Figure : global-monthly-mean-methane-and-carbon-dioxide-concentrations-and-global-annual-emissions-of-ch4-and-non-fossil-fuel-annual-emissions-of-co2-

Global Monthly Mean Concentrations of Methane (CH4; red line) and Carbon Dioxide (CO2; blue line) and Global Annual Emissions of CH4 (red bars) and Nonfossil Fuel Annual Emissions of CO2 (blue bars)

Figure 8.1

National Oceanic and Atmospheric Administration
Andrew R. Jacobson

This figure appears in chapter 8 of the Second State of the Carbon Cycle Report (SOCCR2): A Sustained Assessment Report report.

Global CH4 and CO2 concentrations (in parts per billion [ppb] and parts per million [ppm], respectively) are from the National Oceanic and Atmospheric Administration’s Marine Boundary Layer product. Methane emissions were generated from annual growth rates of marine boundary layer CH4, assuming a CH4 lifetime of 9.1 years. Carbon dioxide emissions were generated from annual growth rates of marine boundary layer CO2, converted to emissions using a factor of 2,128 teragrams of carbon (Tg C) per year per ppm and removing anthropogenic fossil fuel emissions. From 1980 to 2016, these global fossil fuel emissions grew steadily from about 5,000 Tg C per year to about 9,200 Tg C per year (Boden et al., 2017). Dotted vertical lines in 2007 and 2016 represent approximate reference times for publication of the first and second State of the Carbon Cycle reports.

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The time range for this figure is January 01, 1979 (00:00 AM) to January 01, 2016 (00:00 AM).

This figure was created on February 05, 2018.

This figure was submitted on February 11, 2019.

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