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First Observation of Methane’s Increasing Greenhouse Effect at the Earth’s Surface
Published: April 02, 2018
Posted: November 19, 2019

Predictions of the direct impacts of greenhouse gases must account for local temperature and humidity conditions.

The Science
Methane traps heat in the atmosphere. For the first time, scientists directly measured the increasing greenhouse effect of methane at the Earth's surface. Measuring the atmospheric absorption of methane is complicated and can be impacted by other gases. The team tracked a rise in the warming effect of methane, one of the most important greenhouse gases for the Earth's atmosphere, over 10 years at a field site in northern Oklahoma.

The Impact
This study offers direct measurements. Such measurements are extremely complex. This study shows increasing methane concentrations are leading to an increasing greenhouse effect in the Earth's atmosphere. It also shows that local temperature and humidity conditions must be taken into account to predict the direct impacts of greenhouse gases. 

Summary
While atmospheric methane concentrations plateaued between 1995 and 2006, they have since increased and are expected to impact the surface energy balance. The relationship between methane radiative forcing and methane mixing ratios has previously only been calculated using radiative transfer models. Methane spectroscopy is complicated, and methane absorption can be impacted by other atmospheric gases, including water vapor. Researchers determined the methane radiative forcing using a large suite of atmospheric observations from more than 10 years of observations at the U.S. Department of Energy's Atmospheric Radiation Measurement facility Southern Great Plains site in Oklahoma. One major advance in this study is that researchers account for the spectroscopic interactions between methane and water vapor as well as the vertical distribution of water vapor. They detected no significant trend in methane forcing before 2007, but found a significant trend after 2007. They also showed that both methane and water vapor contribute significantly to the methane radiative forcing signal.  

Biological and Environmental Research Program Managers
Shaima Nasiri
U.S. Department of Energy Office of Science, Office of Biological and Environmental Research
Climate and Environmental Sciences Division (SC-23.1)
Atmospheric System Research
shaima.nasiri@science.doe.gov

Sally McFarlane
U.S. Department of Energy Office of Science, Office of Biological and Environmental Research
Climate and Environmental Sciences Division (SC-23.1)
DOE Atmospheric Radiation Measurement User Facility
sally.mcfarlane@science.doe.gov

Funding
This material is based on work supported by the U.S. Department of Energy (DOE), Office of Science, Office of Biological and Environmental Research, as part of the Atmospheric System Research program, Atmospheric Radiation Measurement (ARM) Program, the Terrestrial Ecosystem Science program, and the ARM aerial facility. Resources of the National Energy Research Scientific Computing Center were used. Work at Lawrence Livermore National Laboratory was performed under the auspices of DOE by Lawrence Livermore National Laboratory. The National Oceanic and Atmospheric Administration’s Global Monitoring Division provided data.

Publications
Feldman, D. R., W. D. Collins, S. C. Biraud, M. D. Risser, D. D. Turner, P. J. Gero, J. Tadic, D. Helmig, S. Xie, E. J. Mlawer, T. Shippert, and M. S. Torn. "Observationally derived rise in methane surface forcing mediated by water vapour trends." Nature Geoscience 11, 238 (2018). [DOI:110.1038/s41561-018-0085-9]

Related Links
Lawrence Berkeley National Laboratory press release: First Direct Observations of Methane's Increasing Greenhouse Effect at the Earth's Surface  

Topic Areas:

  • Research Area: Atmospheric System Research
  • Research Area: Terrestrial Ecosystem Science
  • Research Area: Carbon Cycle, Nutrient Cycling
  • Cross-Cutting: Scientific Computing and SciDAC
  • Facility: DOE ARM User Facility

Division: SC-33.1 Earth and Environmental Sciences Division, BER

 

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