An inflection in the rate of early mid-Holocene eustatic sea-level rise: a new sea-level curve from Singapore

This study presents a sea-level curve from similar to 9500 to similar to 6500 cal BP for the farfield location of Singapore, on the Sunda Shelf in southeast Asia. The curve is based on more than 50 radiocarbon dates from elevations of +1.43 m to -15.09 m representing sea-level index points in intert...

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Bibliographic Details
Published in:Estuarine, Coastal and Shelf Science
Main Authors: Bird, Michael Ian, Fifield, L K, Teh, T S, Chang, C H, Shirlaw, N, Lambeck, K
Format: Article in Journal/Newspaper
Language:English
Published: 2007
Subjects:
Holocene
sea level
radiocarbon
Sundaland
mangrove
palaeoclimate
LAST GLACIAL MAXIMUM
ANTARCTIC ICE-SHEET
GLOBAL MELTWATER DISCHARGE
LATE PLEISTOCENE
NORTHWEST SCOTLAND
MELTING HISTORY
CLIMATE-CHANGE
INDIAN-OCEAN
SHELF
Antarctic
Indian
Sunda
West Antarctic Ice Sheet
Antarc*
Ice Sheet
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/an-inflection-in-the-rate-of-early-midholocene-eustatic-sealevel-rise-a-new-sealevel-curve-from-singapore(c1483697-14a0-4e35-8749-736115ab4ab7).html
https://doi.org/10.1016/j.ecss.2006.07.004
Description
Summary:This study presents a sea-level curve from similar to 9500 to similar to 6500 cal BP for the farfield location of Singapore, on the Sunda Shelf in southeast Asia. The curve is based on more than 50 radiocarbon dates from elevations of +1.43 m to -15.09 m representing sea-level index points in intertidal mangrove and shallow marine sediments deposited by sea-level rise accompanying deglaciation. The results indicate that mean sea level rose rapidly from around -17 in at 9500 cal BP to around -3 m by 8000 cal BP. After this time, the data suggest (but do not unequivocally prove) that the rate of sea-rise slowed for a period of 300-500 years centred on similar to 7700 cal BP, shortly after the cessation of meltwater input to the oceans from the northern hemisphere. Renewed sea-level rise amounting to 3-5 m began around 7400 cal BP and was complete by 7000 cal BP. The existence of an inflection in the rate of sea-level rise, with a slow-down centred on similar to 7700 cal BP, is broadly consistent with other available sea-level curves over this interval and is supported by evidence of stable shorelines and delta initiation elsewhere at this time, as well as evidence of comparatively rapid retreat of the West Antarctic ice sheet beginning around 7500 cal BP. 'Stepped' sea-level rise occurring shortly after 7500 cal BP and also earlier during deglaciation may have served to focus significant post-glacial episodes of human maritime/coastal dispersal, into comparatively narrow time intervals. (c) 2006 Elsevier Ltd. All rights reserved.

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