History of ice-rafting and water mass evolution at the northern Siberian continental margin (Laptev Sea) during Late Glacial and Holocene times

Taldenkova, E.; Bauch, Henning A.; Gottschalk, Julia; Nikolaev, S. D.; Rostovtseva, Yuliana V.; Pogodina, I. A.; Ovsepyan, Y.; Kandiano, Evgenia S

doi:10.1016/j.quascirev.2010.09.013

Cited by 42 publications

(57 citation statements)

References 72 publications

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“…Interpreting the appearance of C. neoteretis, numerous studies assume that the intensification of AW inflow along the Svalbard margin occurred relatively simultaneously during the Bølling-Allerød (Klitgaard Rasmussen et al, 2007;Ślubowska et al, 2005). In the Laptev Sea, this species has been connected to Atlanticderived water from ∼ 15.4 ka onwards (Taldenkova et al, 2010). AW presence is also inferred prior to ∼ 14 ka off West Greenland (Sheldon et al, 2016a).…”

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

confidence: 77%

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 Thmentioning

confidence: 77%

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

et al. 2017

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“…This socalled "sink switching" acts as an efficient P trap in sediments and limits the diffusive flux of PO 4 towards the water column (Ruttenberg and Berner, 1993;Slomp et al, 1996). As a consequence, sedimentary P concentrations can be a measure of the organic matter supply to the sediment (Calvert and Pedersen, 2007;Tribovillard et al, 2006). Trends in sedimentary P with sediment depth have, for instance, been used as evidence that upwelling zones were more productive during interglacial stages compared to glacial stages (Ganeshram et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Besides sedimentary P concentrations and C org / P ratios, the occurrence of vivianite ((Fe 3 PO 4 ) 2 · 8H 2 O) in sediments is also used in reconstructions of paleo-environmental conditions in lake and marine basins (e.g., Derkachev et al, 2007;Kalniņa et al, 2000;Taldenkova et al, 2010). These Fe(II) phosphates can precipitate in surface sediments with sulfide-depleted porewaters that are rich in both Fe 2+ and PO 4 (Berner, 1981;Nriagu and Dell, 1974;Nriagu, 1972).…”

Section: Introductionmentioning

confidence: 99%

Post-depositional formation of vivianite-type minerals alters sediment phosphorus records

et al. 2018

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Abstract. Phosphorus (P) concentrations in sediments are frequently used to reconstruct past environmental conditions in freshwater and marine systems, with high values thought to be indicative of a high biological productivity. Recent studies suggest that the post-depositional formation of vivianite, an iron(II)-phosphate mineral, might significantly alter trends in P with sediment depth. To assess its importance, we investigate a sediment record from the Bornholm Basin that was retrieved during the Integrated Ocean Drilling Program (IODP) Baltic Sea Paleoenvironment Expedition 347 in 2013, consisting of lake sediments overlain by brackish-marine deposits. Combining bulk sediment geochemistry with microanalysis using scanning electron microscope energy dispersive spectroscopy (SEM-EDS) and synchrotron-based X-ray absorption spectroscopy (XAS), we demonstrate that vivianite-type minerals rich in manganese and magnesium are present in the lake deposits just below the transition to the brackish-marine sediments (at 11.5 to 12 m sediment depth). In this depth interval, phosphate that diffuses down from the organic-rich, brackish-marine sediments meets porewaters rich in dissolved iron in the lake sediments, resulting in the precipitation of iron(II) phosphate. Results from a reactive transport model suggest that the peak in iron(II) phosphate originally occurred at the lake-marine transition (9 to 10 m) and moved downwards due to changes in the depth of a sulfidization front. However, its current position relative to the lake-marine transition is stable as the vivianite-type minerals and active sulfidization fronts have been spatially separated over time. Experiments in which vivianite was subjected to sulfidic conditions demonstrate that incorporation of manganese or magnesium in vivianite does not affect its susceptibility to sulfide-induced dissolution. Our work highlights that post-depositional formation of iron(II) phosphates such as vivianite has the potential to strongly alter sedimentary P records particularly in systems that are subject to environmental perturbation, such as a change in primary productivity, which can be associated with a lake-marine transition.

