δ(13)C-CH4 reveals CH4 variations over oceans from mid-latitudes to the Arctic.

Sci Rep · 2015 · PMC4555175 · PMID 26323236

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a decreasing trendno p-value reported

The CO concentrations showed a decreasing trend up to about 50°N, indicating a decrease in local contribution by anthropogenic sources, such as fossil fuels, north of 50°N.

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