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Table 2.

Trend statistics for the annual ratios of Boulder Atmospheric Observatory (BAO)/Niwot Ridge (NWR) methane mole fractions for 2008−2016 using individual BAO samples with wind directions from the northeast quadrant and corresponding NWR monthly medians for each individual month. DOI: https://doi.org/10.1525/elementa.2020.00136.t2

MethaneFull YearPhotochemical Season (May–September)
Slope (yr–1)2 σ Standard Deviation (yr–1)P-ValueSlope (yr–1)2 σ Standard Deviation (yr–1)P-Value
Mean –0.001 0.006 0.279 –0.001 0.005 0.097 
Median –0.001 0.005 0.175 0.000 0.004 0.813 
5th %ile –0.001 0.003 0.155 –0.001 0.004 0.498 
25th %ile –0.001 0.004 0.206 0.000 0.005 0.644 
75th %ile –0.002 0.008 0.163 –0.002 0.006 0.070 
95th %ile –0.002 0.021 0.598 –0.005 0.014 0.085 
MethaneFull YearPhotochemical Season (May–September)
Slope (yr–1)2 σ Standard Deviation (yr–1)P-ValueSlope (yr–1)2 σ Standard Deviation (yr–1)P-Value
Mean –0.001 0.006 0.279 –0.001 0.005 0.097 
Median –0.001 0.005 0.175 0.000 0.004 0.813 
5th %ile –0.001 0.003 0.155 –0.001 0.004 0.498 
25th %ile –0.001 0.004 0.206 0.000 0.005 0.644 
75th %ile –0.002 0.008 0.163 –0.002 0.006 0.070 
95th %ile –0.002 0.021 0.598 –0.005 0.014 0.085 
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