Permafrost carbon-climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics

Proceedings of the National Academy of Sciences of the United States of America
C D KovenWilliam J Riley

Abstract

Permafrost soils contain enormous amounts of organic carbon whose stability is contingent on remaining frozen. With future warming, these soils may release carbon to the atmosphere and act as a positive feedback to climate change. Significant uncertainty remains on the postthaw carbon dynamics of permafrost-affected ecosystems, in particular since most of the carbon resides at depth where decomposition dynamics may differ from surface soils, and since nitrogen mineralized by decomposition may enhance plant growth. Here we show, using a carbon-nitrogen model that includes permafrost processes forced in an unmitigated warming scenario, that the future carbon balance of the permafrost region is highly sensitive to the decomposability of deeper carbon, with the net balance ranging from 21 Pg C to 164 Pg C losses by 2300. Increased soil nitrogen mineralization reduces nutrient limitations, but the impact of deep nitrogen on the carbon budget is small due to enhanced nitrogen availability from warming surface soils and seasonal asynchrony between deeper nitrogen availability and plant nitrogen demands. Although nitrogen dynamics are highly uncertain, the future carbon balance of this region is projected to hinge more on the rate and ...Continue Reading

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Citations

Oct 7, 2015·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·C D KovenM Turetsky
Jun 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·Nicholas C ParazooCharles E Miller
Jan 25, 2018·Global Change Biology·Bertrand GuenetIvan A Janssens
Nov 2, 2019·Global Change Biology·Shilong PiaoStephen Sitch
May 2, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Swenja SurminskiDavid Proverbs
Jul 11, 2019·Nature Communications·David W KicklighterQianlai Zhuang
Aug 25, 2015·Global Change Biology·Benjamin W Abbott, Jeremy B Jones
Oct 26, 2016·Global Change Biology·Blanca BernalThomas J Mozdzer
Oct 12, 2016·Nature Communications·D OlefeldtM R Turetsky
Feb 17, 2017·Global Change Biology·Marguerite MauritzEdward A G Schuur
Jul 6, 2020·Nature Communications·Dan KouYuanhe Yang
Mar 6, 2019·Scientific Reports·Zhendong WuAnders Ahlström
Mar 19, 2020·Scientific Reports·Christian BeerSergey Zimov
May 6, 2020·Nature Communications·Jan NitzbonJulia Boike
Jun 5, 2020·Science Advances·Taihua WangBojie Fu
Nov 10, 2017·Global Change Biology·William R WiederGordon B Bonan
May 29, 2018·Global Change Biology·Junyi LiangYiqi Luo
Jul 18, 2018·Nature Microbiology·Joanne B EmersonMatthew B Sullivan
Oct 16, 2018·Nature Climate Change·T F Keenan, W J Riley
Aug 17, 2018·Nature Communications·Katey Walter AnthonyGuido Grosse
Aug 11, 2021·Proceedings of the National Academy of Sciences of the United States of America·Da WeiXiaodan Wang
Mar 24, 2018·Environmental Science & Technology·Hongmei ChenBaohua Gu
Jul 10, 2018·Environmental Science & Technology·Guibiao YangYuanhe Yang

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