Early to middle Holocene changes in Laptev Sea water masses deduced from diatom and aquatic palynomorph assemblages

Polyakova, Ye. I.; Bauch, Henning A.; Klyuvitkina, T. S.

doi:10.1016/j.gloplacha.2004.12.014

Cited by 32 publications

(16 citation statements)

References 39 publications

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“…However, findings of the well-preserved dinoflagellate cyst Operculodinium centrocarpum in core sediments of PS-51/135-4 correspondent to the time interval 11.2-10.5 cal. ka (Polyakova et al, 2005), support the assumption that Atlantic waters influenced this part of the Laptev Sea shelf in Early Holocene times.…”

Section: Holocene Palaeoenvironmental Evolutionsupporting

confidence: 77%

“…Bottom water salinity during this time might be estimated to about 18-20, a value which is deduced when comparing the fossil benthic assemblages with the modern nearshore faunal community. The inference of a near-shore environment is corroborated from surface salinities calculated on the basis of freshwater diatoms, which indicate a salinity between 7 and 9, as well as the time-coeval occurrence of organic-walled freshwater algae (Polyakova et al, 2005).…”

Section: Holocene Palaeoenvironmental Evolutionmentioning

confidence: 71%

“…In the Yana palaeovalley, an evident spike in the abundance of freshwater diatoms is recorded for the time span 11.1-10.7 cal. ka (Polyakova et al, 2005), coincident with the establishment of the inner-shelf benthic assemblage. Given the earlier timing of environmental changes at site PS-51/135-4 compared to PS-51/138-12, an enhanced flux of freshwater diatoms might be assumed for the Lena palaeovalley around c. 10.9-10.5 cal.…”

Section: Holocene Palaeoenvironmental Evolutionmentioning

confidence: 93%

“…This interpretation gains support from the presence of dinoflagellate cysts between 10.7 and 9.2 cal. ka, which are typically being associated with Atlantic water masses (Polyakova et al, 2005).…”

Section: Holocene Palaeoenvironmental Evolutionmentioning

confidence: 99%

See 3 more Smart Citations

Last postglacial environmental evolution of the Laptev Sea shelf as reflected in molluscan, ostracodal, and foraminiferal faunas

Taldenkova

Bauch

Stepanova

et al. 2005

Global and Planetary Change

Self Cite

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Section: Holocene Palaeoenvironmental Evolutionsupporting

confidence: 77%

Section: Holocene Palaeoenvironmental Evolutionmentioning

confidence: 71%

Section: Holocene Palaeoenvironmental Evolutionmentioning

confidence: 93%

Section: Holocene Palaeoenvironmental Evolutionmentioning

confidence: 99%

See 2 more Smart Citations

Last postglacial environmental evolution of the Laptev Sea shelf as reflected in molluscan, ostracodal, and foraminiferal faunas

Taldenkova

Bauch

Stepanova

et al. 2005

Global and Planetary Change

Self Cite

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“…Several analytical approaches can lead to such evidence. High concentrations of freshwater diatoms and aquatic palynomorphs versus marine species in sediments from Siberian shelves have been shown to reflect the proximity of a terrestrial freshwater source [68,69]. Hydrogen isotopes (dD) of shortchain biogenic compounds (n-alkane n-C 17 ) were used to infer information on salinity changes in the Arctic Ocean at *55 Ma, during the so-called Paleocene/Eocene Thermal Maximum [64].…”

Section: Detection Of Freshwater Events In Arctic Historymentioning

confidence: 99%

The role of Arctic Ocean freshwater during the past 200 ky

Spielhagen

Bauch

2015

Arktos

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As part of the hydrologic cycle, the freshwater system plays a pivotal role for the Arctic Ocean. It maintains the strong stratification in the upper waters and fosters the formation of sea ice on the circum-Arctic shelves from where the ice is being exported toward Fram Strait and into the Nordic Seas. Recent projections of climate change under the greenhouse effect predict severe changes for the hydrologic cycle in the Arctic. This manuscript reviews the current knowledge of past changes in freshwater fluxes to and from the Arctic Ocean and their possible impact on ocean circulation and climate outside the Arctic during the past 200,000 years. It becomes evident that abrupt and large-volume discharges into the Arctic Ocean during times of major climate transitions were capable of disturbing the global ocean circulation and triggering further climate change, e.g., at the onset of the Younger Dryas cold event. During sea-level rise in the Holocene, a connection between the increasing areas available for sea ice formation, the position of the ice margin in the ice export area (the Fram Strait) and the deepwater convection in the Greenland Sea is suggested. Further work is needed to investigate the effects of other catastrophic freshwater discharges from previously ice-dammed lakes in northern Eurasia during the Weichselian and Saalian glaciations. Events like the 8.2 ka and the Younger Dryas, which were associated with flooding and routing of glacial meltwaters and had a significant effect on climate, could serve as a template to better validate the impact of similar occurrences in the past. To date, the actual influence of the earlier events on ocean circulation and climate remains elusive.

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The Global Thermohaline Paleocirculation

Иванова¹

2009

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Early to middle Holocene changes in Laptev Sea water masses deduced from diatom and aquatic palynomorph assemblages

Cited by 32 publications

References 39 publications

Last postglacial environmental evolution of the Laptev Sea shelf as reflected in molluscan, ostracodal, and foraminiferal faunas

Last postglacial environmental evolution of the Laptev Sea shelf as reflected in molluscan, ostracodal, and foraminiferal faunas

The role of Arctic Ocean freshwater during the past 200 ky

The Global Thermohaline Paleocirculation

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