Variations in temperature and extent of Atlantic Water in the northern North Atlantic during the Holocene

Hald, Morten; Andersson, Carin; Ebbesen, Hanne; Jansen, Eystein; Klitgaard‐Kristensen, Dorthe; Risebrobakken, Bjørg; Salomonsen, Gaute R; Sarnthein, Michael; Sejrup, Hans Petter; Telford, Richard J.

doi:10.1016/j.quascirev.2007.10.005

Cited by 209 publications

(230 citation statements)

References 63 publications

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“…Whilst the marked fluctuations that we record during FM4 are not consistently seen in records from the ocean realm (although see Hald et al, 2007), this may reflect the location of available records in relation to the complexities of Holocene changes in ocean circulation and conditions in the Barents Sea region. The recent modelling study by Semenov et al (2009), however, offers the intriguing possibility that the phenomena recorded by our palaeovegetation studies reflect periodic shut downs of the Barents Sea inflow triggered by solar variability through a feedback mechanism mediated by sea-ice formation.…”

Section: Discussionmentioning

confidence: 57%

“…A short-lived peak in abundance of pollen of Betula follows the renewed onset of sediment accumulation and represents the maximum abundance of this taxon at this site. However, in contrast to the other two sites, this is shortly followed by a sharp Marine records indicate that this was the period of peak warmth during the Holocene, with maximum Atlantic water inflow to the Barents region (Hald et al, 2007) and a more northerly position of the Polar Front than previously, albeit still to the south of its present position (Risebrobakken et al, 2010). The lack of any clear longitudinal gradient in our records is consistent with the inference that the Polar Front continued to lie to the west of all of our sites (Risebrobakken et al, 2010), not even the westernmost of the Finnmark coastal peninsulas coming under the direct influence of Atlantic water at this time.…”

Section: Rpi Fm3 (10200 -8500 Cal Yr Bp)mentioning

confidence: 78%

“…This fluctuation may reflect the greater sensitivity of vegetation in the west of the region at this time to varying strength of the meridional flow of Atlantic water into the Norwegian Sea. An early rapid increase in sea surface temperatures near the Faeroes, indicating increased flow of Atlantic water into the Norwegian Sea, is followed by a subsequent decline and then a slower second increase (Rasmussen et al, 2011), although evidence of this fluctuation is not apparent in records from Norwegian coastal waters nor from the western margin of the Barents Sea (Hald et al, 2007).…”

Section: Pollen Analysis and Palaeovegetationmentioning

confidence: 97%

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Spatio-temporal patterns in Lateglacial and Holocene vegetation and climate of Finnmark, northernmost Europe

Huntley

Long

Allen

2013

Quaternary Science Reviews

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. (2013) 'Spatio-temporal patterns in late-glacial and Holocene vegetation and climate of Finnmark, northernmost Europe.', Quaternary science reviews., 70 . pp. 158-175. Further information on publisher's website:http://dx.doi.org/10. 1016/j.quascirev.2013.03.006 Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Quaternary Science Reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Quaternary Science Reviews, 70, 2013Reviews, 70, , 10.1016Reviews, 70, /j.quascirev.2013 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-pro t 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. Further work on precisely-dated marine sediment cores will be necessary to understand the factors leading to the periodic and longer-term variations in strength of the North Cape Current.

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Section: Discussionmentioning

confidence: 57%

Section: Rpi Fm3 (10200 -8500 Cal Yr Bp)mentioning

confidence: 78%

Section: Pollen Analysis and Palaeovegetationmentioning

confidence: 97%

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Spatio-temporal patterns in Lateglacial and Holocene vegetation and climate of Finnmark, northernmost Europe

Huntley

Long

Allen

2013

Quaternary Science Reviews

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“…Reconstructions of the sea ice margin in the broader study region for this time period [38,74], show a gradual southward expansion and increased influence of ArW in the Barents Sea (e.g. [16]). The latter suggests the presence of sea ice in the northern Barents Sea during the middle Holocene.…”

