Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf
The mobilization of carbon in degrading permafrost is a long-term process and an important feedback upon climate change. Under submarine conditions substantial permafrost warming occurs millennia before permafrost thaws, potentially stimulating microbial communities. How microbial community composit...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.895292 2023-05-15T15:16:51+02:00 Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf Mitzscherling, Julia Horn, Fabian Winterfeld, Maria Mahler, Linda Kallmeyer, Jens Overduin, Pier Paul Winkel, Matthias Grigoriev, Mikhail N Wagner, Dirk Liebner, Susanne MEDIAN LATITUDE: 73.640159 * MEDIAN LONGITUDE: 117.169868 * SOUTH-BOUND LATITUDE: 73.605970 * WEST-BOUND LONGITUDE: 117.166972 * NORTH-BOUND LATITUDE: 73.710028 * EAST-BOUND LONGITUDE: 117.177360 * DATE/TIME START: 2005-04-12T00:00:00 * DATE/TIME END: 2005-04-23T00:00:00 2018-10-15 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.895292 https://doi.org/10.1594/PANGAEA.895292 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.895292 https://doi.org/10.1594/PANGAEA.895292 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Mitzscherling, Julia; Horn, Fabian; Winterfeld, Maria; Mahler, Linda; Kallmeyer, Jens; Overduin, Pier Paul; Schirrmeister, Lutz; Winkel, Matthias; Grigoriev, Mikhail N; Wagner, Dirk; Liebner, Susanne (2019): Microbial community composition and abundance after millennia of submarine permafrost warming. Biogeosciences, 16(19), 3941-3958, https://doi.org/10.5194/bg-16-3941-2019 AWI_PerDyn Permafrost Research (Periglacial Dynamics) @ AWI Dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.895292 https://doi.org/10.5194/bg-16-3941-2019 2023-01-20T07:34:13Z The mobilization of carbon in degrading permafrost is a long-term process and an important feedback upon climate change. Under submarine conditions substantial permafrost warming occurs millennia before permafrost thaws, potentially stimulating microbial communities. How microbial community composition and abundance responded to millennial-scale permafrost warming remains, however, unkown. We measured the in situ development of bacterial community composition and abundance together with temperature, salinity and pore water chemistry along an onshore-offshore transect on the Siberian Arctic Shelf. Samples derived from ice-bonded terrestrial permafrost comparable in age and sedimentation history that had been warming by more than 10 °C over the last 2500 years. Bacterial assemblages identified through amplicon sequencing correlated only weakly with temperature but strongly with pore water stable isotope signatures. They showed a significant spatial variation. Bacterial 16S rRNA gene copies quantified through qPCR negatively correlated with rising temperature, while both gene copies and total cell counts negatively correlated with increasing pore water salinity. Correlations of microbial community composition and abundance to stable isotope signatures and pore water salinity imply that they still mainly reflect the sedimentation history. On time-scales of centuries, permafrost warming coincided with decreasing microbial abundances, whereas millennia after inundation, microbial cell abundance was similar to onshore permafrost. We suggest that, as long as permafrost remains frozen the effect of warming alone on the permafrost-carbon-feedback is marginally even on time-scales of millennia because it has an overall low-level effect on microbial community composition and abundance. Dataset Arctic Climate change Ice laptev Laptev Sea permafrost PANGAEA - Data Publisher for Earth & Environmental Science Arctic Laptev Sea ENVELOPE(117.166972,117.177360,73.710028,73.605970) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_PerDyn Permafrost Research (Periglacial Dynamics) @ AWI |
spellingShingle |
AWI_PerDyn Permafrost Research (Periglacial Dynamics) @ AWI Mitzscherling, Julia Horn, Fabian Winterfeld, Maria Mahler, Linda Kallmeyer, Jens Overduin, Pier Paul Winkel, Matthias Grigoriev, Mikhail N Wagner, Dirk Liebner, Susanne Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf |
