HR: 1340h
AN: A33D-1531    [Abstracts]
TI: Nocturnal Vertical Profiles of Nitrogen Oxides, Ozone, Aerosol and VOC From the NOAA P-3 During TexAQS 2006
AU: * Dube', W
EM: william.p.dube@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Brown, S S
EM: steven.s.brown@nooa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Ryerson, T B
EM: thomas.b.ryerson@nooa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Warneke, C
EM: carsten.warneke@nooa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: de Gouw, J
EM: joost.degouw@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Atlas, E
EM: eatlas@rsmas.miami.edu
AF: University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149,
AU: Gallar, C
EM: carlos.gallar@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Wollny, A G
EM: adam.b.wollny@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Brock, C A
EM: charles.a.brock@noaa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Bahreini, R
EM: roya.bahreini@noaa.gov
AF: Cooperative Institute for Research in the Environmental Sciences, Univ. of Colorado, 216 UCB, Boulder, CO 80309, United States
AU: Middlebrook, A M
EM: ann.m.middlebrook@noaa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Holloway, J S
EM: John.S.Holloway@noaa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Trainer, M K
EM: michael.k.trainer@noaa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Fehsenfeld, F C
EM: fred.c.fehsenfeld@noaa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Meagher, J F
EM: james.f.meagher@noaa.gov
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AU: Ravishankara, A R
EM: a.r.ravishankra
AF: Earth System Sciences Laboratory, NOAA, 325 Broadway, Boulder, CO 80305, United States
AB: Vertical stratification and reduced mixing in the lower troposphere at night has implications for chemical transformations of ozone, nitrogen oxides, VOC and aerosol. Consequently, vertical profiling from the NOAA P-3 aircraft was an important focus of the nighttime flights during the TexAQS 2006 campaign in Houston, Texas. Profiles obtained from ascents and descents upon takeoff, landing and missed approaches to airfields penetrated the shallow nocturnal boundary layer and showed sharp contrasts between this layer and the residual daytime boundary layer above it. Discrete, shallow plumes with a depth less than 100 m were observed within the residual layer. Analysis of lifetimes of NO₃ and N₂O₅ and partitioning between these compounds and NO2 indicated that chemistry adjacent plumes within the residual layer differed substantially in terms of loss rates for NO₃ or N₂O₅. Profiles extending to higher altitude showed that NO₃ and N₂O₅ much longer lived in the free troposphere above the residual daytime boundary. This contribution examines nocturnal transport and chemical transformation within each of these layers - the nocturnal boundary layer, residual layer and free troposphere.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting