Submarine Permafrost as a Long-term Late Quaternary Carbon Sink
Organic carbon (OC) stored in Arctic continental shelf sediment is a climate-sensitive but poorly quantified component of the global carbon cycle. The current interglacial period means that most shelf permafrost, along with its OC, is currently warmer than -2 °C, and therefore susceptible to small a...
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ftawi:oai:epic.awi.de:56506 2024-09-09T19:20:54+00:00 Submarine Permafrost as a Long-term Late Quaternary Carbon Sink Miesner, Frederieke Overduin, Pier Paul Grosse, Guido Strauss, Jens Langer, Moritz Westermann, Sebastian Schneider von Deimling, Thomas Brovkin, Victor Arndt, Sandra 2021-10-25 application/pdf https://epic.awi.de/id/eprint/56506/ https://epic.awi.de/id/eprint/56506/1/FMiesner_Poster_RCOP2021_SubmarinePermafrostCarbon.pdf https://hdl.handle.net/10013/epic.04511bcd-bcad-4387-927f-1456ac24b526 unknown https://epic.awi.de/id/eprint/56506/1/FMiesner_Poster_RCOP2021_SubmarinePermafrostCarbon.pdf Miesner, F. orcid:0000-0002-2849-0406 , Overduin, P. P. orcid:0000-0001-9849-4712 , Grosse, G. orcid:0000-0001-5895-2141 , Strauss, J. orcid:0000-0003-4678-4982 , Langer, M. orcid:0000-0002-2704-3655 , Westermann, S. orcid:0000-0003-0514-4321 , Schneider von Deimling, T. orcid:0000-0002-4140-0495 , Brovkin, V. orcid:0000-0001-6420-3198 and Arndt, S. orcid:0000-0002-0235-8124 (2021) Submarine Permafrost as a Long-term Late Quaternary Carbon Sink , 2021 Regional Conference on Permafrost, online, 25 October 2021 - 29 October 2021 . hdl:10013/epic.04511bcd-bcad-4387-927f-1456ac24b526 EPIC32021 Regional Conference on Permafrost, online, 2021-10-25-2021-10-29 Conference NonPeerReviewed 2021 ftawi 2024-06-24T04:28:46Z Organic carbon (OC) stored in Arctic continental shelf sediment is a climate-sensitive but poorly quantified component of the global carbon cycle. The current interglacial period means that most shelf permafrost, along with its OC, is currently warmer than -2 °C, and therefore susceptible to small additional warming in the near future. Estimating how much OC is potentially stored in subsea permafrost is thus key to a quantitative understanding of potential impacts of permafrost thaw on carbon mobilization in a warming Arctic. We developed a process-based model of permafrost distribution and organic matter (OM) sedimentation and decomposition to estimate the contribution of submarine permafrost to Arctic shelf organic carbon stocks. Driven by Earth System Model forcing, our model calculates 1D heat flow below the earth surface, ice caps and sea bed, and uses a reactivity continuum model of OM decomposition. We restrict our modeling to sediment that was buried within the last four glacial cycles (450 kyr), and therefore neglect OC stocks deeper than about 100 m, including any gas hydrates. Restricting OM decomposition to the liquid habitat for microbial activity in the sediment, we estimated that permafrost below the Arctic Shelf stores at least as much OC as the terrestrial counterpart at pre-industrial time, and probably in the range of twice to three times as much OC. We compared the effect of varying the OC sedimentation rates and OC reactivity. Higher reactivity in marine sediments combined with lower ice contents to increase the rate of OM decomposition, relative to sediment deposited in terrestrial settings. As a result, permafrost in our model preserved a greater proportion of marine OM from decomposition while having little effect (< 5%) on the amount of recalcitrant terrestrial OC. These differences in sedimentation rate and reactivity influence the distribution of OC preservation on the Arctic shelf. Our modeling shows that subsea permafrost is a relevant OC stock and that more research is needed to ... Conference Object Arctic Ice permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Organic carbon (OC) stored in Arctic continental shelf sediment is a climate-sensitive but poorly quantified component of the global carbon cycle. The current interglacial period means that most shelf permafrost, along with its