CH4 for the past 30 years (IMAGE)

National Institute for Environmental Studies

CH4 for the past 30 years

Caption

Evolution of the observed and simulated concentrations (top) and growth rates (bottom) in the southern hemisphere (SH) during 1988-2016. Measurement data from four remote marine stations in the SH (namely, Cape Grim, Palmer Station, Syowa and South Pole) are used. The shaded background in the bottom panel shows the 3 distinct CH4 growth rate phases (Periods 1, 2 and 3). Also shown in the top panel are human-induced emissions that played important roles in the growth rate variations of atmospheric CH4.

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