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Table 4

Nighttime ozone trends at eight mountaintop sites for winter (DJF), spring (MAM), summer (JJA) and autumn (SON)a. DOI: https://doi.org/10.1525/elementa.291.t4

Site name lat. long. alt.(m a.s.l.)Years with dataTrend, full recordp-valueTrend, 2000–2015p-value

 
Mauna Loa
19.5°N, 155.6°W 3397 m 
1973–2015 DJF
MAM
JJA
SON 
0.10 (0.03, 0.21)
0.10 (–0.04, 0.23)
0.16 (0.09, 0.23)
0.24 (0.14, 0.34) 
0.01
0.15
0.00
0.00 
–0.05 (–0.63, 0.33)
0.60 (0.09, 1.13)
0.18 (–0.06, 0.40)
–0.26 (–0.67, 0.29) 
0.69
0.04
0.14
0.32 
Izaña
28.3°N, 16.5°W 2367 m 
1987–2015 DJF
MAM
JJA
SON 
0.19 (0.09, 0.28)
0.14 (0.02, 0.27)
0.14 (–0.02, 0.28)
0.13 (0.02, 0.21) 
0.01
0.03
0.07
0.02 
0.00 (–0.16, 0.29)
0.07 (–0.20, 0.29)
0.12 (–0.24, 0.42)
0.06 (–0.16, 0.26) 
1.00
0.62
0.69
0.89 
Mt. Waliguan
36.3°N, 100.9°E 3810 m 
1994–2015 DJF
MAM
JJA
SON 
0.11 (0.01, 0.20)
0.20 (0.10, 0.32)
0.19 (–0.06, 0.37)
0.32 (0.17, 0.36) 
0.04
0.00
0.09
0.00 
0.08 (–0.10, 0.23)
0.18 (–0.03, 0.37)
0.15 (–0.14, 0.48)
0.32 (0.15, 0.36) 
0.69
0.06
0.32
0.00 
Mt Bachelorb
44.0°N, 121.7°W 2763 m 
2004–2015 DJF
MAM
JJA
SON 
too few data
0.64 (0.02, 1.24)
0.77 (–0.11, 1.58)
1.12 (0.83, 1.48) 

0.05
0.09
0.00 
too few data
0.64 (0.02, 1.24)
0.77 (–0.11, 1.58)
1.12 (0.83, 1.48) 

0.05
0.09
0.00 
Whiteface Mt Summit
44.4°N, 73.9°W 1483 m 
1975–2015 DJF
MAM
JJA
SON 
too few data
–0.07 (–0.24, 0.08)
0.38 (0.49, –0.22)
–0.04 (–0.11, 0.05) 

0.29
0.00
0.38 
too few data
too few data
0.71 (1.61, –0.07)
–0.29 (–0.85, 0.12) 


0.02
0.13 
Jungfraujoch
46.5°N, 8.0°E 3580 m 
1986–2015 DJF
MAM
JJA
SON 
0.15 (0.04, 0.29)
0.05 (–0.06, 0.19)
–0.05 (–0.16, 0.11)
0.13 (0.03, 0.23) 
0.01
0.30
0.42
0.01 
–0.07 (–0.21, 0.05)
0.15 (0.24, –0.01)
–0.12 (–0.37, 0.17)
0.03 (–0.09, 0.14) 
0.26
0.03
0.39
0.56 
Zugspitze
47.4°N, 11.0°E
2962 m 
1978–2015 DJF
MAM
JJA
SON 
0.31 (0.19, 0.42)
0.20 (0.04, 0.35)
0.12 (–0.02, 0.28)
0.15 (0.07, 0.26) 
0.00
0.01
0.08
0.00 
–0.08 (–0.25, 0.05)
0.27 (0.340.13)
–0.20 (–0.49, 0.13)
–0.07 (–0.31, 0.10) 
0.12
0.01
0.30
0.44 
Summit
72.6°N, 38.5°W
3212 m 
2000–2015 DJF
MAM
JJA
SON 
0.02 (–0.26, 0.45)
0.32 (1.04, –0.05)
too few data
–0.08 (–0.30, 0.14) 
0.85
0.02

0.32 
0.02 (–0.26, 0.45)
0.32 (1.04, –0.05)
too few data
–0.08 (–0.30, 0.14) 
0.86
0.02

