Subsea permafrost organic carbon stocks are large and of dominantly low reactivity.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
09 Jun 2023
09 Jun 2023
Historique:
received:
14
12
2022
accepted:
04
06
2023
medline:
12
6
2023
pubmed:
10
6
2023
entrez:
9
6
2023
Statut:
epublish
Résumé
Subsea permafrost carbon pools below the Arctic shelf seas are a major unknown in the global carbon cycle. We combine a numerical model of sedimentation and permafrost evolution with simplified carbon turnover to estimate accumulation and microbial decomposition of organic matter on the pan-Arctic shelf over the past four glacial cycles. We find that Arctic shelf permafrost is a globally important long-term carbon sink storing 2822 (1518-4982) Pg OC, double the amount stored in lowland permafrost. Although currently thawing, prior microbial decomposition and organic matter aging limit decomposition rates to less than 48 Tg OC/yr (25-85) constraining emissions due to thaw and suggesting that the large permafrost shelf carbon pool is largely insensitive to thaw. We identify an urgent need to reduce uncertainty in rates of microbial decomposition of organic matter in cold and saline subaquatic environments. Large emissions of methane more likely derive from older and deeper sources than from organic matter in thawing permafrost.
Identifiants
pubmed: 37296305
doi: 10.1038/s41598-023-36471-z
pii: 10.1038/s41598-023-36471-z
pmc: PMC10256719
doi:
Substances chimiques
Soil
0
Carbon
7440-44-0
Methane
OP0UW79H66
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
9425Subventions
Organisme : Horizon 2020 Framework Programme
ID : 77342
Organisme : Bundesministerium für Bildung und Forschung
ID : 01LN1709A
Informations de copyright
© 2023. The Author(s).
Références
Proc Natl Acad Sci U S A. 2022 Mar 22;119(12):e2119105119
pubmed: 35286188
Philos Trans A Math Phys Eng Sci. 2020 Oct 2;378(2181):20190359
pubmed: 32862804
Nat Commun. 2022 Oct 4;13(1):5858
pubmed: 36195594
Global Biogeochem Cycles. 2019 Jan;33(1):2-14
pubmed: 31007381
Sci Adv. 2020 Oct 16;6(42):
pubmed: 33067229
Sci Adv. 2018 Jan 17;4(1):eaao4842
pubmed: 29349299
Nat Commun. 2016 Nov 29;7:13653
pubmed: 27897191
Environ Sci Technol. 2017 Oct 17;51(20):11571-11579
pubmed: 28914530
Sci Adv. 2021 Feb 24;7(9):
pubmed: 33627437
Nature. 2012 Sep 6;489(7414):137-40
pubmed: 22932271
Nat Commun. 2019 Jan 16;10(1):264
pubmed: 30651568
Nat Commun. 2018 Sep 10;9(1):3666
pubmed: 30201999
Geophys Res Lett. 2013 Dec 16;40(23):6165-6170
pubmed: 26074633
Proc Natl Acad Sci U S A. 2021 Mar 9;118(10):
pubmed: 33649226
Nature. 2015 Apr 9;520(7546):171-9
pubmed: 25855454
Trends Microbiol. 2020 Sep;28(9):769-779
pubmed: 32362540
Proc Natl Acad Sci U S A. 2020 Aug 25;117(34):20438-20446
pubmed: 32778585
Science. 2006 Jun 16;312(5780):1612-3
pubmed: 16778046
Nat Commun. 2014 Sep 25;5:5076
pubmed: 25254503
Nat Commun. 2022 Aug 27;13(1):5057
pubmed: 36030269
Global Biogeochem Cycles. 2021 Jan;35(1):e2020GB006719
pubmed: 33519064
Glob Chang Biol. 2014 Feb;20(2):641-52
pubmed: 24399755
Science. 2010 Mar 5;327(5970):1246-50
pubmed: 20203047
Nature. 2011 Oct 05;478(7367):49-56
pubmed: 21979045
Sci Total Environ. 2021 Jul 10;777:146100
pubmed: 33684745