topic_facet |
AWI_PerDyn Permafrost Research (Periglacial Dynamics) @ AWI |
description |
The mobilization of carbon in degrading permafrost is a long-term process and an important feedback upon climate change. Under submarine conditions substantial permafrost warming occurs millennia before permafrost thaws, potentially stimulating microbial communities. How microbial community composition and abundance responded to millennial-scale permafrost warming remains, however, unkown. We measured the in situ development of bacterial community composition and abundance together with temperature, salinity and pore water chemistry along an onshore-offshore transect on the Siberian Arctic Shelf. Samples derived from ice-bonded terrestrial permafrost comparable in age and sedimentation history that had been warming by more than 10 °C over the last 2500 years. Bacterial assemblages identified through amplicon sequencing correlated only weakly with temperature but strongly with pore water stable isotope signatures. They showed a significant spatial variation. Bacterial 16S rRNA gene copies quantified through qPCR negatively correlated with rising temperature, while both gene copies and total cell counts negatively correlated with increasing pore water salinity. Correlations of microbial community composition and abundance to stable isotope signatures and pore water salinity imply that they still mainly reflect the sedimentation history. On time-scales of centuries, permafrost warming coincided with decreasing microbial abundances, whereas millennia after inundation, microbial cell abundance was similar to onshore permafrost. We suggest that, as long as permafrost remains frozen the effect of warming alone on the permafrost-carbon-feedback is marginally even on time-scales of millennia because it has an overall low-level effect on microbial community composition and abundance. |
format |
Dataset |
author |
Mitzscherling, Julia Horn, Fabian Winterfeld, Maria Mahler, Linda Kallmeyer, Jens Overduin, Pier Paul Winkel, Matthias Grigoriev, Mikhail N Wagner, Dirk Liebner, Susanne |
author_facet |
Mitzscherling, Julia Horn, Fabian Winterfeld, Maria Mahler, Linda Kallmeyer, Jens Overduin, Pier Paul Winkel, Matthias Grigoriev, Mikhail N Wagner, Dirk Liebner, Susanne |
author_sort |
Mitzscherling, Julia |
title |
Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf |
title_short |
Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf |
title_full |
Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf |
title_fullStr |
Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf |
title_full_unstemmed |
Pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at Mamontov Klyk Cape, Laptev Sea shelf |
title_sort |
pore water chemistry, grain sizes and sediment temperature of 4 sediment cores from submarine permafrost at mamontov klyk cape, laptev sea shelf |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.895292 https://doi.org/10.1594/PANGAEA.895292 |
op_coverage |
MEDIAN LATITUDE: 73.640159 * MEDIAN LONGITUDE: 117.169868 * SOUTH-BOUND LATITUDE: 73.605970 * WEST-BOUND LONGITUDE: 117.166972 * NORTH-BOUND LATITUDE: 73.710028 * EAST-BOUND LONGITUDE: 117.177360 * DATE/TIME START: 2005-04-12T00:00:00 * DATE/TIME END: 2005-04-23T00:00:00 |
long_lat |
ENVELOPE(117.166972,117.177360,73.710028,73.605970) |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Climate change Ice laptev Laptev Sea permafrost |
genre_facet |
Arctic Climate change Ice laptev Laptev Sea permafrost |
op_source |
Supplement to: Mitzscherling, Julia; Horn, Fabian; Winterfeld, Maria; Mahler, Linda; Kallmeyer, Jens; Overduin, Pier Paul; Schirrmeister, Lutz; Winkel, Matthias; Grigoriev, Mikhail N; Wagner, Dirk; Liebner, Susanne (2019): Microbial community composition and abundance after millennia of submarine permafrost warming. Biogeosciences, 16(19), 3941-3958, https://doi.org/10.5194/bg-16-3941-2019 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.895292 https://doi.org/10.1594/PANGAEA.895292 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.895292 https://doi.org/10.5194/bg-16-3941-2019 |
_version_ |
1766347137365311488 |