0.32 
Site name lat. long. alt.(m a.s.l.)Years with dataTrend, full recordp-valueTrend, 2000–2015p-value

 
Mauna Loa
19.5°N, 155.6°W 3397 m 
1973–2015 DJF
MAM
JJA
SON 
0.10 (0.03, 0.21)
0.10 (–0.04, 0.23)
0.16 (0.09, 0.23)
0.24 (0.14, 0.34) 
0.01
0.15
0.00
0.00 
–0.05 (–0.63, 0.33)
0.60 (0.09, 1.13)
0.18 (–0.06, 0.40)
–0.26 (–0.67, 0.29) 
0.69
0.04
0.14
0.32 
Izaña
28.3°N, 16.5°W 2367 m 
1987–2015 DJF
MAM
JJA
SON 
0.19 (0.09, 0.28)
0.14 (0.02, 0.27)
0.14 (–0.02, 0.28)
0.13 (0.02, 0.21) 
0.01
0.03
0.07
0.02 
0.00 (–0.16, 0.29)
0.07 (–0.20, 0.29)
0.12 (–0.24, 0.42)
0.06 (–0.16, 0.26) 
1.00
0.62
0.69
0.89 
Mt. Waliguan
36.3°N, 100.9°E 3810 m 
1994–2015 DJF
MAM
JJA
SON 
0.11 (0.01, 0.20)
0.20 (0.10, 0.32)
0.19 (–0.06, 0.37)
0.32 (0.17, 0.36) 
0.04
0.00
0.09
0.00 
0.08 (–0.10, 0.23)
0.18 (–0.03, 0.37)
0.15 (–0.14, 0.48)
0.32 (0.15, 0.36) 
0.69
0.06
0.32
0.00 
Mt Bachelorb
44.0°N, 121.7°W 2763 m 
2004–2015 DJF
MAM
JJA
SON 
too few data
0.64 (0.02, 1.24)
0.77 (–0.11, 1.58)
1.12 (0.83, 1.48) 

0.05
0.09
0.00 
too few data
0.64 (0.02, 1.24)
0.77 (–0.11, 1.58)
1.12 (0.83, 1.48) 

0.05
0.09
0.00 
Whiteface Mt Summit
44.4°N, 73.9°W 1483 m 
1975–2015 DJF
MAM
JJA
SON 
too few data
–0.07 (–0.24, 0.08)
0.38 (0.49, –0.22)
–0.04 (–0.11, 0.05) 

0.29
0.00
0.38 
too few data
too few data
0.71 (1.61, –0.07)
–0.29 (–0.85, 0.12) 


0.02
0.13 
Jungfraujoch
46.5°N, 8.0°E 3580 m 
1986–2015 DJF
MAM
JJA
SON 
0.15 (0.04, 0.29)
0.05 (–0.06, 0.19)
–0.05 (–0.16, 0.11)
0.13 (0.03, 0.23) 
0.01
0.30
0.42
0.01 
–0.07 (–0.21, 0.05)
0.15 (0.24, –0.01)
–0.12 (–0.37, 0.17)
0.03 (–0.09, 0.14) 
0.26
0.03
0.39
0.56 
Zugspitze
47.4°N, 11.0°E
2962 m 
1978–2015 DJF
MAM
JJA
SON 
0.31 (0.19, 0.42)
0.20 (0.04, 0.35)
0.12 (–0.02, 0.28)
0.15 (0.07, 0.26) 
0.00
0.01
0.08
0.00 
–0.08 (–0.25, 0.05)
0.27 (0.340.13)
–0.20 (–0.49, 0.13)
–0.07 (–0.31, 0.10) 
0.12
0.01
0.30
0.44 
Summit
72.6°N, 38.5°W
3212 m 
2000–2015 DJF
MAM
JJA
SON 
0.02 (–0.26, 0.45)
0.32 (1.04, –0.05)
too few data
–0.08 (–0.30, 0.14) 
0.85
0.02

0.32 
0.02 (–0.26, 0.45)
0.32 (1.04, –0.05)
too few data
–0.08 (–0.30, 0.14) 
0.86
0.02

0.32 

a Boldface indicates trend values that are statistically significant at p-value < 0.05. Trend values in parentheses indicate the high and low trend values that bound the 95% confidence interval.

bThe Mt. Bachelor data were updated in the TOAR Surface Ozone Database on February 22, 2018 to remove the hourly observations for Sept 1–Dec 31, 2006 and Sept 1– Dec 31, 2010 due to newly identified instrument problems during those time periods. The trends in this table were updated accordingly.

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