Fig. 2.

Most likely solution. Left column shows observed (black triangles) and modeled (solid lines) concentrations of atmospheric CH₄ (Top), ${\delta }^{13}$CH₄ (Middle), and methyl chloroform (Bottom). The Northern Hemisphere is yellow and the Southern Hemisphere is blue. Right column shows the methane emissions (plotted as a deviation from the constant prior emissions; Top), the isotopic composition of the methane emissions (Middle), and the OH anomaly relative to a global mean concentration of $1\times {10}^6$ molecules (molec)/cm³ (Bottom).