Microbial Methane From Methylphosphonate Isotopically Records Source
AffiliationUniv Arizona, Dept Environm Sci
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationTaenzer, L., Carini, P. C., Masterson, A. M., Bourque, B., Gaube, J. H., & Leavitt, W. D. (2020). Microbial methane from methylphosphonate isotopically records source. Geophysical Research Letters, 47, e2019GL085872. https://doi. org/10.1029/2019GL085872
JournalGEOPHYSICAL RESEARCH LETTERS
RightsCopyright © 2020. American Geophysical Union. All Rights Reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractMethane is a potent greenhouse gas commonly supersaturated in the oxic surfaces waters of oceans and lakes, yet canonical microbial methanogens are obligate anaerobes. One proposed methane production pathway involves microbial degradation of methylphosphonate (MPn), which can proceed in the presence of oxygen. Directly tracing dissolved methane to its source in oxic waters, however, remains a challenge. To address this knowledge gap, we quantified the carbon isotopic fractionation between substrate MPn and product methane (1.3 parts per thousand) in lab experiments, which was 1 to 2 orders of magnitude smaller than canonical pathways of microbial methanogenesis (20 to 100 parts per thousand). Together, these results indicated that microbial catabolism of MPn is a source of methane in surface oceans and lake waters, but to differentiate sources of MPn in nature a further accounting of all sources is necessary. Methane from this pathway must be considered in constraining the marine carbon cycle and methane budget.
Note6 month embargo; published online: 17 January 2020
VersionFinal published version