Related Experiment Video
Updated: Jun 2, 2026
08:18
Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
Published on: June 12, 2016
Global atmospheric methane: budget, changes and dangers.
Edward J Dlugokencky1, Euan G Nisbet, Rebecca Fisher
1US National Oceanic and Atmospheric Administration, Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, USA. ed.dlugokencky@noaa.gov
Summary
Reducing atmospheric methane (CH4) emissions offers quick climate benefits due to its short lifespan. Accurate methane budgets and source attribution are crucial for effective mitigation strategies and emissions trading schemes.
Area of Science:
- Atmospheric Science
- Climate Change Research
- Greenhouse Gas Budget Analysis
Background:
- Atmospheric methane (CH4) has increased by 2.5 times since 1750, contributing significantly to radiative forcing.
- Methane's short atmospheric lifetime makes emission reductions a rapid climate mitigation strategy.
- Accurate quantification of methane's budget, including emissions and sinks, is essential for effective climate policy.
Purpose of the Study:
- To assess the current understanding of the global methane budget and its sources.
- To evaluate the capabilities of existing observation networks for methane emission monitoring.
- To identify needs for improved methane monitoring, particularly for regional and national scales relevant to emissions trading.
Main Methods:
- Analysis of atmospheric methane abundance and its rate of increase.
- Estimation of methane's atmospheric lifetime.
- Review of current observation networks and isotopic measurement capabilities (δ(13)C, δD, δ(14)C).
Main Results:
- Total global methane emissions are constrained between 500-600 Tg CH4 yr(-1).
- Estimates of methane emissions by source sector show significant variability (up to a factor of 2).
- Current observation networks are adequate for global-scale constraints but insufficient for regional/national verification.
Conclusions:
- Enhanced observation networks, including isotopic measurements, are needed for improved methane budget constraints and source attribution.
- Isotopic analysis is valuable for distinguishing emission sources, especially at regional scales.
- Effective methane mitigation requires quantitative assessment of changing emissions, balancing cost-effective reductions with increasing emissions from economic development.
Related Concept Videos
01:27Microbes and Climate Change
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
01:14The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
01:16What is Climate?
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
01:50Threats to Biodiversity
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
01:26Microbes and Methanogenesis
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...