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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Revisiting the Global Methane Cycle Through Expert Opinion
Earth's future, Vol.12(6)
06/2024
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Abstract
An accurate quantification of global methane sources and sinks is imperative for assessing realistic pathways to mitigate climate change. A key challenge of quantifying the Global Methane Budget (Saunois et al., 2020, https://doi.org/10.5194/essd-12-1561-2020) is the lack of consistency in uncertainties between sectors. Here we provide a new perspective on bottom-up (BU) and top-down (TD) methane uncertainties by using an expert opinion analysis based on a questionnaire conducted in 2021. Expectedly, experts rank highest uncertainty and lowest confidence levels in the Global Methane Budget related to natural sources in BU budgets. Here, we further reveal specific uncertainty types and introduce a ranking system for uncertainties in each sector. We find that natural source uncertainty is related particularly to driver data uncertainty in freshwater, vegetation, and coastal/ocean sources, as well as parameter uncertainty in wetland models. Reducing uncertainties, most notably in aquatic and wetland sources will help balance future BU and TD global methane budgets. We suggest a new methane source partitioning over gradients of human disturbance and demonstrate that 76.3% (75.8%–79.4%) or 561 (443–700) Tg CH4 yr−1 of global emissions can be attributed to moderately impacted, man-made, artificial, or fully anthropogenic sources and 23.7% (20.6%–24.2%) or 174 (115–223) Tg CH4 yr−1 to natural and low impacted methane sources. Finally, we identify current research gaps and provide a plan of action to reduce current uncertainties in the Global Methane Budget.
Details
- Title
- Revisiting the Global Methane Cycle Through Expert Opinion
- Creators
- Judith A. Rosentreter - Yale UniversityLewis Alcott - Yale UniversityTaylor Maavara - Yale UniversityXin Sun - Yale UniversityYong Zhou - Yale UniversityNoah J. Planavsky - Yale UniversityPeter A. Raymond - Yale University
- Publication Details
- Earth's future, Vol.12(6)
- Publisher
- John Wiley & Sons Ltd.; WASHINGTON
- Number of pages
- 16
- Grant note
- Yale University Yale Institute for Biospheric Studies
- Identifiers
- 991013203307902368
- Copyright
- © 2024. The Author(s). This is an open access article under the terms of the Creative Commons Attribution License. Open access publishing facilitated by Southern Cross University, as part of the Wiley - Southern Cross University agreement via the Council of Australian University Librarians.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article