We present a 15 kyr sea surface temperature (SST) record for a high sedimentation rate core (KNR51‐29GGC) from the Feni Drift off of Ireland, based on an organic geochemical technique for paleotemperature estimation, U37K′. We compare the U37K′temperature record to planktonic foraminiferal δ18O and foraminiferal assemblage SST estimates from the same sample horizons. U37K′gives SST estimates of 13°C for the early deglacial and 18°C for the Holocene and Recent, whereas assemblages give estimates of 9°C and 13°C, respectively. As in nearby core V23‐81, we find Ash Zone 1, the Younger Dryas increase inNeogloboquadrina pachydermasinistral abundance, and maximum abundance of this species during glaciation.N. pachydermadextral oxygen isotopic analyses have a late glacial to interglacial range of 1.5‰. A reduction of about 1 ‰ in δ18O occurred at about 12 ka, whereas U37K′and the foraminiferal fauna indicate a 2°C warming. This implies a 0.9‰ salinity effect on δ18O which we attribute to meltwater freshening. All three parameters indicate cooling during the Younger Dryas. U37K′SST estimates show that the major shift from deglacial to interglacial temperatures occurred after the Younger Dryas in termination 1b, in contrast to the assemblage data, which show this jump in SST at the end of the glaciation during termination Ia. Differences between the two SST estimators, which may result from their different (floral versus faunal) sources, are more pronounced between transitions Ia and Ib. This may reflect different habitats under the unusual sea surface con
展开▼
