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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

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Stratospheric hydroperoxyl measurements.

W A Traub, D G Johnson, K V Chance

Science (New York, N.Y.)

|January 26, 1990

Summary

New measurements show hydroperoxyl radical (HO(2)) concentrations in the stratosphere align with theory up to 40 km. Above this altitude, HO(2) levels exceed predictions, possibly due to ozone underestimation.

Area of Science:

Atmospheric Chemistry
Stratospheric Science
Chemical Kinetics

Background:

The hydroperoxyl radical (HO(2)) is crucial for stratospheric ozone destruction via the HOx catalytic cycle.
Previous measurements of stratospheric HO(2) have yielded conflicting results, with some exceeding theoretical predictions.

Purpose of the Study:

To accurately measure stratospheric hydroperoxyl radical (HO(2)) profiles.
To compare experimental HO(2) data with theoretical models.

Main Methods:

Utilized a balloon-borne far-infrared spectrometer for HO(2) measurements.
Profile measurements were conducted during daytime and nighttime conditions.

Main Results:

Daytime HO(2) profiles closely matched theoretical predictions up to 40 km altitude.

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Above 40 km, measured HO(2) mixing ratios were approximately 30% higher than theoretical predictions.

Nighttime HO(2) profiles were significantly lower than daytime profiles, consistent with theoretical expectations.

Conclusions:

The study provides new, reliable data on stratospheric HO(2) concentrations.
Discrepancies above 40 km suggest potential underprediction of ozone concentrations in current atmospheric models.
The findings contribute to a better understanding of ozone depletion mechanisms in the stratosphere.