Chapter 5: &lt;italic&gt;East Siberia (Based on data obtained mainly in Central Yakutia)&lt;/italic&gt;

Fradkina, A.F.; Alekseev, M.N.; Andreev, Andrei A.; Климанов, В. А.

doi:10.1130/0-8137-2382-5.89

Cited by 13 publications

(19 citation statements)

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“…Most remarkable is the sharp increase in ostracod and ephippia abundance (LU2 in Figure 5), which suggests that rapid lake growth led to optimum conditions for the studied lacustrine faunae within a few decades. According to Fradkina et al (2005), one phase of maximal climate warming during the mid-Holocene was reached during ~6400-6000 cal. yr BP with annual temperatures ⩽1.5°C higher and precipitation greater than today.…”

Section: Discussionmentioning

confidence: 99%

“…The mid-Holocene climate optimum (roughly between 6700 and 5000 cal. yr BP) in Central Yakutia (CY; Andreev et al, 2002; Nazarova et al, 2013) is of special interest because climate conditions and related environmental changes are at least partly comparable with those expected for the 21st century (Fradkina et al, 2005; Intergovernmental Panel on Climate Change (IPCC), 2013; Monserud et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia

et al. 2017

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The reconstruction of Holocene thermokarst landform evolution is important to understand the potential impact of current global climate change on permafrost regions. A multi-proxy approach was applied to analyse the sedimentological and biogeochemical characteristics as well as pollen and lacustrine microfossils of a core profile drilled in a small pingo within a large Central Yakutian thermokarst basin (alas). Age–depth modelling with macrofossil 14C ages reveals high thermokarst deposit sedimentation rates and a complete thermokarst sequence spanning about 900 years during the mid-Holocene between ~6750 and 5870 cal. yr BP. In total, three stages of thermokarst landscape evolution have been identified. Thermokarst processes were initiated at ⩽6750 to 6500 cal. yr BP. Terrestrial conditions changed quickly to lacustrine conditions, and a thermokarst lake rapidly emerged and grew to an estimated size of 120–600 m diameter and 7.5–15 m depth during only ~150 years between ~6500 and 6350 cal. yr BP. The decline of thermokarst processes and lake decrease may have been affected by local hydrological conditions between ~6350 and 5870 cal. yr BP but ceased completely after 5870 cal. yr BP, likely due to climatic changes. Clear evidence for long-lasting and stable lacustrine conditions was not obtained. The study emphasises that short-term warming led to very active permafrost degradation and rapid but locally variable modification of alas and thermokarst evolution.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia

et al. 2017

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“…The formation of the lake basin possibly started sometime between 15.0 and 10.0 ka BP, a time which was characterized by postglacial temperature rise and melting processes in permafrost over eastern Siberia (Baulin and Danilova, 1984;Schirrmeister et al, 2011;Biskaborn et al, 2012). At the same time, steppe vegetation in central Yakutia was gradually declining and being replaced by the spread of larch and birch forests with pine and spruce along river valleys (Andreev et al, 1997;Fradkina et al, 2005;Andreev and Tarasov, 2007;Müller et al, 2009).…”

Section: Early Holocene (100e80 Ka Bp)mentioning

confidence: 99%

“…In three different areas, the northern Ural, the Taimyr Peninsula, and the Lena Delta, temperatures appear relatively high during the early to middle Holocene (Andreev et al, 2003). The investigations of Kremenetski (1996) on Fadeyevsky Island, of Andreev et al (2001Andreev et al ( , 2002Andreev et al ( , 2004aAndreev et al ( , 2004b and Anderson et al (2002) in Northern Siberia, Fradkina et al (2005) in central Yakutia and Koshkarova and Koshkarov (2004) in northern Central Siberia, and Biskaborn et al (2012) in the region close to Lena Delta ascertained the climate optimum in comparable periods for several regions from Central to Northern Siberia, although there is also evidence for warmer to warmest periods occurring in the Early Holocene (Pisaric et al, 2001;. The palynological data from higharctic Holocene sediments of the Kara Sea region Serebryanny et al, 1998) clearly identify the Holocene climatic optimum between 6 and 4 ka Serebryanny et al, 1998).…”

Section: Regional Comparisonmentioning

confidence: 99%

Holocene climate conditions in central Yakutia (Eastern Siberia) inferred from sediment composition and fossil chironomids of Lake Temje

