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There is an Arctic methane deposit page but I am not sure wether the below table fits into it, apart from that it seems I currently can't edit the project anyways. John had just posted on his google+ account a link to graphs of methane stations. I picked now some stations around the northpole and some more southern and roughly read of (unfortuately rather unprecise) the values for the years 1992, 2000 and 2014. Result: the methane values in the north are quite higher than in the southern parts of the world. This is of course no statistics, but the pattern looks to me clearly visible:
Here around the north pole:
Summit Greenland 1998:1825 2014:1900
Shemya Island, Alaska 1992:1810 2000:1850 2014:1910
Tiksi, Russia 2014:1925
Ny-Alesund, Svalbard, Norway and Sweden 1992:1825 2000:1850 2014:1910
Alert, Nunavut, Canda 1992:1825 2000:1859 2014:1950
Not so northern but eventually subject to permafrost issues:
The typical southern values are way lower like e.g.:
Ragged Point Barbados 1992:1730 2000:1840 2014:1870
and even in Antarctica it is lower (part of the different concentration is probably partially due to the wind, but as the values in Antartica show that this component seems not so high):
Syowa Station, Antarctica, Japan1992:1670 2000:1725 2014:1750
There are though some outliers like
Moody, Texas, United States, where the methane value sometimes shooted over 2000....guess there are some gas fields.