同位素
甲烷
大气甲烷
大气科学
环境科学
焊剂(冶金)
温室气体
大气化学
化石燃料
同位素
环境化学
化学
地质学
生态学
物理
生物
有机化学
量子力学
分子
臭氧
作者
Mojhgan Haghnegahdar,Jiayang Sun,Nicole Hultquist,Nora Hamovit,Nami Kitchen,John M. Eiler,Shuhei Ono,Stephanie A. Yarwood,Alan J. Kaufman,Russell R. Dickerson,Amaury Bouyon,Cédric Magen,James Farquhar
标识
DOI:10.1073/pnas.2305574120
摘要
We apply a recently developed measurement technique for methane (CH 4 ) isotopologues * (isotopic variants of CH 4 — 13 CH 4 , 12 CH 3 D, 13 CH 3 D, and 12 CH 2 D 2 ) to identify contributions to the atmospheric burden from fossil fuel and microbial sources. The aim of this study is to constrain factors that ultimately control the concentration of this potent greenhouse gas on global, regional, and local levels. While predictions of atmospheric methane isotopologues have been modeled, we present direct measurements that point to a different atmospheric methane composition and to a microbial flux with less clumping (greater deficits relative to stochastic) in both 13 CH 3 D and 12 CH 2 D 2 than had been previously assigned. These differences make atmospheric isotopologue data sufficiently sensitive to variations in microbial to fossil fuel fluxes to distinguish between emissions scenarios such as those generated by different versions of EDGAR (the Emissions Database for Global Atmospheric Research), even when existing constraints on the atmospheric CH 4 concentration profile as well as traditional isotopes are kept constant.
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