Late-Holocene Atlantic bottom-water variability in Igaliku Fjord, South                 Greenland, reconstructed from foraminifera faunas

Lassen, Susanne; Kuijpers, Antoon; Kunzendorf, H.; Hoffmann-Wieck, Gerd; Mikkelsen, Naja; Konradi, Peter B.

doi:10.1191/0959683604hl699rp

Cited by 64 publications

(100 citation statements)

References 35 publications

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“…A similar increase in sea-ice cover during the LIA has been recognized in a number of records from along the West Greenland coast (Lassen et al, 2004;Roncaglia and Kuijpers, 2004;Lloyd, 2006;Seidenkrantz et al, 2007), although some records suggest an earlier (Seidenkrantz et al, 2008) or later (Ribeiro et al, 2012) onset of strong sea-ice conditions in the Disko Bugt area. Reconstruction of the mid-Holocene SIC record for the Vaigat Strait based on the same diatom SIC transfer function indicates that an extensive sea-ice cover occurred after ca.…”

Section: Changes In Sea-ice Concentration and Their Regional Significmentioning

confidence: 94%

Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium

Sha

Jiang

Seidenkrantz

et al. 2016

Quaternary Science Reviews

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a b s t r a c tArctic sea ice represents an important component of the climate system, and the present reduction of sea ice in the Arctic is of major concern. Despite its importance, little is known about past changes in sea-ice cover and the underlying forcing mechanisms. Here, we use diatom assemblages from a marine sediment core collected from the West Greenland shelf to reconstruct changes in sea-ice cover over the last millennium. The proxy-based reconstruction demonstrates a generally strong link between changes in sea-ice cover and solar variability during the last millennium. Weaker (or stronger) solar forcing may result in the increase (or decrease) in sea-ice cover west of Greenland. In addition, model simulations show that variations in solar activity not only affect local sea-ice formation, but also control the sea-ice transport from the Arctic Ocean through a sea-iceeoceaneatmosphere feedback mechanism. The role of solar forcing, however, appears to have been more ambiguous during an interval around AD 1500, after the transition from the Medieval Climate Anomaly to the Little Ice Age, likely to be driven by a range of factors.

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Section: Changes In Sea-ice Concentration and Their Regional Significmentioning

confidence: 94%

Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium

Sha

Jiang

Seidenkrantz

et al. 2016

Quaternary Science Reviews

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“…However, the Medieval Climate Anomaly (MCA) (1200-800 cal yr BP) seems to have been associated with warming of subsurface waters of the outer Disko Bugt (Lloyd et al 2007), although the coastal regions of SW Greenland were subject to a decrease in the Atlantic water component of the WGC (Lassen et al, 2004;Seidenkrantz et al, 2007). Also in Vaigat Strait the benthic foraminifera indicate a minor warming of subsurface waters along with iceberg rafting and associated cooling of surface waters in both Vaigat Strait and the outer Disko Bugt (Moros et al 2006.…”

Section: B Causal Mechanisms Behind Variability In the Wgcmentioning

confidence: 99%

“…Bugt despite increased WGC influx along West Greenland (Lassen et al 2004;Seidenkrantz et al 2007). The NAO dipole anomaly pattern between West Greenland and the Eastern North Atlantic thus seem to have persisted during the past but was significantly weaker during the last 1000 years.…”

Section: B Causal Mechanisms Behind Variability In the Wgcmentioning

confidence: 99%

Interaction between subsurface ocean waters and calving of the Jakobshavn Isbræ during the late Holocene

et al. 2010

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'Interaction between subsurface ocean waters and calving of Jakobshavn Isbrae during the Late Holocene.', The Holocene., 21 (2). pp. 211-224. Further information on publisher's website:http://dx.doi.org/10.1177/0959683610378877Publisher's copyright statement:The nal denitive version of this article has been published in the Journal 'The Holocene' 21/2, 2011 c The Authors by SAGE Publications Ltd at the The Holocene page: http://hol.sagepub.com on SAGE Journals Online: http://online.sagepub.com/ Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. A. IntroductionIt is becoming increasingly clear that the cryosphere is responding quickly to the atmospheric temperature increase observed over recent decades (Box et al., 2006;Fettweis, 2007; Hanna et al. 2 2008;Mernild et al. 2008a). However, prediction of the contribution of the Greenland ice sheet to global sea-level rise is complicated by the lack of detailed knowledge on mechanisms behind ice sheet change. In particular ice streams and their interaction with the atmospheric and oceanic systems needs further investigation in order to make more realistic models of future sea-level rise.In this study the Late Holocene climate history of the Jakobshavn Isbrae region ( also been proposed as a crucial mechanism triggering ice sheet destabilisation and large-scale iceberg surges during glacial periods (Moros et al., 2002). Following these observations we aim at evaluating if intrusion of relatively warmer waters into Disko Bugt occurred on multi-decadal to centennial timescales and if so how these incursions affected the calving of icebergs. This may shed light on whether the modern acceleration of the Jakobshavn Isbrae is one of a kind and whether ocean-ice-sheet interaction is an important component of the climate-cryosphere system that needs to be assessed in details in climate models.Variability of the subsurface and surface water is reconstructed by analysis of the benthic foraminiferal and dinoflagellate assemblage, respectively, and the production of icebergs and sea-ice is reconstructed on the basis of the ice-rafted debris in the sediment core. produced by, among others, the Jacobshavn Isbrae.The modern day climate of the Disko Bugt region is low arctic maritime with a mean annual temperature of -5.2°C, a summer mean of 4.8°C (Fredskild, 1996) and high precipitation.The bay is typically covered by land-fast sea-ice from mid-January to mid-April with a mean thickness of 0.7 m (Buch, 2000). During spring and summer a strong pycnocline is developed ...

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“…Greenland fjords record periods of increased presence of warm, Atlantic waters during the LIA, sourced from the North Atlantic (Lassen et al, 2004;Seidenkrantz et al, 2007), although the pattern is complicated, partly reflecting the complex hydrographic conditions of fjord settings with variable ocean and ice sheet influences.…”

mentioning

confidence: 99%

Relative sea-level change in Greenland during the last 700 yrs and ice sheet response to the Little Ice Age

Long

Woodroffe

Milne

et al. 2012

Earth and Planetary Science Letters

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(2012) 'Relative sea-level change in Greenland during the last 700 years and ice sheet response to the Little Ice Age.', Earth and planetary science letters., 315-316 . pp. 76-85. Further information on publisher's website:http://dx.doi.org/10.1016/j.epsl.2011.06.027Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Earth and planetary science letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. A denitive version was subsequently published in Earth and planetary science letters, 315-316, 2012, 10.1016/j.epsl.2011.06.027 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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Late-Holocene Atlantic bottom-water variability in Igaliku Fjord, South Greenland, reconstructed from foraminifera faunas

Abstract: Bond et al. (1997).SET

Cited by 64 publications

References 35 publications

Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium

Solar forcing as an important trigger for West Greenland sea-ice variability over the last millennium

Interaction between subsurface ocean waters and calving of the Jakobshavn Isbræ during the late Holocene

Relative sea-level change in Greenland during the last 700 yrs and ice sheet response to the Little Ice Age

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