Abstract
Results are presented for measurements of the concentration of OH performed aboard the NASA P3‐B aircraft using the Selected Ion Chemical Ionization Mass Spectrometry technique during the Pacific Exploratory Mission‐Tropics (PEM) study. Typical midday boundary layer OH concentrations of 6–8 × 106 molecules cm−3 were observed. Diurnally averaged boundary layer OH values obtained near Christmas Island, Kiribati, combined with SO2 and filter measurements of non‐sea‐salt sulfate reveal that only 12% of the sulfate found in the particulate form can be attributed to gas phase H2SO4 production/condensation. Measurements performed over clouds yielded [OH] 2–3 times larger than those typically observed under similar cloudless conditions.
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