D. Tan et al., IN-SITU MEASUREMENTS OF HOX IN AIRCRAFT EXHAUST PLUMES AND CONTRAILS DURING SUCCESS, Geophysical research letters, 25(10), 1998, pp. 1721-1724
In situ flight measurements of the hydroxyl (OH) and hydroperoxyl (HO2
) radicals were performed in the exhaust plume of a Boeing 757 and in
the contrail. of a Douglas DC-8 flying under typical cruise conditions
in the upper troposphere and lower stratosphere during the SUCCESS mi
ssion of April and May 1996. Measurements were made in a range of exha
ust plume ages from roughly 10 seconds to 20 minutes. OH mixing ratios
were found to be greatly enhanced in the plumes, to 2-5 pptv from a b
ackground of 0.3-0.5 pptv in young plumes, and to 0.6 pptv from a back
ground of less than or equal to 0.2pptv in older contrails. HO2 mixing
ratios were heavily suppressed in the plumes, to 2-4 pptv from a back
ground of 10-20 pptv, for both young plumes and older contrails.