HR: 1340h
AN: A43C-0082    [Abstracts]
TI: Measurements of N$_{2}$O$_{5}$, NO$_{2}$ and O$_{3}$ at a Site in the San Francisco Bay Area
AU: * Wood, E C
EM: ezrawood@yahoo.com
AF: Department of Chemistry, University of California, Berkeley, Department of Chemistry, c/o Cohen Group University of California, Berkeley, CA 94720
AU: Wooldridge, P J
EM: pjwool@socrates.Berkeley.EDU
AF: Department of Chemistry, University of California, Berkeley, Department of Chemistry, c/o Cohen Group University of California, Berkeley, CA 94720
AU: Minejima, C
EM: minejima@berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, Department of Chemistry, c/o Cohen Group University of California, Berkeley, CA 94720
AU: Bertram, T H
EM: tbertram@berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, Department of Chemistry, c/o Cohen Group University of California, Berkeley, CA 94720
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Department of Chemistry, University of California, Berkeley, Department of Chemistry, c/o Cohen Group University of California, Berkeley, CA 94720
AB: We present measurements of N$_{2}$O$_{5}$, NO$_{2}$ and O$_{3}$ made during January 2004. N$_{2}$O$_{5}$ was measured by thermal dissociation to yield NO$_{3}$, which was then detected by laser-induced fluorescence (LIF). NO$_{2}$ was also measured by LIF, and O$_{3}$ was measured using a commercial uv photometric analyzer. The site is a forest research reservation adjacent to Briones Regional Park in the coastal hills of Contra Costa County, 30 km northeast of San Francisco. Mixing ratios of N$_{2}$O$_{5}$ ranged up to 200 ppt at night, with calculated steady state lifetimes of 5 to 30 minutes. Implied HNO$_{3}$ production rates by heterogeneous N$_{2}$O$_{5}$ hydrolysis as well as ongoing improvements to the N$_{2}$O$_{5}$ instrument will be discussed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting