(Table 1) Age determination of sediment core MD01-2390, supplement to: Steinke, Stephan; Mohtadi, Mahyar; Groeneveld, Jeroen; Lin, Li-Chuan; Löwemark, Ludvig; Chen, Min-Te; Rendle-Bühring, Rebecca (2010): Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development. Paleoceanography, 25(2), PA2219


Upper water column dynamics in the southern South China Sea were reconstructed in order to track changes in the activity of the East Asian winter monsoon (EAWM) since the Last Glacial Maximum. We used the difference in the stable oxygen isotopes (Delta d18O) and Mg/Ca-based temperatures (Delta T) of surface-dwelling (G. ruber) and thermocline-dwelling (P. obliquiloculata) planktonic foraminifera and the temperature difference between alkenone- and P. obliquiloculata Mg/Ca-based temperatures to estimate the upper ocean thermal gradient at International Marine Past Global Change Study (IMAGES) core MD01-2390. Estimates of the upper ocean thermal gradient were used to reconstruct mixed layer dynamics. We find that ourDelta d18O estimates are biased by changes in salinity and, thus, do not display a true upper ocean thermal gradient. The Delta T of G. ruber and P. obliquiloculata as well as the alkenone and P. obliquiloculata suggest increased surface water mixing during the late glacial, likely due to enhanced EAWM winds. Surface water mixing was weaker during the late Holocene, indicating a weaker influence of winter monsoon winds. The weakest winter monsoon activity occurred between 6.5 ka and 2.5 ka. Inferred EAWM changes since the Last Glacial Maximum coincide with EAWM changes as recorded in Chinese loess sediments. We find that the intensity of the EAWM and the East Asian summer monsoon show an inverse behavior during the last glacial and deglaciation but covaried during the middle to late Holocene. Samples measured at the Nagoya University Center for Chronological Research, Japan are published previously by Steinke et al. (2006). The 14C ages were calibrated using CALIB 5.0.1 and the marine 04.14c data set (Hughen et al., 2004) without a further adjustment for a regional 14C reservoir age (Delta R = deviation from the average global reservoir age of 400 years).

DOI https://doi.org/10.1594/PANGAEA.831542
Related Identifier https://doi.org/10.1029/2009PA001850
Related Identifier https://doi.org/10.1016/j.quascirev.2005.12.008
Related Identifier https://doi.org/10.1594/PANGAEA.738282
Related Identifier https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/4168
Related Identifier https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3781
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.831542
Creator Steinke, Stephan; Mohtadi, Mahyar; Groeneveld, Jeroen; Lin, Li-Chuan; Löwemark, Ludvig; Chen, Min-Te; Rendle-Bühring, Rebecca
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2010
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 75 data points
Discipline Earth System Research
Spatial Coverage (113.409 LON, 6.635 LAT); South China Sea