10.1594/PANGAEA.738282
Steinke, Stephan
Stephan
Steinke
Chiu, Han-Yi
Han-Yi
Chiu
Yu, Pai-Sen
Pai-Sen
Yu
0000-0001-9638-0594
Shen, Chuan Chou
Chuan Chou
Shen
0000-0003-2833-2771
Erlenkeuser, Helmut
Helmut
Erlenkeuser
0000-0002-5567-4796
Löwemark, Ludvig
Ludvig
Löwemark
0000-0002-3337-2367
Chen, Min-Te
Min-Te
Chen
0000-0002-7552-1615
Oxygen isotope and Mg/Ca record of planktonic foraminifera of sediment core MD01-2390
PANGAEA
2006
Planktic Foraminifers
South China Sea
Giant piston corer
MD122
Marion Dufresne (1995)
International Marine Global Change Study (IMAGES)
2001-05-18T06:40:00
en
Supplementary Publication Series of Datasets
10.1016/j.quascirev.2005.12.008
2 datasets
application/zip
Creative Commons Attribution 3.0 Unported
Changes in the local freshwater budget over the last 22,000 years have been estimated from a sediment core located in the southern South China Sea (SCS) using a combined approach of Mg/Ca and oxygen isotopes on the planktonic foraminifera Globigerinoides ruber (white) sensu stricto (s.s.). Core MD01-2390 (06°28,12N, 113°24,56E; water depth 1591 m) is located near the glacial paleo-river mouths of the Baram, Rajang and North Sunda/Molengraaff Rivers that drained the exposed Sunda Shelf. The delta18Oseawater record reveals lower average values (-0.96±0.18 per mil) during the Last Glacial Maximum (LGM) when compared with modern values (-0.54±0.18 per mil). Low salinity during the LGM is interpreted to reflect a higher freshwater contribution due to a greater proximity of the core site to the mouths of the Baram, Rajang and North Sunda/Molengraaff Rivers at that time. A general deglacial increasing trend in salinity due to the progressive landward displacement of the coastline during deglacial shelf flooding is punctuated by several short-term shifts towards higher and lower salinity that are likely related to abrupt changes in the intensity of the East Asian summer monsoon. Thus, the deglacial delta18Oseawater changes reflect the combined effects of sea-level-induced environmental changes on the shelf (e.g. phases of retreat and breakdown of the shelf drainage systems) and East Asian monsoon climate change. Lower salinity than at present during the Early Holocene may be attributed to an increase in summer monsoonal precipitation that is corroborated by previous marine and terrestrial studies that report a Preboreal-Early Holocene monsoon optimum in the Asian monsoon region.
Supplement to: Steinke, Stephan; Chiu, Han-Yi; Yu, Pai-Sen; Shen, Chuan Chou; Erlenkeuser, Helmut; Löwemark, Ludvig; Chen, Min-Te (2006): On the influence of sea level and monsoon climate on the southern South China Sea freshwater budget over the last 22,000 years. Quaternary Science Reviews, 25(13-14), 1475-1488
113.40900000000002
6.635299999999999
South China Sea