OC, is currently warmer than -2 °C, and therefore susceptible to small additional warming in the near future. Estimating how much OC is potentially stored in subsea permafrost is thus key to a quantitative understanding of potential impacts of permafrost thaw on carbon mobilization in a warming Arctic. We developed a process-based model of permafrost distribution and organic matter (OM) sedimentation and decomposition to estimate the contribution of submarine permafrost to Arctic shelf organic carbon stocks. Driven by Earth System Model forcing, our model calculates 1D heat flow below the earth surface, ice caps and sea bed, and uses a reactivity continuum model of OM decomposition. We restrict our modeling to sediment that was buried within the last four glacial cycles (450 kyr), and therefore neglect OC stocks deeper than about 100 m, including any gas hydrates. Restricting OM decomposition to the liquid habitat for microbial activity in the sediment, we estimated that permafrost below the Arctic Shelf stores at least as much OC as the terrestrial counterpart at pre-industrial time, and probably in the range of twice to three times as much OC. We compared the effect of varying the OC sedimentation rates and OC reactivity. Higher reactivity in marine sediments combined with lower ice contents to increase the rate of OM decomposition, relative to sediment deposited in terrestrial settings. As a result, permafrost in our model preserved a greater proportion of marine OM from decomposition while having little effect (< 5%) on the amount of recalcitrant terrestrial OC. These differences in sedimentation rate and reactivity influence the distribution of OC preservation on the Arctic shelf. Our modeling shows that subsea permafrost is a relevant OC stock and that more research is needed to ... |
format |
Conference Object |
author |
Miesner, Frederieke Overduin, Pier Paul Grosse, Guido Strauss, Jens Langer, Moritz Westermann, Sebastian Schneider von Deimling, Thomas Brovkin, Victor Arndt, Sandra |
spellingShingle |
Miesner, Frederieke Overduin, Pier Paul Grosse, Guido Strauss, Jens Langer, Moritz Westermann, Sebastian Schneider von Deimling, Thomas Brovkin, Victor Arndt, Sandra Submarine Permafrost as a Long-term Late Quaternary Carbon Sink |
author_facet |
Miesner, Frederieke Overduin, Pier Paul Grosse, Guido Strauss, Jens Langer, Moritz Westermann, Sebastian Schneider von Deimling, Thomas Brovkin, Victor Arndt, Sandra |
author_sort |
Miesner, Frederieke |
title |
Submarine Permafrost as a Long-term Late Quaternary Carbon Sink |
title_short |
Submarine Permafrost as a Long-term Late Quaternary Carbon Sink |
title_full |
Submarine Permafrost as a Long-term Late Quaternary Carbon Sink |
title_fullStr |
Submarine Permafrost as a Long-term Late Quaternary Carbon Sink |
title_full_unstemmed |
Submarine Permafrost as a Long-term Late Quaternary Carbon Sink |
title_sort |
submarine permafrost as a long-term late quaternary carbon sink |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/56506/ https://epic.awi.de/id/eprint/56506/1/FMiesner_Poster_RCOP2021_SubmarinePermafrostCarbon.pdf https://hdl.handle.net/10013/epic.04511bcd-bcad-4387-927f-1456ac24b526 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost |
genre_facet |
Arctic Ice permafrost |
op_source |
EPIC32021 Regional Conference on Permafrost, online, 2021-10-25-2021-10-29 |
op_relation |
https://epic.awi.de/id/eprint/56506/1/FMiesner_Poster_RCOP2021_SubmarinePermafrostCarbon.pdf Miesner, F. orcid:0000-0002-2849-0406 , Overduin, P. P. orcid:0000-0001-9849-4712 , Grosse, G. orcid:0000-0001-5895-2141 , Strauss, J. orcid:0000-0003-4678-4982 , Langer, M. orcid:0000-0002-2704-3655 , Westermann, S. orcid:0000-0003-0514-4321 , Schneider von Deimling, T. orcid:0000-0002-4140-0495 , Brovkin, V. orcid:0000-0001-6420-3198 and Arndt, S. orcid:0000-0002-0235-8124 (2021) Submarine Permafrost as a Long-term Late Quaternary Carbon Sink , 2021 Regional Conference on Permafrost, online, 25 October 2021 - 29 October 2021 . hdl:10013/epic.04511bcd-bcad-4387-927f-1456ac24b526 |
_version_ |
1809761082951073792 |