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  • 1
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    Characterizing hydrological processes within kettle holes using stable water isotopes in the Uckermark of northern Brandenburg, Germany (2021)
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2021-06-27
    Description: Understanding the hydrologic connectivity between kettle holes and shallow groundwater, particularly in reaction to the highly variable local meteorological conditions, is of paramount importance for tracing water in a hydro(geo)logically complex landscape and thus for integrated water resource management. This article is aimed at identifying the dominant hydrological processes affecting the kettle holes' water balance and their interactions with the shallow groundwater domain in the Uckermark region, located in the north‐east of Germany. For this reason, based on the stable isotopes of oxygen (δ18O) and hydrogen (δ2H), an isotopic mass balance model was employed to compute the evaporative loss of water from the kettle holes from February to August 2017. Results demonstrated that shallow groundwater inflow may play the pivotal role in the processes taking part in the hydrology of the kettle holes in the Uckermark region. Based on the calculated evaporation/inflow (E/I) ratios, most of the kettle holes (86.7%) were ascertained to have a partially open, flow‐through‐dominated system. Moreover, we identified an inverse correlation between E/I ratios and the altitudes of the kettle holes. The same holds for electrical conductivity (EC) and the altitudes of the kettle holes. In accordance with the findings obtained from this study, a conceptual model explaining the interaction between the shallow groundwater and the kettle holes of Uckermark was developed. The model exhibited that across the highest altitudes, the recharge kettle holes are dominant, where a lower ratio of E/I and a lower EC was detected. By contrast, the lowest topographical depressions represent the discharge kettle holes, where a higher ratio of E/I and EC could be identified. The kettle holes existing in between were categorized as flow‐through kettle holes through which the recharge takes place from one side and discharge from the other side.
    Description: The prevailing hydrological processes influencing the kettle holes in the Uckermark region in the north‐east of Germany were investigated using the stable isotopes of oxygen and hydrogen. The possible contribution of the groundwater inflow into the kettle holes was characterized via evaporation/inflow (E/I) ratios. A conceptual model portraying hydrologic connectivity between different types of kettle holes and in relation their adjacent shallow groundwater domain was provided. image
    Keywords: 551.48 ; evaporation ; groundwater inflow ; kettle hole ; stable water isotope ; surface–groundwater interactions ; Uckermark region ; kettle holes ; hydrological processes
    Type: article
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    CITATION GEO-LEO
  • 2
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    Wildfire history of the boreal forest of south-western Yakutia (Siberia) over the last two millennia documented by a lake-sediment charcoal record (2021)
    In:  EPIC3Biogeosciences, 18(13), pp. 4185-4209, ISSN: 1726-4189
    Details
    Publication Date: 2023-06-21
    Description: Wildfires, as a key disturbance in forest ecosystems, are shaping the world's boreal landscapes. Changes in fire regimes are closely linked to a wide array of environmental factors, such as vegetation composition, climate change, and human activity. Arctic and boreal regions and, in particular, Siberian boreal forests are experiencing rising air and ground temperatures with the subsequent degradation of permafrost soils leading to shifts in tree cover and species composition. Compared to the boreal zones of North America or Europe, little is known about how such environmental changes might influence long-term fire regimes in Russia. The larch-dominated eastern Siberian deciduous boreal forests differ markedly from the composition of other boreal forests, yet data about past fire regimes remain sparse. Here, we present a high-resolution macroscopic charcoal record from lacustrine sediments of Lake Khamra (south-west Yakutia, Siberia) spanning the last ca. 2200 years, including information about charcoal particle sizes and morphotypes. Our results reveal a phase of increased charcoal accumulation between 600 and 900 CE, indicative of relatively high amounts of burnt biomass