Chronology of the Holocene transgression at the North Siberian margin

Bauch, Henning A.; Mueller-Lupp, Thomas; Taldenkova, E.; Spielhagen, Robert F.; Kassens, Heidemarie; Grootes, P. M.; Thiede, Jörn; Heinemeier, Jan; Petryashov, V. V.

doi:10.1016/s0921-8181(01)00116-3

Cited by 270 publications

(268 citation statements)

References 35 publications

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“…1B and 11C). This erosive event could not be dated directly but we assume it occurred during the strong Lateglacial landscape transformation, when thermokarst processes (Romanovskii et al, 2000) and the postglacial shelf transgression (Bauch et al, 2001) started to transform the regional hydrological system of the shelf landscape. In addition, neotectonic events (Are and Reimnitz, 2000) probably affected the environmental dynamics.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

Late Quaternary paleoenvironmental records from the western Lena Delta, Arctic Siberia

Schirrmeister

Grosse

Schnelle

et al. 2011

Palaeogeography, Palaeoclimatology, Palaeoecology

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The three main Lena Delta terraces were formed during different stages of the late Quaternary. While only the first floodplain terrace is connected with active deltaic processes, the second and third terraces, which dominate the western part of the delta, are erosional remnants of arctic paleolandscapes affected by periglacial processes. The landscape dynamics of the second and the third terraces, and their relationship to each other, are of particular importance in any effort to elucidate the late Quaternary paleoenvironment of western Beringia. Multidisciplinary studies of permafrost deposits on the second terrace were carried out at several sites of the Arga Complex, named after the largest delta island, Arga-Muora-Sise. The frozen sediments predominantly consist of fluvial sands several tens of meters thick, radiocarbon-dated from N 52 to 16 kyr BP. These sands were deposited under changing fluvial conditions in a dynamic system of shifting river channels, and have been additionally modified by synsedimentary and postsedimentary cryogenesis. Later thermokarst processes affected this late Pleistocene fluvial landscape during the Lateglacial and the Holocene. In addition, eolian activity reworked the fluvial sands on exposed surfaces at least since the Lateglacial, resulting in dune formation in some areas. Contrary to the Arga Complex, the third terrace is mainly composed of polygenetic alluvial and proluvial ice-rich permafrost sequences (Ice Complex deposits) radiocarbon-dated from 50 to 17 kyr BP which cover older fluvial sand units luminescence-dated to about 100-50 kyr BP. Paleoecological records reflect tundra-steppe conditions that varied locally, depending on landscape dynamics, during the Marine Isotope Stage (MIS) 4 and 3 periods, and a persistent change to shrub and arctic tundra during Lateglacial and Holocene periods. The study results indicate a continuous fluvial sedimentation environment for the Laptev Sea shelf in the region of the second Lena Delta terrace during the late Pleistocene, and confirm the presence of a dynamic channel system of the paleo-Lena River that flowed at the same time as the nearby subaerial Ice Complex deposits were being formed.

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Section: Discussion and Interpretationmentioning

confidence: 99%

Late Quaternary paleoenvironmental records from the western Lena Delta, Arctic Siberia

Schirrmeister

Grosse

Schnelle

et al. 2011

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…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: 95%

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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“…We therefore conclude that conditions for large-area thermokarst lake development were more suitable in the past. During the massive thermokarst development in this region about 12 ka ago the coastline was situated hundreds of kilometers to the north of its present location (Bauch et al, 2001;Kaplina, 2009). The study area was not part of a river delta, but of a broad accumulation plain where Ice Complex deposits were distributed widely (Schirrmeister et al, 2011a).…”

Section: Areal Constraints On Thermokarst Developmentmentioning

confidence: 99%

“…Morgenstern et al: Spatial analyses of thermokarst lakes and basins in Yedoma landscapes of the Lena Delta single orienting factor is thus only acceptable if a summer cloud-cover regime with consistently higher cloudiness in the afternoon were to be observed on Kurungnakh Island. Wind data from the meteorological station on Stolb Island near Kurungnakh Island (72.4 • E 126.5 • N, data from 1955-1991 show pronounced southern wind directions for the whole observation period and three peaks for the period of positive temperatures, one from the S, one from the ESE, and one from the NNW (Morgenstern et al, 2008a). This would support the hypothesis of orientation due to prevailing winds in the direction of major axes for the lakes of Kurungnakh Island over the last 40 years.…”

Section: Oriented Thermokarst Developmentmentioning

confidence: 99%

Spatial analyses of thermokarst lakes and basins in Yedoma landscapes of the Lena Delta

et al. 2011

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Abstract. Distinctive periglacial landscapes have formed in late-Pleistocene ice-rich permafrost deposits (Ice Complex) of northern Yakutia, Siberia. Thermokarst lakes and thermokarst basins alternate with ice-rich Yedoma uplands. We investigate different thermokarst stages in Ice Complex deposits of the Lena River Delta using remote sensing and geoinformation techniques. The morphometry and spatial distribution of thermokarst lakes on Yedoma uplands, thermokarst lakes in basins, and thermokarst basins are analyzed, and possible dependence upon relief position and cryolithological context is considered. Of these thermokarst stages, developing thermokarst lakes on Yedoma uplands alter ice-rich permafrost the most, but occupy only 2.2 % of the study area compared to 20.0 % occupied by thermokarst basins. The future potential for developing large areas of thermokarst on Yedoma uplands is limited due to shrinking distances to degradational features and delta channels that foster lake drainage. Further thermokarst development in existing basins is restricted to underlying deposits that have already undergone thaw, compaction, and old carbon mobilization, and to deposits formed after initial lake drainage. Future thermokarst lake expansion is similarly limited in most of Siberia's Yedoma regions covering about 10 6 km 2 , which has to be considered for water, energy, and carbon balances under warming climate scenarios.

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Chronology of the Holocene transgression at the North Siberian margin

Cited by 270 publications

References 35 publications

Late Quaternary paleoenvironmental records from the western Lena Delta, Arctic Siberia

Late Quaternary paleoenvironmental records from the western Lena Delta, Arctic Siberia

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

Spatial analyses of thermokarst lakes and basins in Yedoma landscapes of the Lena Delta

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