Seasonal measurements of OH, NO x , and J(O 1 D) at Mace Head, Ireland

J(O 1 D), exhibited strong linear correlations with slopes of 1.06 (0.05)10 11 cm 3 s (R=0.75) in clean marine air and 1.31 (0.04)10 11 cm 3 s (R=0.79) in mixed marine/ continental air. Surprisingly, no significant difference in the former correlation was found between low and high tide periods. NO and NO2 levels in air from the marine sector (190–300) were typically below the detection limit (30pptv and <200pptv, respectively). In the land sector, NO mixing ratios <50pptv dominated most of the time, suggesting that the atmospheric oxidation efficiency in this region is predominantly characterized by primary OH sources in a low NOx environment. Citation: Berresheim, H., J. McGrath, M. Adam, R. L. III Mauldin, B. Bohn, and F. Rohrer (2013), Seasonal measurements of OH, NOx, and J(O 1 D) at Mace Head, Ireland, Geophys. Res. Lett., 40 ,1 659–1663, doi:10.1002/grl.50345.