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Table 3.

Trend statistics for the ratio of i-pentane to n-pentane at Boulder Atmospheric Observatory for 2008−2015 using daytime samples with wind directions from the northeast quadrant. DOI: https://doi.org/10.1525/elementa.2020.00136.t3

Full YearPhotochemical Season (May–September)
i-pentane/n-pentaneSlope (yr–1)2 σ Standard Deviation (yr–1)P-ValueSlope (yr–1)2 σ Standard Deviation (yr–1)P-Value
Mean –0.017 0.010 0.000 –0.021 0.019 0.001 
Median –0.014 0.010 0.000 –0.016 0.014 0.001 
5th %ile –0.019 0.005 0.000 –0.020 0.037 0.023 
25th %ile –0.015 0.007 0.000 –0.017 0.016 0.001 
75th %ile –0.016 0.015 0.001 –0.019 0.024 0.005 
95th %ile –0.024 0.023 0.001 –0.038 0.047 0.004 
Full YearPhotochemical Season (May–September)
i-pentane/n-pentaneSlope (yr–1)2 σ Standard Deviation (yr–1)P-ValueSlope (yr–1)2 σ Standard Deviation (yr–1)P-Value
Mean –0.017 0.010 0.000 –0.021 0.019 0.001 
Median –0.014 0.010 0.000 –0.016 0.014 0.001 
5th %ile –0.019 0.005 0.000 –0.020 0.037 0.023 
25th %ile –0.015 0.007 0.000 –0.017 0.016 0.001 
75th %ile –0.016 0.015 0.001 –0.019 0.024 0.005 
95th %ile –0.024 0.023 0.001 –0.038 0.047 0.004 
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