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  • 1
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    Late Quaternary paleoenvironmental reconstructions from sediments of Lake Emanda (Verkhoyansk Mountains, East Siberia) (2022)
    Andreev, Andrei A. ; Nazarova, Larisa B. ; Lenz, Marlene M. ; [et al.]
    Details
    Publication Date: 2022-09-27
    Description: Continuous pollen and chironomid records from Lake Emanda (65°17′N, 135°45′E) provide new insights into the Late Quaternary environmental history of the Yana Highlands (Yakutia). Larch forest with shrubs (alders, pines, birches) dominated during the deposition of the lowermost sediments suggesting its Early Weichselian [Marine Isotope Stage (MIS) 5] age. Pollen‐ and chironomid‐based climate reconstructions suggest July temperatures (TJuly) slightly lower than modern. Gradually increasing amounts of herb pollen and cold stenotherm chironomid head capsules reflect cooler and drier environments, probably during the termination of MIS 5. TJuly dropped to 8 °C. Mostly treeless vegetation is reconstructed during MIS 3. Tundra and steppe communities dominated during MIS 2. Shrubs became common after ~14.5 ka bp but herb‐dominated habitats remained until the onset of the Holocene. Larch forests with shrub alder and dwarf birch dominated after the Holocene onset, ca. 11.7 ka bp. Decreasing amounts of shrub pollen during the Lateglacial are assigned to the Older Dryas and Younger Dryas with TJuly ~ 7.5 °C. TJuly increased up to 13 °C. Shrub stone pine was present after ~7.5 ka bp. The vegetation has been similar to modern since ca. 5.8 ka bp. Chironomid diversity and concentration in the sediments increased towards the present day, indicating the development of richer hydrobiological communities in response to the Holocene thermal maximum.
    Description: Russian Scientific Foundation
    Description: German Federal Ministry of Education and Research
    Description: European Research Council http://dx.doi.org/10.13039/501100000781
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: RSF
    Description: Russian Ministry of Education and Science
    Description: Federal Ministry of Education and Research
    Description: BMBF
    Keywords: ddc:560
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Palaeoenvironmental investigations and reconstructions in Northern Russia using subfossil Cladocera (Branchiopoda, Crustacea) (2014)
    Wissenschaftliche Verlagsges.
    In:  Nova Acta Leopoldina, N.F. 117 (399). pp. 173-176.
    Details
    Publication Date: 2016-01-21
    Type: Article , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 3
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    Some limnological characteristics of studied lakes in the Siberian arctic (2013)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: AWI Arctic Land Expedition; Bolshoy Lyakhovsky Island, East Siberia, Russia; Conductivity; Date/Time of event; DEPTH, water; Event label; LAP-01d; LAP-02; LAP-03; LAP-04; LAP-05; LAP-06; LAP-07; LAP-08; LAP-09; LAP-10; LAP-11; LAP-12; LAP-13; LAP-14; LAP-15; LAP-16a; LAP-17; LAP-18; LAP-19; LAP-20; LAP-21; LAP-22; LAP-23; LAP-24; LAP-25; LAP-26; LAP-27; LAP-28; LAP-29; LAP-31; LAP-32; LAP-35; LAP-36; LAP-37; Latitude of event; Lena2007; Location of event; Longitude of event; near Tiksi, East Siberia, Russia; Oyogos Yar, East Siberia, Russia; pH; RU-Land_2007_Lena; Sample code/label; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 102 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Sedimentology, biogeochemistry stable isotopes, pollen, plant macrofossils, and diatoms from two sediments cores from the northern Yukon permafrost peatlands (Canada) (2016)
    PANGAEA
    In:  Supplement to: Fritz, Michael; Wolter, Juliane; Rudaya, Natalia; Palagushkina, Olga V; Nazarova, Larisa B; Obu, Jaroslav; Rethemeyer, Janet; Lantuit, Hugues; Wetterich, Sebastian (2016): Holocene ice-wedge polygon development in northern Yukon permafrost peatlands (Canada). Quaternary Science Reviews, 147, 279-297, https://doi.org/10.1016/j.quascirev.2016.02.008
    Details
    Publication Date: 2023-03-07
    Description: Ice-wedge polygon (IWP) mires in the Arctic and Subarctic are extremely vulnerable to climatic and environmental change. We present the results of a multidisciplinary paleoenvironmental study on IWPs in the northern Yukon, Canada. High-resolution laboratory analyses were carried out on a permafrost core and the overlying seasonally thawed (active) layer, from a low-centered IWP located in a drained lake basin on Herschel Island. In relation to 14 Accelerator Mass Spectrometry (AMS) radiocarbon dates spanning the last 5000 years, we report sedimentary data including grain size distribution and biogeochemical parameters (organic carbon, nitrogen, C/N ratio, d13C), stable water isotopes (d18O, dD), as well as fossil pollen, plant macrofossil and diatom assemblages. Three sediment units (SUs) correspond to the main stages of deposition (1) in a thermokarst lake (SU1: 4950 to 3950 cal yrs BP), (2) during transition from lacustrine to palustrine conditions after lake drainage (SU2: 3950 to 3120 cal yrs BP), and (3) in palustrine conditions in the IWP field that developed after drainage (SU3: 3120 cal yrs BP to AD 2012). The lacustrine phase (pre 3950 cal yrs BP) is characterized by planktonic-benthic and pioneer diatoms species indicating circumneutral waters, and very few plant macrofossils. The pollen record has captured a regional signal of relatively stable vegetation composition and climate for the lacustrine stage of the record until 3950 cal yrs BP. Palustrine conditions with benthic and acidophilic species characterize the peaty shallow-water environments of the low-centered IWP. The transition from lacustrine to palustrine conditions was accompanied by acidification and rapid revegetation of the lake bottom within about 100 years. Since the palustrine phase we consider the pollen record as a local vegetation proxy dominated by the plant communities growing in the IWP. Ice-wedge cracking in water-saturated sediments started immediately after lake drainage at about 3950 cal yrs BP and led to the formation of an IWP mire. Permafrost aggradation through downward closed-system freezing of the lake talik is indicated by the stable water isotope record. The originally submerged IWP center underwent gradual drying during the past 2000 years. This study highlights the sensitivity of permafrost landscapes to climate and environmental change throughout the Holocene.
