Changes in monsoon-driven upwelling in the South China Sea over glacial Terminations I and II: a multi-proxy record

Sadatzki, H., Sarnthein, M. and Andersen, Nils (2016) Changes in monsoon-driven upwelling in the South China Sea over glacial Terminations I and II: a multi-proxy record International Journal of Earth Sciences, 105 (4). pp. 1273-1285. DOI 10.1007/s00531-015-1227-6.

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Upwelling intensity in the South China Sea has changed over glacial-interglacial cycles in response to orbital-scale changes in the East Asian Monsoon. Here, we evaluate new multi-proxy records of two sediment cores from the north-eastern South China Sea to uncover millennial-scale changes in winter monsoon-driven upwelling over glacial Terminations I and II. On the basis of U/Th-based speleothem chronology, we compare these changes with sediment records of summer monsoon-driven upwelling east of South Vietnam. Ocean upwelling is traced by reduced (UK'37-based) temperature and increased nutrient and productivity estimates of sea surface waters (delta C-13 on planktic foraminifera, accumulation rates of alkenones, chlorins, and total organic carbon). Accordingly, strong winter upwelling occurred north-west of Luzon (Philippines) during late Marine Isotope Stage 6.2, Heinrich (HS) and Greenland stadials (GS) HS-11, GS-26, GS-25, HS-1, and the Younger Dryas. During these stadials, summer upwelling decreased off South Vietnam and sea surface salinity reached a maximum suggesting a drop in monsoon rains, concurrent with speleothem records of aridity in China. In harmony with a stadial-to-interstadial see-saw pattern, winter upwelling off Luzon in turn was weak during interstadials, in particular those of glacial Terminations I and II, when summer upwelling culminated east of South Vietnam. Most likely, this upwelling terminated widespread deep-water stratification, coeval with the deglacial rise in atmospheric CO2. Yet, a synchronous maximum in precipitation fostered estuarine overturning circulation in the South China Sea, in particular as long as the Borneo Strait was closed when sea level dropped below -40 m.

Document Type: Article
Additional Information: Times Cited: 0 Sadatzki, Henrik Sarnthein, Michael Andersen, Nils
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
DOI etc.: 10.1007/s00531-015-1227-6
ISSN: 1437-3254
Projects: Future Ocean
Date Deposited: 25 Feb 2017 07:00
Last Modified: 25 Feb 2017 07:00

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