OH vertical column abundance: Tropical measurements

Abstract
Measurements of the vertical column abundance of atmospheric hydroxyl (OH) have been made during the period 1987–1989 at the National Weather Service (NWS) station at Moen, Truk, Federated States of Micronesia (7°N, 152°E). A total of 384 independent data sets was obtained. Tropical OH abundance levels average about 22% above corresponding mid‐latitude values, with OH levels during late winter and early spring up to 50% above those observed at 40°N. Stratospheric wind and temperature data obtained from the daily NWS radiosonde data are examined for correlations with the OH results.