HR: 1400h
AN: A23A-14    [Abstracts]
TI: Measurement of Ammonia Species in Both Urban and Rural Environments
AU: Hou, J
EM: jianhou@wadsworth.org
AF: School of Public Health, SUNY at Albany, Empire State Plaza, Albany, NY 12201, United States
AU: * Zhou, X
EM: zhoux@wadsworth.org
AF: School of Public Health, SUNY at Albany, Empire State Plaza, Albany, NY 12201, United States
AU: * Zhou, X
EM: zhoux@wadsworth.org
AF: Wadsworth Center, Empire State Plaza, Albany, NY 12201, United States
AB: Ammonia plays an important role in atmospheric aerosol formations. The information of gas-phase ammonia (NH3) and particulate ammonium (NH4+) is essential in our understanding of atmospheric particle formation dynamics. Here we present ambient NH3 and NH4+ measurement results in two field campaigns, one at a rural site in Pinnacle State Park in Addison, NY, in the summer of 2004, and the other at a urban site in Downtown Albany, NY, in the summer of 2005. Air sample was collected by wet scrubbing, derivatized via Berthelot's reaction and quantified by a long path absorption photometer. At the rural site, NH3 mixing ratios were in the range of 0.1 - 5.3 ppbv with a median of 0.48 ppbv and a mean of 0.57 ppbv. The NH4+ concentrations in aerosol phase were in the range of 0.03 - 6.6 ppbv with a median of 0.81 ppbv and a mean of 1.3 ppbv. The aerosol NH4+ was the dominant NHx species most of the time. In Downtown Albany, NH3 mixing ratios were in the range of 0.1 -1 0.9 ppbv with a median of 1.6 ppbv and a mean of 1.6 ppbv. The NH4+ concentrations in aerosol phase were in the range of 0.03 - 9.38 ppbv with a median of 1.5 ppbv and a mean of 2.0 ppbv. The average NH3 and NH4+ mixing ratios were comparable, but their ratio was highly dependent on local source emissions and correlated with meteorological conditions. Factors controlling the NHx distribution will be discussed.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly