Abstract
Reliably measuring hydroxyl radical in the lower atmosphere, which has been possible for only about 10 years, has required unwieldy instruments that shoot laser beams across many miles of terrain. Now, German researchers report they have been able to make accurate measurements of the fleeting scavenger species with two instruments that are much more compact. We have performed the first successful intercomparison of two local in situ OH techniques/7 atmospheric scientist Hans-Peter Dorn tells C&EN. It was exciting to see the extremely good and absolute correspondence of both measurements, even under conditions where the OH concentration was changing very fast during the day. Dorn and his coworkers at the Institute for Atmospheric Chemistry, Research Center KFA, in Jiilich, Germany, made their measurements in rural northeast Germany in August 1994. They report their results in three papers in the Sept. 1 issue of Geophysical Research Letters [23, 2537, 2541, and 2545 (1996)]. Hydroxyl is the most ...
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