    Keywords: AWI_PerDyn; Permafrost Research (Periglacial Dynamics) @ AWI
    Type: Dataset
    Format: application/zip, 7 datasets
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    DATA PANGAEA
  • 5
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    Multi-proxy records of Two-Yurts Lake (2015)
    PANGAEA
    In:  Supplement to: Hoff, Ulrike; Biskaborn, Boris K; Dirksen, Veronika G; Dirksen, Oleg V; Kuhn, Gerhard; Meyer, Hanno; Nazarova, Larisa B; Roth, Alexandra; Diekmann, Bernhard (2015): Holocene environment of Central Kamchatka, Russia: Implications from a multi-proxy record of Two-Yurts Lake. Global and Planetary Change, 134, 101-117, https://doi.org/10.1016/j.gloplacha.2015.07.011
    Details
    Publication Date: 2023-03-07
    Description: Within the scope of Russian-German palaeoenvironmental research, Two-Yurts Lake (TYL, Dvuh-Yurtochnoe in Russian) was chosen as the main scientific target area to decipher Holocene climate variability on Kamchatka. The 5x2 km large and 26 m deep lake is of proglacial origin and situated on the eastern flank of Sredinny Ridge at the northwestern end of the Central Kamchatka Valley, outside the direct influence of active volcanism. Here, we present results of a multi-proxy study on sediment cores, spanning about the last 7000 years. The general tenor of the TYL record is an increase in continentality and winter snow cover in conjunction with a decrease in temperature, humidity, and biological productivity after 5000-4500 cal yrs BP, inferred from pollen and diatom data and the isotopic composition of organic carbon. The TYL proxy data also show that the late Holocene was punctuated by two colder spells, roughly between 4500 and 3500 cal yrs BP and between 1000 and 200 cal yrs BP, as local expressions of the Neoglacial and Little Ice Age, respectively. These environmental changes can be regarded as direct and indirect responses to climate change, as also demonstrated by other records in the regional terrestrial and marine realm. Long-term climate deterioration was driven by decreasing insolation, while the short-term climate excursions are best explained by local climatic processes. The latter affect the configuration of atmospheric pressure systems that control the sources as well as the temperature and moisture of air masses reaching Kamchatka.
    Keywords: AWI_PerDyn; Permafrost Research (Periglacial Dynamics) @ AWI
    Type: Dataset
    Format: application/zip, 12 datasets
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    DATA PANGAEA
  • 6
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    Distribution of diatoms in surface sediments and some limnological characteristics of studied lakes in the Siberian arctic
    PANGAEA
    In:  Supplement to: Palagushkina, Olga V; Nazarova, Larisa B; Wetterich, Sebastian; Schirrmeister, Lutz (2012): Diatoms of modern bottom sediments in Siberian arctic. Contemporary Problems of Ecology, 5(4), 413-422, https://doi.org/10.1134/S1995425512040105
    Details
    Publication Date: 2023-05-12
    Description: The investigation of the species composition and ecology of diatoms of modern bottom sediments in water bodies of arctic polygonal tundra in three subregions of North Yakutiya has been carried out. As a result, 161 taxons of diatoms were determined; the determinant role of the depth, conductivity, pH of the water, and geographic latitude in their distribution was confirmed, and two complexes of species with respect to the leading abiotic factors were distinguished. The diatoms of the first complex prefer shallow water bodies of high latitudes with neutral and slightly alkaline water and relatively high conductivity. The second complex is confined to the water bodies of lower latitudes with small conductivity, as well as neutral and slightly acidic water.
