HR: 15:10h
AN: A12D-07    [PDF]
TI: Measurements of HNO$_{3}$ and NO$_{y}$ on Cirrus Ice Particles and in Solution Aerosols During CRYSTAL-FACE
AU: * Weinheimer, A J
EM: wein@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305
AU: Knapp, D J
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305
AU: Montzka, D D
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305
AU: Ridley, B A
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305
AU: Popp, P J
AF: National Oceanic and Atmospheric Administration Aeronomy Laboratory; Univeristy of Colorado CIRES, 325 Broadway, Boulder, CO 80305
AU: Gao, R S
AF: National Oceanic and Atmospheric Administration Aeronomy Laboratory; Univeristy of Colorado CIRES, 325 Broadway, Boulder, CO 80305
AU: Marcy, T P
AF: National Oceanic and Atmospheric Administration Aeronomy Laboratory; Univeristy of Colorado CIRES, 325 Broadway, Boulder, CO 80305
AU: Fahey, D W
AF: National Oceanic and Atmospheric Administration Aeronomy Laboratory; Univeristy of Colorado CIRES, 325 Broadway, Boulder, CO 80305
AU: Baumgardner, D
AF: Universidad Nacional Autonoma de Mexico, Circuito Exterior, Mexico City, 04510
AU: Anderson, B E
AF: NASA, Langley Research Center, Hampton, VA 23681
AU: Wilson, J C
AF: University of Denver, 2390 S. York St., Denver, CO 80208
AU: Lee, S H
AF: University of Denver, 2390 S. York St., Denver, CO 80208
AU: Reeves, J M
AF: University of Denver, 2390 S. York St., Denver, CO 80208
AU: Lafleur, B G
AF: University of Denver, 2390 S. York St., Denver, CO 80208
AU: Hilbert, H
AF: University of Denver, 2390 S. York St., Denver, CO 80208
AU: Schmit, O
AF: University of Denver, 2390 S. York St., Denver, CO 80208
AU: Herman, R L
AF: Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109
AU: Weinstock, E M
AF: Harvard University, Atmospheric Research Program, Cambridge, MA 02138
AU: Smith, J B
AF: Harvard University, Atmospheric Research Program, Cambridge, MA 02138
AU: Sayres, D W
AF: Harvard University, Atmospheric Research Program, Cambridge, MA 02138
AU: Vellovic, J
AF: Harvard University, Atmospheric Research Program, Cambridge, MA 02138
AU: Anderson, J G
AF: Harvard University, Atmospheric Research Program, Cambridge, MA 02138
AU: Bui, T P
AF: NASA Ames Research Center, M.S. 245-5, Moffett Field, CA 94035
AU: Bowen, S W
AF: NASA Ames Research Center, M.S. 245-5, Moffett Field, CA 94035
AU: Pfister, L
AF: NASA Ames Research Center, M.S. 245-5, Moffett Field, CA 94035
AU: Dean-Day, J
AF: NASA Ames Research Center, M.S. 245-5, Moffett Field, CA 94035
AU: Chang, C
AF: NASA Ames Research Center, M.S. 245-5, Moffett Field, CA 94035
AB: NO$_{x}$ (NO + NO$_{2}$) is central to tropospheric O$_{3}$ production. The larger family of gases with which NO$_{x}$ interconverts, NO$_{y}$, or total reactive nitrogen, includes HNO$_{3}$. One potential mechanism for the removal and/or vertical transport of NO$_{y}$ is via uptake on ice particles and aerosols. NO$_{x}$ is unlikely to be subject to such uptake, and HNO$_{3}$ is likely the most significant NO$_{y}$ species subject to uptake. Thus the uptake of HNO$_{3}$ has the potential to affect indirectly the O$_{3}$ budget of the atmospehre [Lawrence and Crutzen, Tellus, 1998; Meier and Hendricks, JGR, 2002]. To assess the degree of uptake, condensed-phase HNO$_{3}$ and NO$_{y}$ were measured during CRYSTAL-FACE by instruments in adjacent pallets on the WB57. The instruments employed nearly identical inlets for the enhanced (anisokinetic) sampling of condensed-phase species. Each instrument employed a second inlet for the measurement of the gas-phase plus small-particle fraction. Differences in the small-particle sampling by these latter inlets has proven beneficial for the inference of condensed-phase HNO$_{3}$ on particles with diameters of order 1 micron. This talk will emphasize the southern survey flight of 9 July 2002, for which we infer the presence of condensed-phase HNO$_{3}$ in ternary solutions of H$_{2}$O, H$_{2}$SO$_{4}$, and HNO$_{3}$. Ice was found in greater and lesser amounts in the presence of the aerosols, but ice appears to have played little role in the uptake of HNO$_{3}$ here, as the aerosols compete very effectively for the HNO$_{3}$ in this particular case, due to the relatively large particle volume and the low temperatures. In addition, the condensed-phase NO$_{y}$ measurements are compared to the condensed-phase HNO$_{3}$ measurements described in another presentation at this meeting (Popp et al.) Overall the condensed-phase HNO$_{3}$ and NO$_{y}$ amounts are similar to one another and give no indication that other NO$_{y}$ species are taken up by cirrus ice particles.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting