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000022398 1001_ $$0P:(DE-HGF)0$$aNeumann, J.A.$$b0
000022398 245__ $$aObservations of ozone transport from the free troposphere to the Los Angeles basin
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000022398 440_0 $$06393$$aJournal of Geophysical Research D: Atmospheres$$v117$$x0148-0227$$yD00V09
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000022398 520__ $$aAnalysis of in situ airborne measurements from the CalNex 2010 field experiment (Research at the Nexus of Air Quality and Climate Change) show that ozone in the boundary layer over Southern California was increased by downward mixing of air from the free troposphere (FT). The chemical composition, origin, and transport of air upwind and over Los Angeles, California, were studied using measurements of carbon monoxide (CO), ozone, reactive nitrogen species, and meteorological parameters from the National Oceanic and Atmospheric Administration WP-3D aircraft on 18 research flights in California in May and June 2010. On six flights, multiple vertical profiles from 0.2-3.5 km above ground level were conducted throughout the Los Angeles (LA) basin and over the Pacific Ocean. Gas phase compounds measured in 32 vertical profiles are used to characterize air masses in the FT over the LA basin, with the aim of determining the source of increased ozone observed above the planetary boundary layer (PBL). Four primary air mass influences were observed regularly in the FT between approximately 1 and 3.5 km altitude: upper tropospheric air, long-range transport of emissions, aged regional emissions, and marine air. The first three air mass types accounted for 89% of the FT observations. Ozone averaged 71 ppbv in air influenced by the upper troposphere, 69 ppbv in air containing emissions transported long distances, and 65 ppbv in air with aged regional emissions. Correlations between ozone and CO, and ozone and nitric acid, demonstrate entrainment of ozone from the FT into the LA PBL. Downward transport of ozone-rich air from the FT into the PBL contributes to the ozone burden at the surface in this region and makes compliance with air quality standards challenging.
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000022398 7001_ $$0P:(DE-HGF)0$$aAngevine, W.M.$$b3
000022398 7001_ $$0P:(DE-HGF)0$$aBrioude, J.$$b4
000022398 7001_ $$0P:(DE-HGF)0$$aBrown, S.S.$$b5
000022398 7001_ $$0P:(DE-HGF)0$$ade Gouw, J.A.$$b6
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000022398 7001_ $$0P:(DE-HGF)0$$aFlynn, J.H.$$b8
000022398 7001_ $$0P:(DE-HGF)0$$aGraus, M.$$b9
000022398 7001_ $$0P:(DE-HGF)0$$aHolloway, J.S.$$b10
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000022398 7001_ $$0P:(DE-HGF)0$$aNowak, J.B.$$b13
000022398 7001_ $$0P:(DE-HGF)0$$aParrish, D.D.$$b14
000022398 7001_ $$0P:(DE-HGF)0$$aPollack, I.B.$$b15
000022398 7001_ $$0P:(DE-HGF)0$$aRoberts, J.M.$$b16
000022398 7001_ $$0P:(DE-HGF)0$$aRyerson, T.B.$$b17
000022398 7001_ $$0P:(DE-Juel1)16203$$aSmit, H.$$b18$$uFZJ
000022398 7001_ $$0P:(DE-HGF)0$$aThouret, V.$$b19
000022398 7001_ $$0P:(DE-HGF)0$$aWagner, N.L.$$b20
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