Rapid shift in methane carbon isotopes suggests microbial emissions drove record high atmospheric methane growth in 2020-2022
成果类型：
Article
署名作者：
Michel, Sylvia Englund; Lan, Xin; Miller, John; Tans, Pieter; Clark, J. Reid; Schaefer, Hinrich; Sperlich, Peter; Brailsford, Gordon; Morimoto, Shinji; Moossen, Heiko; Li, Jianghanyang
署名单位：
University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder; University of Colorado System; University of Colorado Boulder; National Oceanic Atmospheric Admin (NOAA) - USA; National Institute of Water & Atmospheric Research (NIWA) - New Zealand; Tohoku University; Max Planck Society
刊物名称：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN/ISSBN：
0027-12303
DOI：
10.1073/pnas.2411212121
发表日期：
2024-10-29
关键词：
摘要：
The growth rate of the atmospheric abundance of methane (CH4) reached a record high of 15.4 ppb yr-1 between 2020 and 2022, but the mechanisms driving the accelerated CH4 growth have so far been unclear. In this work, we use measurements of the 13C:12C Network and a box model to investigate potential drivers for the rapid CH4 growth. These measurements show that the record- high CH4 growth in 2020-2022 was accompanied by a sharp decline in S13CCH4, indicating that the increase in CH4 abundance was mainly driven by increased emissions from microbial sources such as wetlands, waste, and agriculture. We use our box model to reject increasing fossil fuel emissions or decreasing hydroxyl radical sink as the dominant driver for increasing global methane abundance.