Evidence and significance of major meltwater events between H1 and H2 along the eastern Canadian margin

Meltwater events between Heinrich (H) events 1 and 2 are investigated from deep-water cores to address spatial and temporal meltwater variability in response to ice sheet dynamics. Heinrich events are widely recognized on the eastern Canadian margin, though meltwater events between H1 and H2 have not been studied in detail. While ma-jor meltwater events have been identified on the European margin, only one site on the eastern Canadian margin (Laurentian Fan) has suggested a major meltwater event be-tween H1 and H2. Here we explore whether major meltwater events are observed at additional sites between H1 and H2. We will present data (e.g. color, carbonate content, IRD, etc.) from ~15 cores taken seaward of ice streams along the margin from Hudson Strait to Laurentian Channel. These cores indicate the existence of meltwater anomalies between H1 and H2 that can be traced and correlated along the margin. We find turbid-ites inter-layered with laminae of IRD, bracketed with hemipelagic sediments in cores proximal of major outlets, likely resulting from a combination of meltwater and iceberg discharge. Whereas IRD is nearly absent in similar turbidite sequences in cores proxi-mal of minor outlets, likely resulting from meltwater discharge only. Biogenic carbon-ate varies out-of-phase with inorganic carbonate and may reflect turbidite activity and the amount of terrigenous organic material delivered from land during meltwater events. Our results show that the Labrador Current and Gulf Stream play a significant role in distributing meltwater plumes from major outlets along the eastern Canadian margin and to the North Atlantic. Whereas sediments from minor outlets are transported directly to deepwater via turbidity currents, and the resulting meltwater plume trans-ported is diluted within the major currents. This dilution explains why meltwater sig-nals from minor outlets are not recorded in the North Atlantic. Nevertheless, minor out-lets are generating a significant amount of meltwater that may have impacts on ocean circulation.