Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond

Related Stories

Methane emissions vastly surpass previous estimates

Nov. 25, 2013 — Government calculations of total U.S. methane emissions may underestimate the true values by 50 percent, a new study finds. The results are published the week of November 25 in the early online edition of the Proceedings of the National Academy of Sciences, and cast doubt on a recent Environmental Protection Agency decision to downscale its emissions estimate.

Carnegie's Anna Michalak, Harvard's Scot Miller and Steven Wofsy, and colleagues used atmospheric methane observations from across North America in 2007 and 2008 to improve estimates of methane gas emissions from a variety of human sources, including agriculture and fossil fuel drilling and refining.

The study found large discrepancies with government estimates in some regions of the United States, particularly the south-central US, where total methane emissions were 2.7 times greater than those reported in most inventories. Emissions from oil and gas drilling and processing in this region could account for 50% of that total, representing a source of methane almost five times higher than in the most commonly used global emissions database.

Methane is the second-most important greenhouse gas after carbon dioxide, and the study findings may help inform national and state greenhouse gas reduction strategies, according to the authors.

The team used modeling tools developed by Michalak's lab that make it possible to trace variations in atmospheric methane measurements back to emissions throughout the U.S., and to relate the emissions to known economic sectors. The methods thereby provide a direct constraint on total emissions, as well as provide insight into what is behind them.


Journal Reference:

  1. S. M. Miller, S. C. Wofsy, A. M. Michalak, E. A. Kort, A. E. Andrews, S. C. Biraud, E. J. Dlugokencky, J. Eluszkiewicz, M. L. Fischer, G. Janssens-Maenhout, B. R. Miller, J. B. Miller, S. A. Montzka, T. Nehrkorn, C. Sweeney. Anthropogenic emissions of methane in the United States. Proceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1314392110

Note: If no author is given, the source is cited instead.

The source of this article can be found at: http://carnegiescience.edu/news/methane_emissions_vastly_surpass_previous_estimates" rel="nofollow

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners