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@ARTICLE{Neumann:22398,
author = {Neumann, J.A. and Trainer, M. and Aikin, K.C. and Angevine,
W.M. and Brioude, J. and Brown, S.S. and de Gouw, J.A. and
Dube, W.P. and Flynn, J.H. and Graus, M. and Holloway, J.S.
and Lefer, B.L. and Nedelec, P. and Nowak, J.B. and Parrish,
D.D. and Pollack, I.B. and Roberts, J.M. and Ryerson, T.B.
and Smit, H. and Thouret, V. and Wagner, N.L.},
title = {{O}bservations of ozone transport from the free troposphere
to the {L}os {A}ngeles basin},
journal = {Journal of Geophysical Research},
volume = {117},
issn = {0148-0227},
address = {Washington, DC},
publisher = {Union},
reportid = {PreJuSER-22398},
pages = {1 - 15},
year = {2012},
note = {Record converted from VDB: 12.11.2012},
abstract = {Analysis 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.},
keywords = {J (WoSType)},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {Atmosphäre und Klima},
pid = {G:(DE-Juel1)FUEK491},
shelfmark = {Meteorology $\&$ Atmospheric Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000301498500006},
doi = {10.1029/2011JD016919},
url = {https://juser.fz-juelich.de/record/22398},
}