Environmental evolution of the southern Chukchi Sea in the Holocene

Гусев, Е. А.; Anikina, Natalya; Derevyanko, L. G.; Klyuvitkina, T. S.; Polyak, L. V.; Polyakova, E. I.; Rekant, P.; Stepanova, A.

doi:10.1134/s0001437014030011

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…To facilitate the interpretation along these lines, we show the downcore distribution of several palynological indices including the ratio of herb to tree pollen, freshwater to terrestrial palynomorphs, and marine to non-marine (freshwater plus terrestrial) palynomorphs (Figure 5; Supplement 1, available online). With some variations, similar characteristics have been used in marine palynological studies, such as a freshwater to marine palynomorph ratio, also known as a CD (chlorophycean to dinoflagellate cyst) index (Gusev et al, 2014; Matthiessen et al, 2000). In addition to concentrations per gram sediment shown in Figure 3, we estimated influx of terrestrial palynomorphs (spores and pollen) for both cores based on grain concentrations, linear sedimentation rates between the 14 C age points, and average Holocene wet sediment bulk density and water content (Figure 5a).…”

Section: Discussionmentioning

confidence: 99%

“…Contribution from the Anadyr River on the Siberian side of the Bering Sea is unlikely because of the absence of Larix or Siberian pine pollen, which is consistent with the circulation pattern as the Yukon outflow is deflected eastwards after passing the Bering Strait. While Larix is generally rare in marine sediments because of its fragility, pollen assemblages in cores from the southwestern Chukchi shelf contain small amounts of Siberian pine, for a comparison (Gusev et al, 2009(Gusev et al, , 2014. The transport of material from the Yukon River discharge to the Chukchi-Alaskan margin is corroborated by the composition of organic matter in surficial sediment from this area that has a high content of terrestrial biomarkers indicative of higher plants, as opposed to mostly soil-derived terrestrial component of high-Arctic rivers (Goñi et al, 2013).…”

Section: Middle-to Late-holocenementioning

confidence: 99%

“…Matthiessen et al, 2000;Naidina and Bauch, 2011;Rudenko et al, 2014). Recently, Gusev et al (2009Gusev et al ( , 2014 used terrestrial and aquatic palynomorphs to characterize Holocene sedimentary and associated climatic environments in the southwestern part of the Chukchi Sea. Results indicate a potential usefulness of these proxies for paleoceanographic interpretation and correlation of sediment cores and the need for more studies to comprehend the regional climate change.…”

Section: Introductionmentioning

confidence: 99%

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Terrestrial and aquatic palynomorphs in Holocene sediments from the Chukchi–Alaskan margin, western Arctic Ocean: Implications for the history of marine circulation and climatic environments

2016

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Two sediment cores from the Chukchi Sea margin north of Alaska were analyzed for palynological composition including terrestrial and aquatic palynomorphs. Based on 13 radiocarbon ages, the investigated sedimentary record represents most of the Holocene with a century to multidecadal age resolution. Three palynological zones were discriminated based on the abundance of major palynomorph groups (terrestrial and freshwater palynomorphs and dinoflagellate cysts) and composition of spore and pollen assemblages. They are interpreted in terms of depositional and paleoclimatic changes including predominance of redeposition by meltwater or sea ice in the early-Holocene, a strong input of contemporaneous material related to Pacific water advection culminating after ca. 6000 yr BP, and more subtle changes in the late-Holocene. It is concluded that depositional environments, such as current transportation and mixing, have an overall major control on palynomorph distribution. The climatic factors may have also played an important role in palynomorph abundance and composition, especially in the middle- to late-Holocene, when circulation changes were less dramatic than during the flooding of the Bering Strait and the shallow Chukchi Sea shelf. Comprehending these linkages requires a better knowledge of the Holocene vegetation history in the coastal areas of Alaska and Chukchi Peninsula.

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Section: Discussionmentioning

confidence: 99%

Section: Middle-to Late-holocenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Terrestrial and aquatic palynomorphs in Holocene sediments from the Chukchi–Alaskan margin, western Arctic Ocean: Implications for the history of marine circulation and climatic environments

2016

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“…Темпы современного осадконакопления по изотопному 210 Pb датированию в разных районах Чукотского моря изменяются от 0.5 до 5.4 мм/год [Baskaran, Naidu, 1995;Ma et al, 2008;Fox et al, 2014]. Несколько меньшие темпы осадконакопления (0.1-0.7 мм/год) получены по результатам радиоуглеродного датирования верхних 1-2 м слоев отложений южной части Чукотского моря [Gusev et al, 2014]. Установленная нами скорость современ-ной седиментации лучше согласуется с этими данными.…”

Section: Discussionunclassified

Late Holocene Sedimentation in Active Geological Structures of the Chukchi Sea

Вологина¹,

Калугин²,

Дарин³

et al. 2018

Geodin. tektonofiz.

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The article presents the detailed analysis results considering bottom sediments from the Chukchi Sea. Two core samples, b16 and НС-8 were taken from the northern Herald Canyon 150 km northeast from NE Wrangel Island. Core b16 has been studied in more detail. According to the 210 Pb measurements, the recent sedimentation rate amounts to 0.9 mm/y-1 at the sampling point. In the bottom layer of the core sample, the minimum concentrations of biogenic components (SiO2bio, Corg, Ntot, and Br) and the increased concentrations of cold-water diatom species Thalassiosira antarctica may result from low biological productivity during the Maunder Minimum. A correlation with recent global warming (11-22 years) is shown by the increased concentrations of SiO2bio, Corg, Ntot, and Br and the decreased values of magnetic susceptibility and X-ray density in the top layer (1-2 cm) of the same core sample. The results of our geochemical and diatom analysis support the available literature data and confirm that the Late Holocene sedimentation in the Chukchi Sea takes place in the zone wherein the water transits from the Pacific to the Arctic Ocean.

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“…During this period, there were substantial changes in Bering Strait water exchange (Woodgate and Aagaard, 2005) and the melting of sea ice in the Chukchi Sea, which led to new water mass patterns in the Chukchi Sea. The bottom sediments (0-2 cm of the surface layer) covered a prolonged time interval, from the first decades in the southern and southwestern parts with a high sedimentation rate (Gusev et al, 2014) to hundreds of years in the northern part of the Chukchi Sea. This may explain why there is not complete concurrence in the records of the water masses in the Chukchi Sea and the geochemical features of sediments and diatom thanatocoenoses.…”

Section: Discussionmentioning

confidence: 99%