DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx
Permafrost region subsurface organic carbon (OC) pools are a major component of the terrestrial carbon cycle and vulnerable to a warming climate. Thermokarst lagoons are an important transition stage with complex depositional histories during which permafrost and lacustrine carbon pools are transfor...
Main Authors: | , , , , , , , , , , , |
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2021
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Online Access: | https://doi.org/10.3389/feart.2021.637899.s001 |
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ftsmithonian:oai:figshare.com:article/15041517 |
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institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change talik Arctic Siberia Yedoma inundation permafrost carbon OSL (optically stimulated luminescence) coastal erosion |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change talik Arctic Siberia Yedoma inundation permafrost carbon OSL (optically stimulated luminescence) coastal erosion Maren Jenrich (11174835) Michael Angelopoulos (11080512) Guido Grosse (6270902) Pier Paul Overduin (11080527) Lutz Schirrmeister (5496662) Ingmar Nitze (9266747) Boris K. Biskaborn (8714472) Susanne Liebner (11174838) Mikhail Grigoriev (11080518) Andrew Murray (802050) Loeka L. Jongejans (9144074) Jens Strauss (5496671) DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change talik Arctic Siberia Yedoma inundation permafrost carbon OSL (optically stimulated luminescence) coastal erosion |
description |
Permafrost region subsurface organic carbon (OC) pools are a major component of the terrestrial carbon cycle and vulnerable to a warming climate. Thermokarst lagoons are an important transition stage with complex depositional histories during which permafrost and lacustrine carbon pools are transformed along eroding Arctic coasts. The effects of temperature and salinity changes during thermokarst lake to lagoon transitions on thaw history and lagoon deposits are understudied. We analyzed two 30-m-long sediment cores from two thermokarst lagoons on the Bykovsky Peninsula, Northeast Siberia, using sedimentological, geochronological, hydrochemical, and biogeochemical techniques. Using remote sensing we distinguished between a semi-closed and a nearly closed lagoon. We (1) characterized the depositional history, (2) studied the impact of marine inundation on ice-bearing permafrost and taliks, and (3) quantified the OC pools for different stages of thermokarst lagoons. Fluvial and former Yedoma deposits were found at depth between 30 and 8.5 m, while lake and lagoon deposits formed the upper layers. The electrical conductivity of the pore water indicated hypersaline conditions for the semi-closed lagoon (max: 108 mS/cm), while fresh to brackish conditions were observed beneath a 5 m-thick surface saline layer at the nearly closed lagoon. The deposits had a mean OC content of 15 ± 2 kg/m 3 , with higher values in the semi-closed lagoon. Based on the cores we estimated a total OC pool of 5.7 Mt-C for the first 30 m of sediment below five mapped lagoons on the Bykovsky Peninsula. Our results suggest that paleo river branches shaped the middle Pleistocene landscape followed by late Pleistocene Yedoma permafrost accumulation and early Holocene lake development. Afterward, lake drainage, marine flooding, and bedfast ice formation caused the saline enrichment of pore water, which led to cryotic talik development. We find that the OC-pool of Arctic lagoons may comprise a substantial inventory of partially thawed and partially refrozen OC, which is available for microbial degradation processes at the Arctic terrestrial-marine interface. Climate change in the Arctic leading to sea level rise, permafrost thaw, coastal erosion, and sea ice loss may increase the rate of thermokarst lagoon formation and thus increase the importance of lagoons as biogeochemical processors of former permafrost OC. |
format |
Dataset |
author |
Maren Jenrich (11174835) Michael Angelopoulos (11080512) Guido Grosse (6270902) Pier Paul Overduin (11080527) Lutz Schirrmeister (5496662) Ingmar Nitze (9266747) Boris K. Biskaborn (8714472) Susanne Liebner (11174838) Mikhail Grigoriev (11080518) Andrew Murray (802050) Loeka L. Jongejans (9144074) Jens Strauss (5496671) |
author_facet |
Maren Jenrich (11174835) Michael Angelopoulos (11080512) Guido Grosse (6270902) Pier Paul Overduin (11080527) Lutz Schirrmeister (5496662) Ingmar Nitze (9266747) Boris K. Biskaborn (8714472) Susanne Liebner (11174838) Mikhail Grigoriev (11080518) Andrew Murray (802050) Loeka L. Jongejans (9144074) Jens Strauss (5496671) |
author_sort |
Maren Jenrich (11174835) |
title |
DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx |
