Measurement of the C-13 isotopic signature of methane emissions from northern European wetlands

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Fältnamn	Indikatorer	Metadata
000		04020naa a2200625 4500
001		oai:DiVA.org:su-143469
003		SwePub
008		170602s2017 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1434692 URI
024	7	a https://doi.org/10.1002/2016GB0055042 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 Fisher, Rebecca E.4 aut
245	1 0	a Measurement of the C-13 isotopic signature of methane emissions from northern European wetlands
264	1	c 2017
338		a print2 rdacarrier
520		a Isotopic data provide powerful constraints on regional and global methane emissions and their source profiles. However, inverse modeling of spatially resolved methane flux is currently constrained by a lack of information on the variability of source isotopic signatures. In this study, isotopic signatures of emissions in the Fennoscandian Arctic have been determined in chambers over wetland, in the air 0.3 to 3m above the wetland surface and by aircraft sampling from 100m above wetlands up to the stratosphere. Overall, the methane flux to atmosphere has a coherent delta C-13 isotopic signature of -71 +/- 1%, measured in situ on the ground in wetlands. This is in close agreement with delta C-13 isotopic signatures of local and regional methane increments measured by aircraft campaigns flying through air masses containing elevated methane mole fractions. In contrast, results from wetlands in Canadian boreal forest farther south gave isotopic signatures of -67 +/- 1%. Wetland emissions dominate the local methane source measured over the European Arctic in summer. Chamber measurements demonstrate a highly variable methane flux and isotopic signature, but the results from air sampling within wetland areas show that emissions mix rapidly immediately above the wetland surface and methane emissions reaching the wider atmosphere do indeed have strongly coherent C isotope signatures. The study suggests that for boreal wetlands (>60 degrees N) global and regional modeling can use an isotopic signature of -71 parts per thousand to apportion sources more accurately, but there is much need for further measurements over other wetlands regions to verify this.
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
700	1	a France, James L.4 aut
700	1	a Lowry, David4 aut
700	1	a Lanoisellé, Mathias4 aut
700	1	a Brownlow, Rebecca4 aut
700	1	a Pyle, John A.4 aut
700	1	a Cain, Michelle4 aut
700	1	a Warwick, Nicola4 aut
700	1	a Skiba, Ute M.4 aut
700	1	a Drewer, Julia4 aut
700	1	a Dinsmore, Kerry J.4 aut
700	1	a Leeson, Sarah R.4 aut
700	1	a Bauguitte, Stéphane J. -B.4 aut
700	1	a Wellpott, Axel4 aut
700	1	a O'Shea, Sebastian J.4 aut
700	1	a Allen, Grant4 aut
700	1	a Gallagher, Martin W.4 aut
700	1	a Pitt, Joseph4 aut
700	1	a Percival, Carl J.4 aut
700	1	a Bower, Keith4 aut
700	1	a George, Charles4 aut
700	1	a Hayman, Garry D.4 aut
700	1	a Aalto, Tuula4 aut
700	1	a Lohila, Annalea4 aut
700	1	a Aurela, Mika4 aut
700	1	a Laurila, Tuomas4 aut
700	1	a Crill, Patrick M.u Stockholms universitet,Institutionen för geologiska vetenskaper4 aut0 (Swepub:su)pcril
700	1	a McCalley, Carmody K.4 aut
700	1	a Nisbet, Euan G.4 aut
710	2	a Stockholms universitetb Institutionen för geologiska vetenskaper4 org
773	0	t Global Biogeochemical Cyclesg 31:3, s. 605-623q 31:3<605-623x 0886-6236x 1944-9224
856	4	u https://doi.org/10.1002/2016GB005504y Fulltext
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-143469
856	4 8	u https://doi.org/10.1002/2016GB005504

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