Nazarova

Lüpfert

Subetto

et al. 2013

Quaternary International

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a b s t r a c tA 380 cm long sediment core from Lake Temje (central Yakutia, Eastern Siberia) was studied to infer Holocene palaeoenvironmental change in the extreme periglacial setting of eastern Siberia during the last 10,000 years. Data on sediment composition were used to characterize changes in the depositional environment during the ontogenetic development of the Lake Temje. The analysis of fossil chironomid remains and statistical treatment of chironomid data by the application of a newly developed regional Russian transfer functions provided inferences of mean July air temperatures (T July ) and water depths (WD). Reconstructed WDs show minor changes throughout the core and range between 80 and 120 cm. All the fluctuations in reconstructed water depth lie within the mean error of prediction of the inference model (RMSEP ¼ 0.35) so it is not possible to draw conclusions from the reconstructions. A qualitative and quantitative reconstruction of Holocene climate in central Yakutia recognized three stages of palaeoenvironmental changes. The early Holocene between 10 and 8 ka BP was characterized by colderthan-today and moist summer conditions. Cryotextures in the lake sediments document full freezing of the lake water during the winter time. A general warming trend started around 8.0 ka BP in concert with enhanced biological productivity. Reconstructed mean T July were equal or up to 1.5 C higher than today between 6.0 ka and 5.0 ka BP. During the entire late Holocene after 4.8 ka BP, reconstructed mean T July remained below modern value. Limnological conditions did not change significantly. The inference of a mid-Holocene climate optimum supports scenarios of Holocene climatic changes in the subpolar part of eastern Siberia and indicates climate teleconnections to the North Atlantic realm.

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“…w = widespread. For consistency and ease of comparison the numbered references and explanatory notes for the BLB and the NALB here are the same as those used for all the land bridges as treated in Graham (2010, appendix 2): Beringia ‐ 1 Budantsev, ; 2 Penhallow, ; 3 LaMotte, ; 5 Heer, ; 6 Chaney, ; 7 Lesquereux, ; 11 Heer, ; 14 Manchester et al, ; 16 Golovneva, ; 17 Stockey et al, ; 21 Budantsev, ; 22 Lavrenko & Fot'janova, ; 24 Vakhrameev, ; 25 Zhilin, ; 26 Velichko et al, ; 27 Arkhipov et al, ; 28 Fradkina et al, , ; 29 Akhmetiev, ; 30 Pavlyutkin & Chekryzhov, ; 35 Wolfe et al, ; 36 Stockey et al, ; 37 Wolfe, 1977; 38 Vakhrameev, ; 39 Pigg et al, ; 40 Harris et al, ; 41 Piel, ; 42 Wolfe & Tanai, ; 43 Becker, ; 44 Leopold & Liu, ; 45 Wolfe & Tanai, ; 46 Reinink‐Smith & Leopold, ; 47 Chelebaeva, ; 48 Pound et al, ; 51 Moiseeva et al, ; 52 Takhtajan et al, et seq. ; 53 McIver & Basinger, ; 54 Bell, .…”

Section: Introductionmentioning

confidence: 99%

The role of land bridges, ancient environments, and migrations in the assembly of the North American flora

Graham

2018

J of Sytematics Evolution

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Continental‐scale assembly of floras results from past and present in situ diversification in association with several external processes. Among these processes are the making and breaking of connections among landmasses. Connections among landmasses are constantly in flux as are the climates and landscapes along the connection corridors, so that these corridors, or land bridges, may either facilitate or restrict migration at a given time. Across land bridges, changing landscape‐level and organismal factors include the dispersal potential and vectors of propagules, competition, predation, and distributions altered by pathogens. Assembly of a flora is, therefore, the outcome of complex, interacting, temporally‐varying factors that render simplistic explanations unlikely. In the case of North America, the continent experienced ephemeral connections with adjacent regions via five land bridges over the last 100 Ma at different times and under different climates and specific landscape morphologies, including edaphic characteristics. Here, I emphasize the earliest of these connections, Beringia, which probably comprised an initially‐incomplete land bridge during the Cretaceous and Paleocene resulting from compression, fragmentation, and rotation of Asian‐North American sub‐blocks as North America began moving westward from the northern portion of the Mid‐Atlantic Ridge. During the same time, additional land was added to Beringia with accretion of terranes and the subduction of the northern edge of the Pacific Plate beneath the North American‐Asian Plates in the Eocene to form the Aleutian Islands. Other connections between North America and adjacent landmasses were the North Atlantic, the Antilles, Central America, and the Magellan land bridge.

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Chapter 5: <italic>East Siberia (Based on data obtained mainly in Central Yakutia)</italic>

Cited by 13 publications

References 0 publications

Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia

Rapid thermokarst evolution during the mid-Holocene in Central Yakutia, Russia

Holocene climate conditions in central Yakutia (Eastern Siberia) inferred from sediment composition and fossil chironomids of Lake Temje

The role of land bridges, ancient environments, and migrations in the assembly of the North American flora

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