Delayed sedimentary response to abrupt climate change at the Paleocene-Eocene boundary, northern Spain

Sediment routing systems (SRSs) are a critical element of the global response to ongo-ing climate change. However SRS response to climate forcing is complex, fragmentary, and obscured when viewed over short, human time scales (10−1–102 yr). Over long time scales (>102–103 yr), the aggregated, system-wide response of SRSs to climate forcing can be gleaned with more confidence from the sedimentary record, but the nature and time scales of this aggregated response to abrupt climate change are still poorly understood. Here, we investigate the aggregated temporal response of a SRS in northern Spain to abrupt climate warming at the Paleocene-Eocene thermal maximum (PETM). Our results show that terrestrial sites in northern Spain record a temporal lag of 16.5 ± 7.5 k.y. between the onset of the PETM, defined by an abrupt negative excursion in the δ13C profile, and the onset of coarse-grained deposi- tion. Within the same SRS at a deep marine site 500 km to the west, we observe a temporal lag of 16.5 ± 1.5 k.y. using an age model that is independent of that used for the terrestrial sites. These results suggest that the aggregated, system-wide response of SRSs to present- day global warming—if we take the PETM as an appropriate modern-day analogue—may persist for many millennia into the future.