University of California Press

Figure 2

Vertical profiles of O3 at Trinidad Head, Cheeka Peak, Mt. Bachelor Observatory, and Chews Ridge. Spring (left) and summer (right) vertical profiles (meters above sea level, m asl) as measured by ozonesondes (https://www.esrl.noaa.gov/gmd/) from Trinidad Head, California (2007–2017) and continuous surface observations at Cheeka Peak, Washington, at 500 m asl (2010–2016) (blue symbols), Mt. Bachelor Observatory, central Oregon, at 2763 m asl (2007–2016) (blue symbols), and Chews Ridge Observatory at 1500 m asl on the ridgeline of the Santa Lucia coastal mountain range in southern California (2012–2016) (blue symbols). For the Trinidad Head sonde data, blue lines represent individual sondes; red thin lines represent the 2nd and 98th percentiles, red dashed lines the 10th and 90th percentiles, and thick red lines the 50th percentile. From left to right, the blue symbols for the surface sites represent the 2nd, 10th, 50th, 90th and 98th percentiles of nighttime O3 observations at Mt. Bachelor and Cheeka Peak and nighttime onshore O3 observations at Chews Ridge. Black vertical lines reference the 70 ppb NAAQS. The data for Chews Ridge were provided by Ian Faloona (University of California Davis). The Cheeka Peak data were obtained from the EPA AQS network. The MBO data are from the University of Washington data archive (https://digital.lib.washington.edu/Researchworks). DOI: https://doi.org/10.1525/elementa.309.f2

Vertical profiles of O₃ at Trinidad Head, Cheeka Peak, Mt. Bachelor Observatory, and Chews Ridge. Spring (left) and summer (right) vertical profiles (meters above sea level, m asl) as measured by ozonesondes (https://www.esrl.noaa.gov/gmd/) from Trinidad Head, California (2007–2017) and continuous surface observations at Cheeka Peak, Washington, at 500 m asl (2010–2016) (blue symbols), Mt. Bachelor Observatory, central Oregon, at 2763 m asl (2007–2016) (blue symbols), and Chews Ridge Observatory at 1500 m asl on the ridgeline of the Santa Lucia coastal mountain range in southern California (2012–2016) (blue symbols). For the Trinidad Head sonde data, blue lines represent individual sondes; red thin lines represent the 2^nd and 98^th percentiles, red dashed lines the 10^th and 90^th percentiles, and thick red lines the 50^th percentile. From left to right, the blue symbols for the surface sites represent the 2^nd, 10^th, 50^th, 90^th and 98^th percentiles of nighttime O₃ observations at Mt. Bachelor and Cheeka Peak and nighttime onshore O₃ observations at Chews Ridge. Black vertical lines reference the 70 ppb NAAQS. The data for Chews Ridge were provided by Ian Faloona (University of California Davis). The Cheeka Peak data were obtained from the EPA AQS network. The MBO data are from the University of Washington data archive (https://digital.lib.washington.edu/Researchworks). DOI: https://doi.org/10.1525/elementa.309.f2

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