HR: 1340h
AN: A53C-0920    [Abstracts]
TI: PTR-MS Measurements of Atmospheric VOCs during the ICARTT 2004 Campaign
AU: * Nielsen, L
EM: lnielsen@cisunix.unh.edu
AF: University of New Hampshire, Climate Change Research Center, Durham, NH 03824 United States
AU: Sive, B C
EM: bcs@gust.sr.unh.edu
AF: University of New Hampshire, Climate Change Research Center, Durham, NH 03824 United States
AU: Talbot, R W
EM: robert.talbot@unh.edu
AF: University of New Hampshire, Climate Change Research Center, Durham, NH 03824 United States
AB: Two proton transfer reaction mass spectrometers (PTR-MS, Ionicon Analytik) were employed for atmospheric measurements of volatile organic compounds (VOCs) during the ICARTT 2004 summer campaign. One PTR-MS was located at UNH's Thompson Farm Observing Station (latitude 43.11, longitude -70.95) and a higher sensitivity instrument (PTR-MS-hs) was located at Appledore Island (latitude 42.99, longitude -69.34). Both instruments were run under the same conditions with a drift tube pressure of 2 mbar with an electric field of 600 V and a 20 second dwell time for measuring 23 VOCs, yielding a cycle time of approximately 10 minutes. Intercomparisons between the PTR-MS's and other VOC measurements conducted on Appledore Island and Thompson Farm during the summer campaign are in good agreement overall. Other measurements that were deployed on the island included mist chamber/ion chromatography measurements for acetic acid, canister samples analyzed by GC-ECD/FID/MS and an in situ, cryo-less GC system for NMHCs and OVOCs. Trace gas distributions will be presented in addition to the local and regional impact on ozone production in New England from reactive VOC enhancements.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0315 Biosphere/atmosphere interactions
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting