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Proxy dependence of the temporal pattern of deglacial warming in the tropical South China Sea: toward resolving seasonality
- Source :
-
Quaternary Science Reviews . Apr2008, Vol. 27 Issue 7/8, p688-700. 13p. - Publication Year :
- 2008
-
Abstract
- Abstract: 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 ∼17 and 15ka 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 δ18O. 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 18ka BP without any marked response to H1, G. ruber s.l.-based Mg/Ca SST estimates reveal a cooling around ∼17–15ka 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. [Copyright &y& Elsevier]
- Subjects :
- *GLACIAL climates
*CLIMATE change
*OCEAN temperature
Subjects
Details
- Language :
- English
- ISSN :
- 02773791
- Volume :
- 27
- Issue :
- 7/8
- Database :
- Academic Search Index
- Journal :
- Quaternary Science Reviews
- Publication Type :
- Academic Journal
- Accession number :
- 31922061
- Full Text :
- https://doi.org/10.1016/j.quascirev.2007.12.003