Steinke, S et al. (2008): Stable isotope ratios, geochemistry and paleotemperatures from sediment core MD01-2390. doi:10.1594/PANGAEA.726888, Supplement to:Steinke, Stephan; Kienast, Markus; Groeneveld, Jeroen; Lin, Li-Chuan; Chen, Min-Te; Rendle-Bühring, Rebecca (2008): Proxy dependence of the temporal patterns of deglacial warming in the tropical South China Sea: Toward resolving seasonality. Quaternary Science Reviews, 27(7-8), 688-700, doi:10.1016/j.quascirev.2007.12.003
Sea surface temperatures (SSTs), reconstructed from two Globigerinoides ruber (white) morphotypes (G. ruber sensu stricto, (s.s.); G. ruber sensu lato, ( s.l.)) Mg/Ca and alkenones (UK'37) from core MD01-2390 from the tropical South China Sea (SCS) during the last deglaciation reveal a proxy-dependent discrepancy in the temporal pattern of the deglacial warming. Alkenone data suggest that the deglacial warming is punctuated by a decrease in temperature between not, vert, similar17 and 15 ka BP, corroborating previously published alkenone UK'37 SST records from the southern SCS. Within dating uncertainties, this cooling is coeval with the Heinrich Event 1 (H1) time interval in the North Atlantic region, underscoring the imprints of northern hemisphere forcing on tropical SCS ocean temperatures. The deglacial UK'37 SST minimum is also paralleled by a maximum in G. ruber morphotype-specific d18O. G. ruber Mg/Ca SST estimates suggest a morphotype-specific record of SSTs during the time interval of H1. Whereas G. ruber s.s. imply a continuous warming starting around 18 ka BP without any marked response to H1, G. ruber s.l.-based Mg/Ca SST estimates reveal a cooling around not, vert, similar17-15 ka BP similar to the H1 interval cooling seen in the alkenone SST record. Similar proxy-dependent differences in deglacial surface water warming have been recorded in the eastern equatorial Pacific, implying a common pattern on both sides of the tropical Pacific Ocean. We submit that this discrepancy could be due to differences in seasonality of planktonic foraminifera G. ruber morphotypes and alkenone-producing algae.