and high fire frequencies. This is followed by an almost 900-year-long period of low charcoal accumulation without significant peaks likely corresponding to cooler climate conditions. After 1750 CE fire frequencies and the relative amount of biomass burnt start to increase again, coinciding with a warming climate and increased anthropogenic land development after Russian colonization. In the 20th century, total charcoal accumulation decreases again to very low levels despite higher fire frequency, potentially reflecting a change in fire management strategies and/or a shift of the fire regime towards more frequent but smaller fires. A similar pattern for different charcoal morphotypes and comparison to a pollen and non-pollen palynomorph (NPP) record from the same sediment core indicate that broad-scale changes in vegetation composition were probably not a major driver of recorded fire regime changes. Instead, the fire regime of the last two millennia at Lake Khamra seems to be controlled mainly by a combination of short-term climate variability and anthropogenic fire ignition and suppression.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
    Format: application/pdf
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    PAPER (OA)
  • 3
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    Age determination of sediment core 16-KP-03-L10 from Lake Nutenvut (Chukotka, Russia) (2022)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Description: This data set is part of a larger data harmonization effort to make lake sediment core data machine readable and comparable. Here we standardized radiocarbon age data of sediment core 16-KP-03-L10_Long_1, retrieved in 2016 from Lake Nutenvut (Chukotka, Russia). The glacial lake Nutenvut is in an exorheic basin in the tundra-taiga transition zone. It lies at an elevation of ca. 654 m a.s.l. with a surface area of ca. 9.2 km2 and a maximum lake water depth of estimated 60 m. The 1.26 m sediment core was retrieved by a UWITEC hammer action gravity corer during the RU-Land_2016_Keperveem expedition of the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI, Germany, Potsdam) in cooperation with the North Eastern Federal State University (NEFU, Russia, Yakutsk). Radiocarbon data have been analysed in Poznan and at AWI Bremerhaven (MICADAS).
    Keywords: 16-KP-03-L10_Long_1; Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard error; AWI_Envi; AWI Arctic Land Expedition; Carbon; Category; DEPTH, sediment/rock; Hammer-modified gravity core, UWITEC; HGCUWI; Keperveem_2016; Laboratory; Laboratory code/label; Measurement identification; Polar Terrestrial Environmental Systems @ AWI; Pretreatment; Reservoir age; Reservoir age, standard error; RU-Land_2016_Keperveem; Thickness; Tschukotka, Sibiria, Russia
    Type: Dataset
    Format: text/tab-separated-values, 202 data points
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    DATA PANGAEA
  • 4
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    Organic geochemistry of sediment core EN18218 from Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AWI_Envi; AWI Arctic Land Expedition; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; Chukotka 2018; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Element analyser, ELTRA; Element analyzer, vario Cube SoliTOC; EN18218; PC; Piston corer; Polar Terrestrial Environmental Systems @ AWI; RU-Land_2018_Chukotka; Sample ID; SibLake; Sulfur, total
    Type: Dataset
    Format: text/tab-separated-values, 453 data points
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    DATA PANGAEA
  • 5
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    Age determination of sediment core EN18218 from Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age, 14C AMS, Mini Carbon Dating System (MICADAS); Age, dated; Age, dated standard error; AWI_Envi; AWI Arctic Land Expedition; Carbon; Chukotka 2018; DATE/TIME; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EN18218; Laboratory code/label; PC; Piston corer; Polar Terrestrial Environmental Systems @ AWI; RU-Land_2018_Chukotka; Sample code/label; SibLake; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 208 data points
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    DATA PANGAEA
  • 6
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    Water content and bulk density of sediment core EN18218 from Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AWI_Envi; AWI Arctic Land Expedition; Chukotka 2018; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EN18218; PC; Piston corer; Polar Terrestrial Environmental Systems @ AWI; RU-Land_2018_Chukotka; Sample ID; SibLake; Volumetric; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 323 data points
