Evolution of the central Nordic Seas over the last 20 thousand years

Telesiński, Maciej Mateusz; Bauch, Henning A.; Spielhagen, Robert F.; Kandiano, Evgenia S

doi:10.1016/j.quascirev.2015.05.013

Cited by 26 publications

(40 citation statements)

References 93 publications

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“…Bauch et al, 2001;Carbonara et al, 2016;Groot et al, 2014;Müller and Stein, 2014;Rigual-Hernández et al, 2017;Risebrobakken et al, 2011;Telesiński et al, 2015;Werner et al, 2013Werner et al, , 2016, coinciding with a general warming trend in the entire Svalbard region -especially after the PBO (e.g. Hald et al, 2004;Rasmussen et al, 2012;Sarnthein et al, 2003;Skirbekk et al, 2010;Ślubowska et al, 2005; this study, see Fig.…”

Section: The Role Of Atlantic Water In the Deglaciation History Of Thsupporting

confidence: 60%

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

et al. 2017

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Abstract. Atlantic Water (AW) advection plays an important role in climatic, oceanographic and environmental conditions in the eastern Arctic. Situated along the only deep connection between the Atlantic and the Arctic oceans, the Svalbard Archipelago is an ideal location to reconstruct the past AW advection history and document its linkage with local glacier dynamics, as illustrated in the present study of a 275 cm long sedimentary record from Woodfjorden (northern Spitsbergen; water depth: 171 m) spanning the last ∼ 15 500 years.

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Section: The Role Of Atlantic Water In the Deglaciation History Of Thsupporting

confidence: 60%

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

et al. 2017

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“…The Greenland Gyre and the deep convection in the Greenland Sea reached their maximum intensities around that time (Telesiński et al . , ). These processes required an intensive inflow of AW.…”

Section: Discussionmentioning

confidence: 99%

“…ka BP was the time of the establishment of the modern circulation pattern in the Nordic Seas (Thornalley et al 2010). The Greenland Gyre and the deep convection in the Greenland Sea reached their maximum intensities around that time (Telesi nski et al 2014(Telesi nski et al , 2015. These processes required an intensive inflow of AW.…”

Section: Discussionmentioning

confidence: 99%

Palaeoceanographic evolution of the SW Svalbard shelf over the last 14 000 years

Telesiński

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et al. 2017

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The palaeoceanographic evolution of the SW Svalbard shelf west of Hornsund over the last 14 000 years was reconstructed using benthic foraminiferal assemblages, stable oxygen and carbon isotopes, and grain‐size and ice‐rafted debris data. The results reveal the complexity of the feedbacks influencing the shelf environment: the inflow of Atlantic and Arctic waters (AW and ArW, respectively), and the influence of sea ice and tidewater glaciers. The inflow of subsurface AW onto the shelf gradually increased with the first major intrusion at the end of the Bølling‐Allerød. During the Younger Dryas, the shelf was affected by fresh water originating from sea ice and glacier discharge. Glaciomarine conditions prevailed until the earliest Holocene with the intense deliveries of icebergs and meltwater from retreating glaciers and the occasional penetration of AW onto the shelf. Other major intrusions of AW occurred before and after the Preboreal oscillation (early Holocene), which resulted in more dynamic and open‐water conditions. Between 10.5 and 9.7 cal. ka BP, the shelf environment transformed from glaciomarine to open marine conditions. Between c. 9.7 and 6.1 cal. ka BP the AW advection reached its maximum, resulting in a highly dynamic and productive environment. At c. 6.1 cal. ka BP, the inflow of AW onto the Svalbard shelf decreased due to the intensification of the Greenland Gyre and the subduction of AW under the sea‐ice‐bearing ArW. Bioproductivity decreased over the next c. 5500 years. During the Little Ice Age, bioproductivity increased due to favourable conditions in the marginal sea‐ice zone despite the effects of cooling. The renewed advection of AW after AD 1850 started the climate warming trend observed presently. Our findings show that δ18O can be used to reconstruct the dominances of different water‐masses and, with some caution, as a proxy for the presence of sea ice in frontal areas over the northwestern Eurasian shelves.

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“…However, model and data assessments would also suggest overall unfavorable conditions for convection in the central Nordic Seas prior to ~7 ka B.P. [ Simstich et al ., ; Telesiński et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Sea surface density gradients in the Nordic Seas during the Holocene as revealed by paired microfossil and isotope proxies

et al. 2016

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We attempt to assess the Holocene surface‐subsurface seawater density gradient on millennial time scale based on the reconstruction of potential density (σθ) by combining data from dinoflagellate cyst assemblages and planktic foraminiferal (Neogloboquadrina pachyderma (s)) stable oxygen isotopes (δ18Oc). Following several calibration exercises, the likeliness of favorable seasonal preconditioning to open ocean convection is evaluated. The reconstructed σθ values reveal unfavorable conditions for vertical convection in the western Nordic Seas prior to ~7–6.5 ka B.P., with a westward increase and persistence of surface water buoyancy. Active overturning became more likely after 6.5 ka B.P. as suggested by a reduced and recurrently inverted vertical σθ gradient, while intermittent eastward spreading of lower density surface waters continued to modulate the area of potential overturning. Despite some reservation regarding the accuracy of the σθ values reconstructed, the documentation of relative changes of σθ gradients through time and space is suggested as a helpful tool for the appraisal of past overturning likeliness.

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Evolution of the central Nordic Seas over the last 20 thousand years

Cited by 26 publications

References 93 publications

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

Atlantic Water advection vs. glacier dynamics in northern Spitsbergen since early deglaciation

Palaeoceanographic evolution of the SW Svalbard shelf over the last 14 000 years

Sea surface density gradients in the Nordic Seas during the Holocene as revealed by paired microfossil and isotope proxies

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