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- W1992027337 abstract "Hydrogen peroxide and methylhydroperoxide were measured in the troposphere over the western North Pacific as part of the airborne portion of NASA's Global Tropospheric Experiment/Pacific Exploratory Mission‐West A field mission. The flights circled the North Pacific, focusing on the western Pacific, and extended from 300 to 13,000 m altitude. The hydroperoxides were uniquely separated and quantified using a high‐pressure liquid chromatography system in conjunction with a continuous enzyme fluorometric instrument. Results show a latitudinal gradient in both peroxides at all altitudes; for example, between 3 and 5 km, H 2 O 2 median values decrease from 1700 to 500 parts per trillion by volume (pptv) in going from 0°–15°N to 45°–60°N, and the corresponding decrease in CH 3 OOH was 1100 to 200 pptv. Concentration maxima are observed in both species at altitudes of 2 to 3 km with H 2 O 2 concentrations below 1 km lower by 30%, 10% for CH 3 OOH, and even lower, by a factor of 10, for both above 9 km. The H 2 O 2 to CH 3 OOH ratio increased with altitude and latitude with ratios <1 in the tropical surface layer and >2 at midlatitude high altitude. Highest peroxide concentrations were encountered over the Celebes Sea in air which was impacted by aged biomass fire and urban pollutants. CH 3 OOH was below the level of detection in stratospheric air. H 2 O 2 exceeded SO 2 95% of the time, with the exceptions generally above 9 km. Above 3 km, O 3 increases with decreasing H 2 O 2 and CH 3 OOH. Below 3 km the O 3 ‐CH 3 OOH trend is the same but O 3 increases with increasing H 2 O 2 . The measurements are compared with predictions based upon a photochemical steady state zero‐dimensional model and a three‐dimensional mesoscale time‐dependent model. These models capture observed trends in H 2 O 2 and CH 3 OOH, with the possible exception of H 2 O 2 below 2 km where surface removal is important. A surface removal lifetime of 3.5 days brings the observed and zero‐dimensional model‐estimated H 2 O 2 into agreement. The steady state model suggests a strong correlation between the ratios of NO/CO or HO 2 /HO and the ratio of H 2 O 2 /CH 3 OOH. The observed hydroperoxide ratios bracket the modeled relationship with occasionally much lower H 2 O 2 than expected." @default.
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- W1992027337 date "1996-01-01" @default.
- W1992027337 modified "2023-09-27" @default.
- W1992027337 title "Hydrogen peroxide and methylhydroperoxide distributions related to ozone and odd hydrogen over the North Pacific in the fall of 1991" @default.
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- W1992027337 doi "https://doi.org/10.1029/95jd01364" @default.
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