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    Low-frequency storminess signal at Bermuda linked to cooling events in the North Atlantic region

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    palo20172.pdf (7.490Mb)
    Date
    2015-02-18
    Author
    van Hengstum, Peter J.  Concept link
    Donnelly, Jeffrey P.  Concept link
    Kingston, Andrew W.  Concept link
    Williams, Bruce E.  Concept link
    Scott, David B.  Concept link
    Reinhardt, Eduard G.  Concept link
    Little, Shawna N.  Concept link
    Patterson, William P.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7256
    As published
    https://doi.org/10.1002/2014PA002662
    DOI
    10.1002/2014PA002662
    Keyword
     Bermuda; Submarine caves; Benthic foraminifera; Oxygen isotopes; NAO; AMOC 
    Abstract
    North Atlantic climate archives provide evidence for increased storm activity during the Little Ice Age (150 to 600 calibrated years (cal years) B.P.) and centered at 1700 and 3000 cal years B.P., typically in centennial-scale sedimentary records. Meteorological (tropical versus extratropical storms) and climate forcings of this signal remain poorly understood, although variability in the North Atlantic Oscillation (NAO) or Atlantic Meridional Overturning Circulation (AMOC) are frequently hypothesized to be involved. Here we present records of late Holocene storminess and coastal temperature change from a Bermudian submarine cave that is hydrographically circulated with the coastal ocean. Thermal variability in the cave is documented by stable oxygen isotope values of cave benthic foraminifera, which document a close linkage between regional temperature change and NAO phasing during the late Holocene. However, erosion of terrestrial sediment into the submarine cave provides a “storminess signal” that correlates with higher-latitude storminess archives and broader North Atlantic cooling events. Understanding the driver of this storminess signal will require higher-resolution storm records to disentangle the contribution of tropical versus extratropical cyclones and a better understanding of cyclone activity during hemispheric cooling periods. Most importantly, however, the signal in Bermuda appears more closely correlated with proxy-based evidence for subtle AMOC reductions than NAO phasing.
    Description
    Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 30 (2015): 52–76, doi:10.1002/2014PA002662.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Paleoceanography 30 (2015): 52–76
     

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