Methane Production Pathway Regulated Proximally by Substrate Availability and Distally by Temperature in a High-Latitude Mire Complex

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Fältnamn	Indikatorer	Metadata
000		03146naa a2200373 4500
001		oai:DiVA.org:su-175759
003		SwePub
008		191125s2019 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1757592 URI
024	7	a https://doi.org/10.1029/2019JG0053552 DOI
040		a (SwePub)su
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Chang, Kuang-Yu4 aut
245	1 0	a Methane Production Pathway Regulated Proximally by Substrate Availability and Distally by Temperature in a High-Latitude Mire Complex
264	1	c 2019
338		a print2 rdacarrier
520		a Projected 21st century changes in high-latitude climate are expected to have significant impacts on permafrost thaw, which could cause substantial increases in emissions to the atmosphere of carbon dioxide (CO2) and methane (CH4, which has a global warming potential 28 times larger than CO2 over a 100-year horizon). However, predicted CH4 emission rates are very uncertain due to difficulties in modeling complex interactions among hydrological, thermal, biogeochemical, and plant processes. Methanogenic production pathways (i.e., acetoclastic [AM] and hydrogenotrophic [HM]) and the magnitude of CH4 emissions may both change as permafrost thaws, but a mechanistic analysis of controls on such shifts in CH4 dynamics is lacking. In this study, we reproduced observed shifts in CH4 emissions and production pathways with a comprehensive biogeochemical model (ecosys) at the Stordalen Mire in subarctic Sweden. Our results demonstrate that soil temperature changes differently affect AM and HM substrate availability, which regulates magnitudes of AM, HM, and thereby net CH4 emissions. We predict very large landscape-scale, vertical, and temporal variations in the modeled HM fraction, highlighting that measurement strategies for metrics that compare CH4 production pathways could benefit from model informed scale of temporal and spatial variance. Finally, our findings suggest that the warming and wetting trends projected in northern peatlands could enhance peatland AM fraction and CH4 emissions even without further permafrost degradation.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng
653		a methane cycling
653		a permafrost carbon
653		a climate carbon feedbacks
700	1	a Riley, William J.4 aut
700	1	a Brodie, Eoin L.4 aut
700	1	a McCalley, Carmody K.4 aut
700	1	a Crill, Patrick M.u Stockholms universitet,Institutionen för geologiska vetenskaper4 aut0 (Swepub:su)pcril
700	1	a Grant, Robert F.4 aut
710	2	a Stockholms universitetb Institutionen för geologiska vetenskaper4 org
773	0	t Journal of Geophysical Research - Biogeosciencesg 124:10, s. 3057-3074q 124:10<3057-3074x 2169-8953x 2169-8961
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-175759
856	4 8	u https://doi.org/10.1029/2019JG005355

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Av författaren/redakt...: Chang, Kuang-Yu; Riley, William J ...; Brodie, Eoin L.; McCalley, Carmod ...; Crill, Patrick M ...; Grant, Robert F.

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Av lärosätet: Stockholms universitet

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