Late Holocene relative sea level rise and the Neoglacial history of the Greenland ice sheet

Antony J. Long, Sarah A. Woodroffe, Sue Dawson, David H. Roberts, Charlotte L. Bryant

    Research output: Contribution to journalArticle

    37 Citations (Scopus)

    Abstract

    In West Greenland, early and mid Holocene relative sea level (RSL) fall was replaced by late Holocene RSL rise during the Neoglacial, after 4–3?cal. ka BP (thousand calibrated years before present). Here we present the results of an isolation basin RSL study completed near to the coastal town of Sisimiut, in central West Greenland. RSL fell from 14?m above sea level at 5.7?cal. ka BP to reach a lowstand of -4.0?m at 2.3–1.2?cal. ka BP, before rising by an equivalent amount to present. Differences in the timing and magnitude of the RSL lowstand between this and other sites in West and South Greenland record the varied interplay of local and non-Greenland RSL processes, notably the reloading of the Earth's crust caused by a Neoglacial expansion of the Greenland Ice Sheet (GIS) and the subsidence associated with the collapse of the Laurentide Ice Sheet forebulge. This means that the timing of the sea level lowstand cannot be used to infer directly when the GIS advanced during the Neoglacial. The rise in Late Holocene RSL is contrary to recently reported bedrock uplift in the Sisimiut area, based on repeat GPS surveys. This indicates that a belt of peripheral subsidence around the current ice sheet margin was more extensive in the late Holocene, and that there has been a switch from subsidence to uplift at some point in the last thousand years or so. Copyright © 2008 John Wiley & Sons, Ltd.
    Original languageEnglish
    Pages (from-to)345-359
    Number of pages15
    JournalJournal of Quaternary Science
    Volume24
    Issue number4
    DOIs
    Publication statusPublished - May 2009

    Fingerprint

    Neoglacial
    ice sheet
    Holocene
    sea level
    history
    lowstand
    subsidence
    uplift
    Laurentide Ice Sheet
    sea level rise
    Greenland
    Sea Level
    Late Holocene
    Sea-level Rise
    History
    bedrock
    GPS

    Keywords

    • Holocene
    • Isolation basin
    • Diatoms
    • Isostasy
    • Neoglacial

    Cite this

    Long, Antony J. ; Woodroffe, Sarah A. ; Dawson, Sue ; Roberts, David H. ; Bryant, Charlotte L. / Late Holocene relative sea level rise and the Neoglacial history of the Greenland ice sheet. In: Journal of Quaternary Science. 2009 ; Vol. 24, No. 4. pp. 345-359.
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    abstract = "In West Greenland, early and mid Holocene relative sea level (RSL) fall was replaced by late Holocene RSL rise during the Neoglacial, after 4–3?cal. ka BP (thousand calibrated years before present). Here we present the results of an isolation basin RSL study completed near to the coastal town of Sisimiut, in central West Greenland. RSL fell from 14?m above sea level at 5.7?cal. ka BP to reach a lowstand of -4.0?m at 2.3–1.2?cal. ka BP, before rising by an equivalent amount to present. Differences in the timing and magnitude of the RSL lowstand between this and other sites in West and South Greenland record the varied interplay of local and non-Greenland RSL processes, notably the reloading of the Earth's crust caused by a Neoglacial expansion of the Greenland Ice Sheet (GIS) and the subsidence associated with the collapse of the Laurentide Ice Sheet forebulge. This means that the timing of the sea level lowstand cannot be used to infer directly when the GIS advanced during the Neoglacial. The rise in Late Holocene RSL is contrary to recently reported bedrock uplift in the Sisimiut area, based on repeat GPS surveys. This indicates that a belt of peripheral subsidence around the current ice sheet margin was more extensive in the late Holocene, and that there has been a switch from subsidence to uplift at some point in the last thousand years or so. Copyright {\circledC} 2008 John Wiley & Sons, Ltd.",
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    Late Holocene relative sea level rise and the Neoglacial history of the Greenland ice sheet. / Long, Antony J.; Woodroffe, Sarah A.; Dawson, Sue; Roberts, David H.; Bryant, Charlotte L.

    In: Journal of Quaternary Science, Vol. 24, No. 4, 05.2009, p. 345-359.

    Research output: Contribution to journalArticle

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    N2 - In West Greenland, early and mid Holocene relative sea level (RSL) fall was replaced by late Holocene RSL rise during the Neoglacial, after 4–3?cal. ka BP (thousand calibrated years before present). Here we present the results of an isolation basin RSL study completed near to the coastal town of Sisimiut, in central West Greenland. RSL fell from 14?m above sea level at 5.7?cal. ka BP to reach a lowstand of -4.0?m at 2.3–1.2?cal. ka BP, before rising by an equivalent amount to present. Differences in the timing and magnitude of the RSL lowstand between this and other sites in West and South Greenland record the varied interplay of local and non-Greenland RSL processes, notably the reloading of the Earth's crust caused by a Neoglacial expansion of the Greenland Ice Sheet (GIS) and the subsidence associated with the collapse of the Laurentide Ice Sheet forebulge. This means that the timing of the sea level lowstand cannot be used to infer directly when the GIS advanced during the Neoglacial. The rise in Late Holocene RSL is contrary to recently reported bedrock uplift in the Sisimiut area, based on repeat GPS surveys. This indicates that a belt of peripheral subsidence around the current ice sheet margin was more extensive in the late Holocene, and that there has been a switch from subsidence to uplift at some point in the last thousand years or so. Copyright © 2008 John Wiley & Sons, Ltd.

    AB - In West Greenland, early and mid Holocene relative sea level (RSL) fall was replaced by late Holocene RSL rise during the Neoglacial, after 4–3?cal. ka BP (thousand calibrated years before present). Here we present the results of an isolation basin RSL study completed near to the coastal town of Sisimiut, in central West Greenland. RSL fell from 14?m above sea level at 5.7?cal. ka BP to reach a lowstand of -4.0?m at 2.3–1.2?cal. ka BP, before rising by an equivalent amount to present. Differences in the timing and magnitude of the RSL lowstand between this and other sites in West and South Greenland record the varied interplay of local and non-Greenland RSL processes, notably the reloading of the Earth's crust caused by a Neoglacial expansion of the Greenland Ice Sheet (GIS) and the subsidence associated with the collapse of the Laurentide Ice Sheet forebulge. This means that the timing of the sea level lowstand cannot be used to infer directly when the GIS advanced during the Neoglacial. The rise in Late Holocene RSL is contrary to recently reported bedrock uplift in the Sisimiut area, based on repeat GPS surveys. This indicates that a belt of peripheral subsidence around the current ice sheet margin was more extensive in the late Holocene, and that there has been a switch from subsidence to uplift at some point in the last thousand years or so. Copyright © 2008 John Wiley & Sons, Ltd.

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