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• W2317491880 abstract "Abstract Sonde‐based climatologies of tropospheric ozone (O 3 ) are vital for developing satellite retrieval algorithms and evaluating chemical transport model output. Typical O 3 climatologies average measurements by latitude or region, and season. A recent analysis using self‐organizing maps (SOM) to cluster ozonesondes from two tropical sites found that clusters of O 3 mixing ratio profiles are an excellent way to capture O 3 variability and link meteorological influences to O 3 profiles. Clusters correspond to distinct meteorological conditions, e.g., convection, subsidence, cloud cover, and transported pollution. Here the SOM technique is extended to four long‐term U.S. sites (Boulder, CO; Huntsville, AL; Trinidad Head, CA; and Wallops Island, VA) with 4530 total profiles. Sensitivity tests on k ‐means algorithm and SOM justify use of 3 × 3 SOM (nine clusters). At each site, SOM clusters together O 3 profiles with similar tropopause height, 500 hPa height/temperature, and amount of tropospheric and total column O 3 . Cluster means are compared to monthly O 3 climatologies. For all four sites, near‐tropopause O 3 is double (over +100 parts per billion by volume; ppbv) the monthly climatological O 3 mixing ratio in three clusters that contain 13–16% of profiles, mostly in winter and spring. Large midtropospheric deviations from monthly means (−6 ppbv, +7–10 ppbv O 3 at 6 km) are found in two of the most populated clusters (combined 36–39% of profiles). These two clusters contain distinctly polluted (summer) and clean O 3 (fall‐winter, high tropopause) profiles, respectively. As for tropical profiles previously analyzed with SOM, O 3 averages are often poor representations of U.S. O 3 profile statistics." @default.
• W2317491880 created "2016-06-24" @default.
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• W2317491880 date "2016-02-06" @default.
• W2317491880 modified "2023-10-18" @default.
• W2317491880 title "Tropospheric ozonesonde profiles at long‐term U.S. monitoring sites: 1. A climatology based on self‐organizing maps" @default.
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• W2317491880 doi "https://doi.org/10.1002/2015jd023641" @default.
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