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  Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

Vyse, S. A., Herzschuh, U., Pfalz, G., Pestryakova, L. A., Diekmann, B., Nowaczyk, N., Biskaborn, B. K. (2021): Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses. - Biogeosciences, 18, 16, 4791-4816.
https://doi.org/10.5194/bg-18-4791-2021

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007642 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007642_1
Genre: Journal Article

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 Creators:
Vyse, Stuart A.1, Author
Herzschuh, Ulrike1, Author
Pfalz, Gregor1, Author
Pestryakova, Lyudmila A.1, Author
Diekmann, Bernhard1, Author
Nowaczyk, N.2, Author              
Biskaborn, Boris K.1, Author
Affiliations:
1External Organizations, ou_persistent22              
24.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146046              

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 Abstract: Lakes act as important sinks for inorganic and organic sediment components. However, investigations of sedimentary carbon budgets within glacial lakes are currently absent from Arctic Siberia. The aim of this paper is to provide the first reconstruction of accumulation rates, sediment and carbon budgets from a lacustrine sediment core from Lake Rauchuagytgyn, Chukotka (Arctic Siberia). We combined multiple sediment biogeochemical and sedimentological parameters from a radiocarbon-dated 6.5 m sediment core with lake basin hydroacoustic data to derive sediment stratigraphy, sediment volumes and infill budgets. Our results distinguished three principal sediment and carbon accumulation regimes that could be identified across all measured environmental proxies including early Marine Isotope Stage 2 (MIS2) (ca. 29–23.4 ka cal BP), mid-MIS2–early MIS1 (ca. 23.4–11.69 ka cal BP) and the Holocene (ca. 11.69–present). Estimated organic carbon accumulation rates (OCARs) were higher within Holocene sediments (average 3.53 g OC m−2 a−1) than Pleistocene sediments (average 1.08 g OC m−2 a−1) and are similar to those calculated for boreal lakes from Quebec and Finland and Lake Baikal but significantly lower than Siberian thermokarst lakes and Alberta glacial lakes. Using a bootstrapping approach, we estimated the total organic carbon pool to be 0.26 ± 0.02 Mt and a total sediment pool of 25.7 ± 1.71 Mt within a hydroacoustically derived sediment volume of ca. 32 990 557 m3. The total organic carbon pool is substantially smaller than Alaskan yedoma, thermokarst lake sediments and Alberta glacial lakes but shares similarities with Finnish boreal lakes. Temporal variability in sediment and carbon accumulation dynamics at Lake Rauchuagytgyn is controlled predominantly by palaeoclimate variation that regulates lake ice-cover dynamics and catchment glacial, fluvial and permafrost processes through time. These processes, in turn, affect catchment and within-lake primary productivity as well as catchment soil development. Spatial differences compared to other lake systems at a trans-regional scale likely relate to the high-latitude, mountainous location of Lake Rauchuagytgyn.

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Language(s): eng - English
 Dates: 2021-08-242021
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.5194/bg-18-4791-2021
GFZPOF: p4 T5 Future Landscapes
OATYPE: Gold Open Access
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Title: Biogeosciences
Source Genre: Journal, SCI, Scopus, oa
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Pages: - Volume / Issue: 18 (16) Sequence Number: - Start / End Page: 4791 - 4816 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals47
Publisher: Copernicus