Measurements of peroxides and related species during the 1995 summer intensive of the Southern Oxidants Study in Nashville, Tennessee

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Bibliographische Detailangaben
Zeitschriftentitel:	Journal of Geophysical Research: Atmospheres
Personen und Körperschaften:	Weinstein‐Lloyd, J. B., Lee, J. H., Daum, P. H., Kleinman, L. I., Nunnermacker, L. J., Springston, S. R., Newman, L.
In:	Journal of Geophysical Research: Atmospheres, 103, 1998, D17, S. 22361-22373
Format:	E-Article
Sprache:	Englisch
veröffentlicht:	American Geophysical Union (AGU)
Schlagwörter:	Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics

Details
Zusammenfassung:	<jats:p>Hydroperoxide measurements are presented for 12 flights of the U.S. Department of Energy G‐1 aircraft during the summer 1995 intensive of the Southern Oxidants/Middle Tennessee study. A three‐channel analyzer, utilizing both peroxidase/<jats:italic>p</jats:italic>‐hydroxy phenylacetic acid (<jats:italic>p</jats:italic>OHPAA) and ferrous sulfate/benzoic acid (FeBA) reagents permitted continuous measurements of hydrogen peroxide (H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>), methyl hydroperoxide (CH<jats:sub>3</jats:sub>OOH or MHP), and hydroxymethyl hydroperoxide (HOCH<jats:sub>2</jats:sub>OOH or HMHP). The median concentration of total hydroperoxide was 5.2 ppbv, with median concentrations of 2.4, 1.7, and 0.97 ppbv for H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>, MHP, and HMHP respectively. In the free troposphere, H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> concentration correlated with the concentration of its precursors, ozone, and water vapor. H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> profiles do not show elevated concentrations in the boundary layer, in contrast to vertical profiles of primary pollutants. The combination of high NO<jats:sub><jats:italic>x</jats:italic></jats:sub> concentrations that inhibited peroxide formation, and peroxide loss through deposition and reaction with OH, led to markedly lower peroxide concentrations within urban and power plant plumes. Photochemical calculations performed to estimate the magnitude of in‐plume peroxide depression showed reasonable agreement with observations.</jats:p>
Umfang:	22361-22373
ISSN:	0148-0227
DOI:	10.1029/98jd01636