic δ18Ocalcite anomalies shows that the best experiment is obtained for a severely disturbed thermohaline circulation but not a complete shutdown. With our model sensitivity, this corresponds to a freshwater flux between 0.18 Sv and 0.3 Sv. Our results also indicate a better agreement when the freshwater flux is applied in the Labrador Sea than when directly applied to the Ruddiman Belt.