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
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 bud...
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ftcopernicus:oai:publications.copernicus.org:bg92996 2023-05-15T14:58:12+02:00 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, Stuart A. Herzschuh, Ulrike Pfalz, Gregor Pestryakova, Lyudmila A. Diekmann, Bernhard Nowaczyk, Norbert Biskaborn, Boris K. 2021-08-24 application/pdf https://doi.org/10.5194/bg-18-4791-2021 https://bg.copernicus.org/articles/18/4791/2021/ eng eng doi:10.5194/bg-18-4791-2021 https://bg.copernicus.org/articles/18/4791/2021/ eISSN: 1726-4189 Text 2021 ftcopernicus https://doi.org/10.5194/bg-18-4791-2021 2021-08-30T16:22:17Z 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 m 3 . 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. Text Arctic Chukotka Ice permafrost Thermokarst Siberia Copernicus Publications: E-Journals Arctic Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Biogeosciences 18 16 4791 4816 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
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 m 3 . 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. |
format |
Text |
author |
Vyse, Stuart A. Herzschuh, Ulrike Pfalz, Gregor Pestryakova, Lyudmila A. Diekmann, Bernhard Nowaczyk, Norbert Biskaborn, Boris K. |
spellingShingle |
Vyse, Stuart A. Herzschuh, Ulrike Pfalz, Gregor Pestryakova, Lyudmila A. Diekmann, Bernhard Nowaczyk, Norbert Biskaborn, Boris K. 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 |
author_facet |
Vyse, Stuart A. Herzschuh, Ulrike Pfalz, Gregor Pestryakova, Lyudmila A. Diekmann, Bernhard Nowaczyk, Norbert Biskaborn, Boris K. |
author_sort |
Vyse, Stuart A. |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-18-4791-2021 https://bg.copernicus.org/articles/18/4791/2021/ |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Arctic Glacial Lake |
geographic_facet |
Arctic Glacial Lake |
genre |
Arctic Chukotka Ice permafrost Thermokarst Siberia |
genre_facet |
Arctic Chukotka Ice permafrost Thermokarst Siberia |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-18-4791-2021 https://bg.copernicus.org/articles/18/4791/2021/ |
op_doi |
https://doi.org/10.5194/bg-18-4791-2021 |
container_title |
Biogeosciences |
container_volume |
18 |
container_issue |
16 |
container_start_page |
4791 |
op_container_end_page |
4816 |
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1766330289782521856 |