MARINE BIOTIC RESPONSE OF THE NORTHERN ATLANTIC OCEAN DURING GRADUAL AND ABRUPT WARMING EVENTS FROM THE LATE PALEOCENE TO THE EARLY-MIDDLE EOCENE
The marine biological pump describes the fixation of carbon in surface waters through primary production and its transport to the deep-sea. Biogenic barium (Babio) has been widely applied as a proxy for the strength of the biological pump, since barite is formed during the degradation of sinking organic matter. Understanding connections between the marine biological pump and climatic perturbations of varying magnitude and duration will provide context for predicting the behavior of the biological pump in the future.
Here we present new bulk and benthic stable isotopic carbon (δ13C) and oxygen (δ18O) records from the Integrated Ocean Drilling Program (IODP) Site U1409, recovered offshore Newfoundland. We compare these records with Ocean Drilling Program (ODP) Site 1258 (Demerara Rise, Equatorial Atlantic) and ODP Site 1262 (Walvis Ridge, South Atlantic) to discriminate probable global climatic events. Additionally, we present an X-Ray Florescence (XRF) derived barium/iron (Ba/Fe) record and select, preliminary barite measurements from Site U1409 to evaluate trends in export production coincident with hyperthermals and long-term trends in climate. Our new records suggest that the Early Eocene was a time of high export production in this region and that transient increases in export coincided with short-lived warming events.