    Keywords: AWI_PerDyn; Permafrost Research (Periglacial Dynamics) @ AWI
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 7
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    Diversity indices of chironomid communites, Anabar region, Yakutia, Russia (2018)
    PANGAEA
    In:  Alfred Wegener Institute - Research Unit Potsdam
    Details
    Publication Date: 2023-02-12
    Keywords: 07-SA-01; 07-SA-02; 07-SA-03; 07-SA-05; 07-SA-06; 07-SA-07; 07-SA-08; 07-SA-09; 07-SA-10; 07-SA-11; 07-SA-13; 07-SA-14; 07-SA-15; 07-SA-16; 07-SA-17; 07-SA-18; 07-SA-20; 07-SA-21; 07-SA-22; 07-SA-23; 07-SA-24; 07-SA-25; 07-SA-26; 07-SA-27; 07-SA-28; 07-SA-29; 07-SA-30; 07-SA-31; 07-SA-32; 07-SA-33; 07-SA-34; 07-SA-35; AWI Arctic Land Expedition; Berger-Parker index; Comment of event; Date/Time of event; Dominance; Elevation of event; Equitability; Evenness of species; Event label; Fishers alpha index of diversity; Latitude of event; Longitude of event; Margalefs richness index; Menhinick's diversity index; MULT; Multiple investigations; RU-Land_2007_Saskylakh; Saskylakh2007; Saskylakh region (Sakha), Russia; Shannon Diversity Index; Simpson index of diversity; Station label; Taxa
    Type: Dataset
    Format: text/tab-separated-values, 352 data points
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    DATA PANGAEA
  • 8
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    (Table 1) Age determination of sediment core YC12-HP-Mc (2016)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated, range, maximum; Age, dated, range, minimum; Age, dated material; Age, dated standard deviation; AWI_PerDyn; AWI Arctic Land Expedition; CA-Land_2012_YukonCoast; Carbon mass; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Herschel Island, Yukon Territory, Canada; Mass spectrometry; PEATC; Peat corer; Permafrost Research (Periglacial Dynamics) @ AWI; Sample, optional label/labor no; Treatment; YC12-HP-Mc; Yukon_Coast_2012; δ13C
    Type: Dataset
    Format: text/tab-separated-values, 44 data points
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    DATA PANGAEA
  • 9
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    Taxonomic compositions of chironomids and results of chironomid-based PCA of sediment core 11-CH-12 (2016)
    PANGAEA
    In:  Alfred Wegener Institute - Research Unit Potsdam
    Details
    Publication Date: 2023-06-27
    Description: We studied a sediment core from the lake Khatanga-12 (Taimyr Peninsula, Krasnoyarsk region). The core is 131.5 cm long and covers a period of sedimentation of 7100 years. In this study we made a chironomid analysis and a qualitative reconstruction of paleoecological development of the region and quantitative reconstruction of mean-July air temperature and the water depth in the lake using Russian regional statistical chironomid-based climate-inference models (Nazarova et.al., 2008, 2011, 2015). The lake was formed during the mid-Holocene warming as a result of thermokarst processes. Development of the lake ecosystem Khatanga - 12 in various stages was influenced by climatic factors and cryolitogenic processes. Mid-Holocene warming around 7100 - 6500 calibrated years BP activated thermokarst processes and resulted in formation of the lake basin. Cooling was reconstructed between 6500 and 4500 cal. years BP. The sediments of the lake have been formed by the erosion processes of the lake banks. After 2500 cal. BP reconstructed conditions are close to modern.
    Keywords: 11-CH-12; AWI_PerDyn; AWI Arctic Land Expedition; Chatanga2011; Depth, relative; DEPTH, sediment/rock; EG; Ekman grab; Factor 1; Factor 2; Factor 3; Factor 4; Number; Permafrost Research (Periglacial Dynamics) @ AWI; Principal component analyses (PCA); RU-Land_2011_Khatanga
    Type: Dataset
    Format: text/tab-separated-values, 156 data points
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    DATA PANGAEA
  • 10
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    Multiproxy dataset from Lake Bolshoe Toko, Siberia (PG2208) (2022)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: We conducted field work at Lake Bolshoe Toko in the first week of April 2013 as part of the expedition “Yakutia 2013” as a joint campaign of the North Eastern Federal State University (NEFU, Russia, Yakutsk) and the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI, Germany, Potsdam). Coring equipment was brought by trucks onto the lake. We used a Jiffy ice auger (250 mm) to open holes through the 80 cm thick ice cover as conduits for scientific instruments and coring equipment to the unfrozen water column and bottom sediments. A portable Echo sounder (HONDEX PS-7 LCD) gave estimates of water depth and verified ambiguous values with a calibrated rope. We used UWITEC piston and gravity corer to retrieve sediment cores. Core PG2208 was retrieved by repeated coring of sub-sections at a water depth of 68.3 m. To avoid core loss due to the piston coring technique, parallel 3 m core sections were retrieved with an overlap of 0.5 m. Compaction was reduced by leaving the cores for tension release for several hours after retrieval.
    Keywords: AWI_Envi; AWI Arctic Land Expedition; COMPCORE; Composite Core; diatoms; Lake Bolshoe Toko, Yakutia, Russia; Lake sediment core; lake sediment proxies; Paleo Modelling; PalMod; PG2208; Polar Terrestrial Environmental Systems @ AWI; RU-Land_2013_Yakutia; Siberia; Siberian Arctic; Yakutia2013
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
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