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    Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland

    Access Status
    Fulltext not available
    Authors
    Geirsdottir, A.
    Miller, Gifford
    Larsen, D.
    Olafsdottir, S.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Geirsdottir, A. and Miller, G. and Larsen, D. and Olafsdottir, S. 2013. Abrupt Holocene climate transitions in the northern North Atlantic region recorded by synchronized lacustrine records in Iceland. Quaternary Science Reviews. 70: pp. 48-62.
    Source Title
    Quaternary Science Reviews
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0277379113001157
    ISSN
    0277-3791
    URI
    http://hdl.handle.net/20.500.11937/33817
    Collection
    • Curtin Research Publications
    Abstract

    Two high-sediment-accumulation-rate Icelandic lakes, the glacial lake Hvítárvatn and the non-glaciallake Haukadalsvatn, contain numerous tephra layers of known age, which together with highresolutionpaleomagnetic secular variations allow synchronization with a well-dated marine core from the shelf north of Iceland. A composite standardized climate record from the two lakes provides a single time series that efficiently integrates multi-proxy data that reflect the evolution of summer temperaturesthrough the Holocene. The first-order trends in biogenic silica (BSi), d13C, and C:N rise relatively abruptly following deglaciation, reaching maximum values shortly after 8 ka following a complex minimum between 8.7 and 8.0 ka. The Holocene Thermal Maximum (HTM) in the lakes is marked by all proxies, with a sharp transition out of the 8 ka cold event into peak summer warmth by 7.9 ka, and continuing warm with some fluctuations until 5.5 ka. Decreasing summer insolation after the HTM is reflected by incremental cooling, initially w5.5 ka, with subsequent cold perturbations recorded by all proxies 4.3 to 4.0 ka and 3.1 to 2.8 ka. The strongest disturbance occurred after 2 ka with initial summer cooling occurring between 1.4 and 1.0 ka, followed by a more severe drop in summer temperatures after 0.7 ka culminating between 0.5 and 0.2 ka. Following each late Holocene cold departure, BSi re-equilibrated at a lower value independent of the sediment accumulation rate. Some of the abrupt shifts may be related to Icelandic volcanism influencing catchment stability, but the lack of a full recovery to pre-existing values after the perturbation suggests increased periglacial activity, decreased vegetation cover, and glacier growth in the highlands of Iceland. The similarity in timing, direction and magnitude of our multi-proxy records from glacial and non-glacial lakes, and from the adjacent marine shelf, suggests that our composite record reflects large-scale shifts in ocean/atmosphere circulation throughout the northern North Atlantic.

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