title_short |
DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx |
title_full |
DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx |
title_fullStr |
DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx |
title_full_unstemmed |
DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx |
title_sort |
datasheet1_thermokarst lagoons: a core-based assessment of depositional characteristics and an estimate of carbon pools on the bykovsky peninsula.docx |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.637899.s001 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Arctic Talik |
geographic_facet |
Arctic Talik |
genre |
Arctic Climate change Ice permafrost Sea ice Thermokarst Siberia |
genre_facet |
Arctic Climate change Ice permafrost Sea ice Thermokarst Siberia |
op_relation |
https://figshare.com/articles/dataset/DataSheet1_Thermokarst_Lagoons_A_Core-Based_Assessment_of_Depositional_Characteristics_and_an_Estimate_of_Carbon_Pools_on_the_Bykovsky_Peninsula_docx/15041517 doi:10.3389/feart.2021.637899.s001 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.637899.s001 |
_version_ |
1766326247127777280 |
spelling |
ftsmithonian:oai:figshare.com:article/15041517 2023-05-15T14:54:32+02:00 DataSheet1_Thermokarst Lagoons: A Core-Based Assessment of Depositional Characteristics and an Estimate of Carbon Pools on the Bykovsky Peninsula.docx Maren Jenrich (11174835) Michael Angelopoulos (11080512) Guido Grosse (6270902) Pier Paul Overduin (11080527) Lutz Schirrmeister (5496662) Ingmar Nitze (9266747) Boris K. Biskaborn (8714472) Susanne Liebner (11174838) Mikhail Grigoriev (11080518) Andrew Murray (802050) Loeka L. Jongejans (9144074) Jens Strauss (5496671) 2021-07-23T04:29:37Z https://doi.org/10.3389/feart.2021.637899.s001 unknown https://figshare.com/articles/dataset/DataSheet1_Thermokarst_Lagoons_A_Core-Based_Assessment_of_Depositional_Characteristics_and_an_Estimate_of_Carbon_Pools_on_the_Bykovsky_Peninsula_docx/15041517 doi:10.3389/feart.2021.637899.s001 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change talik Arctic Siberia Yedoma inundation permafrost carbon OSL (optically stimulated luminescence) coastal erosion Dataset 2021 ftsmithonian https://doi.org/10.3389/feart.2021.637899.s001 2021-07-25T16:27:38Z Permafrost region subsurface organic carbon (OC) pools are a major component of the terrestrial carbon cycle and vulnerable to a warming climate. Thermokarst lagoons are an important transition stage with complex depositional histories during which permafrost and lacustrine carbon pools are transformed along eroding Arctic coasts. The effects of temperature and salinity changes during thermokarst lake to lagoon transitions on thaw history and lagoon deposits are understudied. We analyzed two 30-m-long sediment cores from two thermokarst lagoons on the Bykovsky Peninsula, Northeast Siberia, using sedimentological, geochronological, hydrochemical, and biogeochemical techniques. Using remote sensing we distinguished between a semi-closed and a nearly closed lagoon. We (1) characterized the depositional history, (2) studied the impact of marine inundation on ice-bearing permafrost and taliks, and (3) quantified the OC pools for different stages of thermokarst lagoons. Fluvial and former Yedoma deposits were found at depth between 30 and 8.5 m, while lake and lagoon deposits formed the upper layers. The electrical conductivity of the pore water indicated hypersaline conditions for the semi-closed lagoon (max: 108 mS/cm), while fresh to brackish conditions were observed beneath a 5 m-thick surface saline layer at the nearly closed lagoon. The deposits had a mean OC content of 15 ± 2 kg/m 3 , with higher values in the semi-closed lagoon. Based on the cores we estimated a total OC pool of 5.7 Mt-C for the first 30 m of sediment below five mapped lagoons on the Bykovsky Peninsula. Our results suggest that paleo river branches shaped the middle Pleistocene landscape followed by late Pleistocene Yedoma permafrost accumulation and early Holocene lake development. Afterward, lake drainage, marine flooding, and bedfast ice formation caused the saline enrichment of pore water, which led to cryotic talik development. We find that the OC-pool of Arctic lagoons may comprise a substantial inventory of partially thawed and partially refrozen OC, which is available for microbial degradation processes at the Arctic terrestrial-marine interface. Climate change in the Arctic leading to sea level rise, permafrost thaw, coastal erosion, and sea ice loss may increase the rate of thermokarst lagoon formation and thus increase the importance of lagoons as biogeochemical processors of former permafrost OC. Dataset Arctic Climate change Ice permafrost Sea ice Thermokarst Siberia Unknown Arctic Talik ENVELOPE(146.601,146.601,59.667,59.667) |