HR: 09:32h
AN: A31E-07    [Abstracts]
TI: Observations of nitric acid removal that strongly affects the relationship between ozone and NOx oxidation products
AU: * Neuman, J
EM: andy.neuman@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Coloado, Boulder, CO 80309, United States
AU: * Neuman, J
EM: andy.neuman@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Nowak, J B
EM: john.nowak@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Coloado, Boulder, CO 80309, United States
AU: Nowak, J B
EM: john.nowak@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Zheng, W
EM: wengang@ucar.edu
AF: Cooperative Institute for Research in Environmental Sciences, University of Coloado, Boulder, CO 80309, United States
AU: Zheng, W
EM: wengang@ucar.edu
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Zheng, W
EM: wengang@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, P. O. Box 3000, Boulder, CO 80305-3000, United States
AU: Flocke, F
EM: ffl@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, P. O. Box 3000, Boulder, CO 80305-3000, United States
AU: Ryerson, T
EM: thomas.b.ryerson@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Trainer, M
EM: michael.k.trainer@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Holloway, J
EM: john.s.holloway@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Coloado, Boulder, CO 80309, United States
AU: Holloway, J
EM: john.s.holloway@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Parrish, D
EM: david.d.parrish@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AU: Fehsenfeld, F
EM: fred.c.fehsenfeld@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Coloado, Boulder, CO 80309, United States
AU: Fehsenfeld, F
EM: fred.c.fehsenfeld@noaa.gov
AF: NOAA Earth System Research Lab, 325 Broadway, R/CSD 7, Boulder, CO 80305, United States
AB: Over the past 20 years, the relationship between ozone formation and NOx precursors has been examined in order to understand the factors that control ozone pollution. Understanding the fate of NOx and its oxidation products is necessary to accurately determine the dependence of ozone upon NOx. Measurements of ozone, NOx, and NOx oxidation products were obtained from the NOAA WP-3 aircraft during the 2006 Texas Air Quality Study under a variety of meteorological conditions in plumes downwind from Houston, Texas. Over 50 crosswind transects of coalesced plumes from the Houston urban and industrial areas were examined. Nitric acid, which is one of the primary NOx oxidation products, can be removed rapidly from the atmosphere by deposition. This deposition affects reactive nitrogen partitioning and causes an increase in the slope of the correlation between ozone and the products of NOx oxidation (often interpreted as ozone production efficiency). During this study, nitric acid loss increased when wind speeds were high, causing the ozone to NOy-NOx correlation slopes to increase dramatically. Accounting for this loss is necessary to use correlation slopes of ozone versus NOy-NOx to represent an ozone production efficiency that describes the NOx-VOC chemistry.
DE: 3307 Boundary layer processes
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting