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in creator/contributor: "NUNNERMACKER,L.J."  
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TRACE GAS MEASUREMENTS IN PHOENIX, ARIZONA (1998).

Description: The DOE Atmospheric Chemistry Program, and the Arizona Department of Environmental Quality (DEQ) conducted a field program in the Phoenix Metropolitan area in the late spring of 1998. The experiment was composed of a linked set of aircraft and surface measurements designed to characterize the chemical and meteorological processes leading to ozone episodes. The existing network of Arizona DEQ sites in Phoenix was utilized to document ground level concentrations of ozone and its precursors. West … more
Date: January 9, 2000
Creator: NUNNERMACKER,L.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trace gas measurements in Phoenix, Arizona (1998)

Description: The DOE Atmospheric Chemistry Program, and the Arizona Department of Environmentel Quality (DEQ) conducted a field program in the Phoenix Metropolitan area in the late spring of 1998. The experiment was composed of a linked set of aircraft and surface measurements designed to characterize the chemical and meteorological processes leading to ozone episodes. The existing network of Arizona DEQ sites in Phoenix was utilized to document ground level concentrations of ozone and its precursors. West … more
Date: January 9, 2000
Creator: Nunnermacker, L.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ozone Precursors, Source Regions, and O(3) Formation During the TEXAQS 2000 Study

Description: The DOE G-1 aircraft made flights on 14 days during the TexAQS 2000 study. On 7 of those days, the aircraft encountered highly localized plumes exhibiting O{sub 3} concentrations in excess of 150 ppb; on some days, peak O{sub 3} concentrations were in excess of 200 ppb. These ozone plumes were rapidly formed with an efficiency (O{sub 3} per NO{sub x} molecule consumed) much higher (7-20) than observed in other urban areas (3-4), and were frequently associated with high concentrations (>20 pp… more
Date: October 1, 2001
Creator: Daum, P. H.; Kleinman, L. I.; Brechtel, F.; Lee, Y. N.; Nunnermacker, L. J.; Springston, S. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Efficiency of Ozone Production in the Houston Plume

Description: Ozone levels observed during a field campaign in Houston were significantly higher than that observed in Phoenix or Philadelphia. An examination of the slope of O{sub x} versus NO{sub z} in the urban plumes shows that NO{sub x} is used 2 to 3 times more efficiently in Houston as compared with Phoenix and Philadelphia. Representative values of OPEx are 7-12, 3, and 4, in Houston, Phoenix, and Philadelphia. Aircraft observations have been used to calculate P(O{sub 3})/P(NO{sub z}). Values in Hous… more
Date: October 1, 2001
Creator: Kleinman, L. I.; Daum, P. H.; Brechtel, F.; Lee, Y. N.; Nunnermacker, L. J.; Springston, S. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Chemical Evolution of a Power-Plant Plume

Description: Measurements made from the DOE G-1 aircraft were used to calculate the rate and efficiency of O{sub 3} production downwind of an isolated, coal-fired power plant. The plume was transected 12 times at distances ranging to 65 km from its source (corresponding to an age of {approx}4 h assuming constant wind velocity). For NO{sub x}, a loss rate of 0.5 h{sup -1} was calculated. If reaction with OH was the sole loss mechanism, then an [OH] = 1.6 x 10{sup 7}molec/cm{sup 3} is inferred, which is {appr… more
Date: October 1, 2001
Creator: Springston, S. R.; Kleinman, L. I.; Brechtel, F.; Daum, P. H.; Lee, Y. N.; Nunnermacker, L. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

OZONE PRODUCTION IN THE PHILADELPHIA URBAN AREA DURING NE-OPS 99

Description: As part of the 1999 NARSTO Northeast Oxidant and Particulate Study (NE-OPS) field campaign, the DOE G-1 aircraft sampled trace gases and aerosols in and around the Philadelphia metropolitan area. Twenty research flights were conducted between July 25 and August 11. The overall goals of these flights were to obtain a mechanistic understanding of O{sub 3} production; to characterize the spatial and temporal behavior of photo-oxidants and aerosols; and to study the evolution of aerosol size distri… more
Date: October 1, 2001
Creator: Kleinman, L. I.; Daum, P. H.; Brechtel, F.; Lee, Y. N.; Nunnermacker, L. J.; Springston, S. R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of Hydroperoxides During the Texas 2000 Air Quality Study

Description: Hydroperoxides are important atmospheric oxidants. They are responsible for most of the oxidation of aqueous-phase SO{sub 2} to sulfate in the northeastern United States, resulting in the formation of acid precipitation and visibility-reducing sulfate aerosol (Penkett et al., 1979; Lind et al., 1987; Madronich and Calvert, 1990; Tanner and Schorran, 1995). Atmospheric hydrogen peroxide (H{sub 2}O{sub 2} or HP) is produced by the self-reaction of hydroperoxyl radicals (HO{sub 2}); higher organic… more
Date: January 17, 2002
Creator: Zheng, J.; Alaouie, A.; Weinstein-Lloyd, J. B.; Springston, S. R.; Nunnermacker, L. J.; Lee, Y. N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of Hydroperoxides During the Texas 2000 Air Quality Study

Description: Hydroperoxides are important atmospheric oxidants. They are responsible for most of the oxidation of aqueous-phase SO{sub 2} to sulfate in the northeastern United States, resulting in the formation of acid precipitation and visibility-reducing sulfate aerosol (Penkett et al., 1979; Lind et al., 1987; Madronich and Calvert, 1990; Tanner and Schorran, 1995). Atmospheric hydrogen peroxide (H{sub 2}O{sub 2} or HP) is produced by the self-reaction of hydroperoxyl radicals (HO{sub 2}); higher organic… more
Date: January 17, 2002
Creator: Zheng, J.; Alaouie, A.; Weinstein-Lloyd, J. B.; Springston, S. R.; Nunnermacker, L. J.; Lee, Y. N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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