DOI: 10.1029/2004jd005650
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Abstract: [1] We present methane mixing ratio and d 13C time series measured at Baring Head, New Zealand, and Scott Base, Antarctica, over the years [1991][1992][1993][1994][1995][1996][1997][1998][1999][2000][2001][2002][2003]. These data demonstrate that the apparent kinetic isotope effect (KIE) of the methane atmospheric sink (derived from the amplitudes of the mixing ratio and d 13C seasonal cycles) is generally much larger than would be expected if the sink were the hydroxyl radical alone and has changed significa…

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