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    DATA PANGAEA
  • 7
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    Element geochemistry of sediment core EN18218 from Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Aluminium, area, total counts; AWI_Envi; AWI Arctic Land Expedition; Bromine, area, total counts; Calcium, area, total counts; Chukotka 2018; DEPTH, sediment/rock; EN18218; Iron, area, total counts; Manganese, area, total counts; PC; Piston corer; Polar Terrestrial Environmental Systems @ AWI; Potassium, area, total counts; Rubidium, area, total counts; RU-Land_2018_Chukotka; SibLake; Silicon, area, total counts; Strontium, area, total counts; Titanium, area, total counts; X-ray fluorescence (XRF); Zirconium, area, total counts
    Type: Dataset
    Format: text/tab-separated-values, 14355 data points
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    DATA PANGAEA
  • 8
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    Magnetic suscpetibility of sediment core EN18218 from Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AWI_Envi; AWI Arctic Land Expedition; Bartington MS2E point sensor; Chukotka 2018; DEPTH, sediment/rock; EN18218; PC; Piston corer; Polar Terrestrial Environmental Systems @ AWI; RU-Land_2018_Chukotka; SibLake; Susceptibility
    Type: Dataset
    Format: text/tab-separated-values, 6163 data points
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    DATA PANGAEA
  • 9
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    Sedimentological and biogeochemical dataset for Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-07-21
    Description: Datasets that provide high-resolution palaeoenvironmental information during the last glacial maximum in Chukotka, Arctic Siberia are limited. This data compilation comprises multiproxy data extracted from sediment core EN18218 obtained from Arctic glacial lake Rauchuagytgyn (67.7922°N, 168.7312°E) by piston coring during the Chukotka 2018 expedition. The dataset covers the late Pleistocene and Holocene (ca. 29 cal. ka BP). Observations within this dataset include 14C radiocarbon dates, hydrochemistry observations, sedimentological observations (water content, bulk density, grain-size, sediment color, biogeochemistry (Total sulphur (TS), Total carbon (TC), Total organic carbon (TOC), Total inorganic carbon (TIC)), X-ray fluorescence (XRF) based sediment-geochemistry and magnetic susceptibility measurements. Radiocarbon dating was performed with accelerator mass spectrometry (AMS) using the Mini Carbon Dating System (MICADAS) at AWI Bremerhaven, Germany. Water content and bulk density were measured according to the volumetric methods of Avnimelech et al, (2001). Sediment grain-size was measured using a Malvern Mastersizer 3000 laser diffraction particle analyser. Biogeochemical parameters were obtained using a Vario SoliTOC cube elemental analyser "Elementar Corp., Germany) and Eltra Carbon and Sulfur determinator (Eltra GmbH, Germany). XRF and color scanning was performed using an Avaatech core-scanner and line-scanner attachment. Magnetic susceptibility measurements were performed with a Bartington MS2E spot reading sensor. A full description of methodological procedures used within this study is provided in the publication (Vyse et al., in review).
    Keywords: AWI_Envi; Polar Terrestrial Environmental Systems @ AWI; SibLake
    Type: Dataset
    Format: application/zip, 8 datasets
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    DATA PANGAEA
  • 10
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    Hydrochemistry of Arctic glacial lake Rauchuagytgyn, Chukotka, Russia (2021)
    PANGAEA
    Details
    Publication Date: 2023-07-21
    Keywords: Aluminium; AWI_Envi; AWI Arctic Land Expedition; Barium; Bromide; Calcium; Carbon, organic, dissolved; Chloride; Chukotka 2018; Conductivity; Depth of Secchi Disk; Fluoride; ICP-OES, Inductively coupled plasma - optical emission spectrometry; Ion chromatograph, Dionex Corporation, DX-300; Iron; LAKE; Lake_Rauchuagytgyn; Magnesium; Manganese; Nitrate; pH; Phosphate; Phosphorus; Polar Terrestrial Environmental Systems @ AWI; Potassium; RU-Land_2018_Chukotka; Sampling lake; SD; Secchi disk; SibLake; Silicon; Sodium; Strontium; Sulfate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 22 data points
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    DATA PANGAEA
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