South China Sea ODP1144 260KYr Mg/Ca SST Wei, G.; Deng, W.; Liu, Y.; Li, X. Wei, G. Deng, W. Liu, Y. Li, X. Sea Surface Temperature Reconstruction earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,G. sacculifer) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Trilobatus sacculifer,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 1144>LATITUDE 20.053>LONGITUDE 117.419) High-resolution sea surface temperatures (SST) derived from Mg/Ca ratios of Globeriginoides sacculifer at ODP Site 1144 were reported to reveal the SST changes during the last 260 ka in the northern South China Sea (SCS). The results indicate an average Holocene SST of about 26.7°C, about 3.6°C increase from LGM to the Holocene, and higher temperature during MIS 5.5 than the Holocene. These agree well with other foraminifer Mg/Ca and Uk37 SST records in this region. The Mg/Ca records suggest warmer SSTs during MIS 3 in the northern SCS, compared with those in the eastern Pacific. Strong East Asian summer monsoon during MIS 3 indicated by paleoclimate records from nearby continents may account for it. Step-wise increases during terminations are shown in our SST record, and the beginning of deglacial warming occurs at about 19 ka, which precedes the change of oxygen isotopes, suggesting a tropical driven forcing for the SST change in the northern SCS. This is further supported by a robust semiprecessional cycle centering at ~9.1 ka in the spectra of the SST record, which is absent in that of the oxygen isotopes. However, tropical driven forcing seems not to be indicated in another Mg/Ca SST record in the northern SCS [Oppo, D.W. and Sun, Y.B., 2005. Amplitude and timing of sea-surface temperature change in the northern South China Sea: Dynamic link to the East Asian monsoon. Geology, 33 (10): 785–788.]. The discrepancy may be caused by different post-deposition dissolutions of foraminifer tests at these two sites. Details about the modification of foraminifer Mg/Ca ratios after burial, however, are not well known in this region, and further studies are needed. STUDY NOTES: Foraminiferal Mg/Ca data and SST calculations from South China Sea core ODP1144 for the past 260,000 years. Mg/Ca ratios were measured on tests of Globeriginoides sacculifer. SST calculations are by the calibration of Nurnberg et al. 2000. ODP1144 14C age data provided are from Table T2, Büehring et al. (2004) NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Wei, G. Investigator : Deng, W. Investigator : Liu, Y. Investigator : Li, X. 2011-06-14 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/11204 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wei2007/wei2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wei2007/wei2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wei2007/wei2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wei2007/wei2007.xls English https://www.ncdc.noaa.gov/paleo/study/11204 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wei2007/wei2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wei2007/wei2007.xls Wei, G., W. Deng, Y. Liu, and X. Li. 2007. High-resolution sea surface temperature records derived from foraminiferal Mg/Ca ratios during the last 260 ka in the northern South China Sea. Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 250, pp. 126-138, START YEAR: 261300 cal yr BP * END YEAR: 1740 cal yr BP 117.419 20.053 117.419 20.053