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Sökning: WFRF:(Wofsy Steven C.) > (2012-2014) > Mass fluxes and iso...

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FältnamnIndikatorerMetadata
00003089naa a2200385 4500
001oai:DiVA.org:su-79756
003SwePub
008120911s2012 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-797562 URI
0247 a https://doi.org/10.1029/2011JD0169602 DOI
040 a (SwePub)su
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Santoni, Gregory W.4 aut
2451 0a Mass fluxes and isofluxes of methane (ch4) at a new hampshire fen measured by a continuous wave quantum cascade laser spectrometer
264 1c 2012
338 a print2 rdacarrier
500 a AuthorCount:9;
520 a We have developed a mid-infrared continuous-wave quantum cascade laser direct-absorption spectrometer (QCLS) capable of high frequency (>= 1 Hz) measurements of (CH4)-C-12 and (CH4)-C-13 isotopologues of methane (CH4) with in situ 1-s RMS delta C-13(CH4) precision of 1.5 parts per thousand and Allan-minimum precision of 0.2 parts per thousand. We deployed this QCLS in a well-studied New Hampshire fen to compare measurements of CH4 isoflux by eddy covariance (EC) to Keeling regressions of data from automated flux chamber sampling. Mean CH4 fluxes of 6.5 +/- 0.7 mg CH4 m(-2) hr(-1) over two days of EC sampling in July, 2009 were indistinguishable from mean autochamber CH4 fluxes (6.6 +/- 0.8 mgCH(4) m(-2) hr(-1)) over the same period. Mean delta C-13(CH4) composition of emitted CH4 calculated using EC isoflux methods was -71 +/- 8 parts per thousand (95% C.I.) while Keeling regressions of 332 chamber closing events over 8 days yielded a corresponding value of -64.5 +/- 0.8 parts per thousand Ebullitive fluxes, representing similar to 10% of total CH4 fluxes at this site, were on average 1.2 parts per thousand enriched in C-13 compared to diffusive fluxes. CH4 isoflux time series have the potential to improve process-based understanding of methanogenesis, fully characterize source isotopic distributions, and serve as additional constraints for both regional and global CH4 modeling analysis.
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskapx Meteorologi och atmosfärforskning0 (SwePub)105082 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Meteorology and Atmospheric Sciences0 (SwePub)105082 hsv//eng
7001 a Lee, Ben H.4 aut
7001 a Goodrich, Jordan P.4 aut
7001 a Varner, Ruth K.4 aut
7001 a Crill, Patrick M.u Stockholms universitet,Institutionen för geologiska vetenskaper4 aut0 (Swepub:su)pcril
7001 a McManus, J. Barry4 aut
7001 a Nelson, David D.4 aut
7001 a Zahniser, Mark S.4 aut
7001 a Wofsy, Steven C.4 aut
7102 a Stockholms universitetb Institutionen för geologiska vetenskaper4 org
7730 t Journal of Geophysical Researchg 117, s. D10301-q 117<D10301-x 0148-0227x 2156-2202
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-79756
8564 8u https://doi.org/10.1029/2011JD016960

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