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“…Given that the flooding of the Siberian shelf proved to have important effects on the climate in the Arctic, and in particular in the Nordic Seas, we want to compare our results in the following section with proxy estimates of sea-ice conditions and try to relate our found feedbacks of the Siberian shelf flooding to the reconstructed transgression of Bauch et al (2001) and Taldenkova et al (2010), which gives our simulated impacts a time frame from 9 ka, a dry shelf as in 9kOGSIB / 9kOGSIBGIS, to 7.5 ka BP, a flooded shelf as in 9kOG / 9kOGGIS.…”

Section: Discussionmentioning

confidence: 99%

“…Estimates for the Laptev Sea (i.e. a shelf not covered by ice sheets during the last glacial), illustrate the rapid rise in the sea level in the Arctic, from 31 m to 7 m below the present level between 8.9 ka BP and 7.5 ka BP (Taldenkova et al, 2010;Bauch et al, 2001), leading to a completely flooded shelf at 5 ka BP. A tentative extrapolation of these sea level stands to other shallow seas in the Arctic suggests that large areas were affected by similar flooding during the early Holocene, such as the large shelf areas in the East Siberian (National Geophysical Data Center, 2001) in the Arctic and 9 ka BP ICE5G ice mask from Peltier (2004).…”

Section: Introductionmentioning

confidence: 99%

The impact of early Holocene Arctic shelf flooding on climate in an atmosphere–ocean–sea–ice model

Blaschek¹,

Renssen²

2013

Clim. Past

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Abstract. Glacial terminations are characterized by a strong rise in sea level related to melting ice sheets. This rise in sea level is not uniform all over the world, because regional effects (uplift and subsidence of coastal zones) are superimposed on global trends. During the early Holocene the Siberian Shelf became flooded before 7.5 ka BP and the coastline reached modern-day high stands at 5 ka BP. This area is currently known as a sea-ice production area and contributes significantly to the sea-ice exported from the Arctic through the Fram Strait. This leads to the following hypothesis: during times of rising sea levels, shelves become flooded, increasing sea-ice production on these shelves, increasing sea-ice volume and export through the Fram Strait and causing the sea-ice extent to advance in the Nordic Seas, yielding cooler and fresher sea surface conditions. We have tested this hypothesis in an atmosphere-ocean-sea-ice coupled model of intermediate complexity (LOVECLIM). Our experiment on early Holocene Siberian Shelf flooding shows that in our model sea-ice production in the Northern Hemisphere increases (15 %) and that sea-ice extent in the Northern Hemisphere increases (14 %) but sea-ice export decreases (−15 %) contrary to our hypothesis. The reason of this unexpected behaviour has its origin in a weakened polar vortex, induced by the land-ocean changes due to the shelf flooding, and a resulting decrease of zonality in the Nordic Seas pressure regime. Hence the winter Greenland high and the Icelandic low strengthen, yielding stronger winds on both sides of the Nordic Seas. Increased winds along the East Greenland Current support local sea-ice production and transport towards the South, resulting in a wider sea-ice cover and a southward shift of convection areas. The overall strength of the Atlantic meridional overturning circulation is reduced by 4 % and the heat transport in the Atlantic basin by 7 %, resulting in an annual cooling pattern over the Nordic Seas by up to −4 • C. We find that the flooding of the Siberian shelf resulting from an orbitally induced warming and related glacioeustatic sea level rise causes a Nordic Seas cooling feedback opposed to this warming.

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History of ice-rafting and water mass evolution at the northern Siberian continental margin (Laptev Sea) during Late Glacial and Holocene times

Cited by 42 publications

References 72 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

Post-depositional formation of vivianite-type minerals alters sediment phosphorus records

The impact of early Holocene Arctic shelf flooding on climate in an atmosphere–ocean–sea–ice model

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