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The Bermuda High (BH) quasi-permanent pressure system is the key large-scalecirculation pattern influencing summertime weather over the eastern andsouthern US. Here we developed a multiple linear regression (MLR) model tocharacterize the effect of the BH on year-to-year changes in monthly-meanmaximum daily 8 h average (MDA8) ozone in the Houston–Galveston–Brazoria(HGB) metropolitan region during June, July, and August (JJA). The BHindicators include the longitude of the BH western edge (BH-Lon) and the BHintensity index (BHI) defined as the pressure gradient along its westernedge. Both BH-Lon and BHI are selected by MLR as significant predictors(p < 0.05) of the interannual (1990–2015) variability of theHGB-mean ozone throughout JJA, while local-scale meridional wind speed isselected as an additional predictor for August only. Local-scale temperatureand zonal wind speed are not identified as important factors for any summermonth. The best-fit MLR model can explain 61–72 % of the interannualvariability of the HGB-mean summertime ozone over 1990–2015 and shows goodperformance in cross-validation (R2 higher than 0.48). The BH-Lon is themost important factor, which alone explains 38–48 % of such variability.The location and strength of the Bermuda High appears to control whether ornot low-ozone maritime air from the Gulf of Mexico can enter southeasternTexas and affect air quality. This mechanism also applies to other coastalurban regions along the Gulf Coast (e.g., New Orleans, LA, Mobile, AL, andPensacola, FL), suggesting that the BH circulation pattern can affect surfaceozone variability through a large portion of the Gulf Coast

Influence of the Bermuda High on interannual variability of summertime ozone in the Houston–Galveston–Brazoria region