8.4

Measurements of Reactive Nitrogen Compounds (NO, NOX, NOY) During SHARP

Winston T. Luke, NOAA/ARL, Silver Spring, MD; and P. Kelley, B. L. Lefer, and J. H. Flynn

Concentrations of reactive nitrogen species were measured atop the Moody Tower at the University of Houston from April 15-May 31, 2009 as part of the Study of Houston Atmospheric Radicals Program (SHARP). A research-grade three channel instrument simultaneously measured concentrations of NO, NO_X (NO_X = NO + NO₂), and NO_Y (NO_Y = NO_X + HNO₃ + PAN + HONO + HO₂NO₂ + NO₃ + 2*N₂O₅+ p-NO₃^- + ....) at parts per trillion sensitivity and 1 second time resolution. NO₂ was selectively photolyzed to NO using a solid state light source. Heated molybdenum screen (375°C) was used to reduce NO_Y species to NO. Results will be compared with results from the 2006 TEXAQS-II study, and will be discussed in the context of emission source regions, diurnal variations, and correlations with other primary and secondary trace species.

Session 8, The Study of Houston Atmospheric Radical Precursors (SHARP) - III
Thursday, 21 January 2010, 1:30 PM-3:00 PM, B315

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