However, to produce such a significant trend, the Q10 parameter (temperature sensitivity of CH 4 emissions) in the wetland models would need to be much higher than the range of 2–3 from LPJ-wsl and WetCHARTs or the measurement-based average of 2.57 from FLUXNET-CH4 [ 54 ].
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Anthropogenic emission is the main contributor to the rise of atmospheric methane during 1993-2017.
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The sentences
In contrast to IFF CH4 , AGW CH4 shows a significantly increasing contribution to the isotope budget from 2000–2006 to the post-2007 period, with a positive trend of 5%–7% relative to 1993–1999.
The lower RMSE of Worden (2017)-based scenarios supports the hypothesis of a decreasing trend in BB CH4 during the post-2007 period, as suggested by inversion modeling based on satellite measurements of carbon monoxide [ 47 ].