TRACE GAS MEASUREMENTS IN PHOENIX, ARIZONA (1998).

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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 of the downtown area, a site (Usery Pass) was set up for the detailed characterization of the mature Phoenix urban plume. Detailed measurements in the ... continued below

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6 pages

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NUNNERMACKER,L.J. January 9, 2000.

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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 of the downtown area, a site (Usery Pass) was set up for the detailed characterization of the mature Phoenix urban plume. Detailed measurements in the source region were made at several sites in downtown Phoenix. The DOE G-1 aircraft, equipped with a comprehensive array of instruments to characterize atmospheric trace gas and aerosol composition, flew over the region at various times during the day. All times in the following discussion are local standard time (LST). Morning flights were typically made between 08:00 and 12:00 upwind, to measure background concentrations, and over the Phoenix source region, to characterize the sources of ozone precursors. Afternoon flights over the Phoenix source region and downwind between 15:00 and 18:00 were made to examine the chemical properties and physical distribution of the photochemically aged urban plume. The aircraft flights typically included an atmospheric sounding to circa 3 km upwind and over Phoenix in the morning, and downwind in the afternoon. A total of 22 flights were made on 14 different days during the one month program. The motivation for conducting the program was to examine ozone formation rates and efficiencies in an environment where the pollutant mix is dominated by vehicle emissions, where the contribution of biogenic hydrocarbons to ozone formation is thought to be low, and where processing conditions are different than they are in the Eastern US. The latter includes significant differences in atmospheric humidity, solar intensity, and boundary layer heights. The objective of this paper is to describe general features of the chemical and meteorological data collected during the program and to present results from an aircraft case study when O{sub 3} concentrations were among the highest measured during the entire study.

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6 pages

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  • SYMPOSIUM ON ATMOSPHERIC CHEMISTRY ISSUES IN THE 21ST CENTURY, 80TH AMS ANNUAL MEETING, LONG BEACH, CA (US), 01/09/2000--01/14/2000

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  • Report No.: BNL--66838
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 750768
  • Archival Resource Key: ark:/67531/metadc702020

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  • January 9, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 10, 2015, 12:36 p.m.

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NUNNERMACKER,L.J. TRACE GAS MEASUREMENTS IN PHOENIX, ARIZONA (1998)., article, January 9, 2000; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc702020/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.