Section: Paleoproductivity Changes Over the Last 6000 Yearsmentioning

confidence: 93%

“…The latter suggests the presence of sea ice in the northern Barents Sea during the middle Holocene. This gradual cooling trend is observed all over the Nordic seas including the Barents Sea [1,16,23,61,74]. One reason for the increasing sea ice coverage during the middle Holocene might be the coupling between decreasing summer irradiance at high northern latitudes [30] and amplifying positive feedbacks such as the complete flooding of the Arctic shelves and established modern sea-ice production/export in the Arctic Ocean [3,74].…”

Section: Paleoproductivity Changes Over the Last 6000 Yearsmentioning

confidence: 96%

Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison

Pathirana

Knies

Felix

et al. 2015

Arktos

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In this study we focus on late Holocene primary productivity (PP) variability in the western Barents Sea and its response to variable sea ice coverage by combining PP reconstructed from several sediment cores with regional PP trends simulated with a well-constrained organic facies model, OF-Mod 3D. We find that modern production rates reconstructed from buried marine organic matter (''bottomup'') resemble simulated export production at 50 m water depth inferred from numerical simulations of surface water PP in a 3D ocean model, SINMOD (''top-down''). Paleoproductivity rates in the northern Barents Sea are more variable and generally higher (30-150 gC m -2 year -1 ) than in the SW Barents Sea region (\75 gC m -2 year -1 ) throughout the last 6000 years BP. In the SW Barents Sea, PP rates and terrestrial organic matter (TOM) supply remain constantly low indicating present-day-like oceanographic conditions with only marginal influence of sea ice related processes during the last 6000 years BP. PP rates in the northern Barents Sea indicate a shift from stable modern-like conditions prior to 2800 BP to denser, more permanent sea ice coverage along the marginal ice zone (MIZ) between 2800 and 1000 years BP and low PP rates. PP rates increase around 1000 years BP indicating a northward shift of the MIZ and accelerated export towards the seabed. During the last 500 years a pronounced decline in PP rates towards the present day indicates reduced annual duration of the MIZ in the area due to global warming. Our results suggest that a combination of first-year ice and higher PP in a warming pan-Arctic may point to a potential Arctic carbon sink while sea ice is still present.

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Confocal Raman microscopy in sclerochronology: A powerful tool to visualize environmental information in recent and fossil biogenic archives

Beierlein

Nehrke

Brey

2015

Geochem Geophys Geosyst

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Biological hard parts and skeletons of aquatic organisms often archive information of past environmental conditions. Deciphering such information forms an essential contribution to our understanding of past climate conditions and thus our ability to mitigate the climatic, ecological, and social impacts of a rapidly changing environment. Several established techniques enable the visualization and reliable use of the information stored in anatomical features of such biogenic archives, i.e., its growth patterns. Here, we test whether confocal Raman microscopy (CRM) is a suitable method to reliably identify growth patterns in the commonly used archive Arctica islandica and the extinct species Pygocardia rustica (both Bivalvia). A modern A. islandica specimen from Norway has been investigated to verify the general feasibility of CRM, resulting in highly correlated standardized growth indices (r > 0.96; p < 0.0001) between CRM-derived measurements and measurements derived from the established methods of fluorescence microscopy and Mutvei's solution staining. This demonstrates the general suitability of CRM as a method for growth pattern evaluation and cross-dating applications. Moreover, CRM may be of particular interest for paleoenvironmental reconstructions, as it yielded superior results in the analysis of fossil shell specimens (A. islandica and P. rustica) compared to both Mutvei staining and fluorescence microscopy. CRM is a reliable and valuable tool to visualize internal growth patterns in both modern and fossil calcium carbonate shells that notably also facilitates the assessment of possible diagenetic alteration prior to geochemical analysis without geochemically compromising the sample. We strongly recommend the CRM approach for the visualization of growth patterns in fossil biogenic archives, where conventional methods fail to produce useful results.

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Variations in temperature and extent of Atlantic Water in the northern North Atlantic during the Holocene

Cited by 209 publications

References 63 publications

Spatio-temporal patterns in Lateglacial and Holocene vegetation and climate of Finnmark, northernmost Europe

Spatio-temporal patterns in Lateglacial and Holocene vegetation and climate of Finnmark, northernmost Europe

Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison

Confocal Raman microscopy in sclerochronology: A powerful tool to visualize environmental information in recent and fossil biogenic archives

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