HR: 0830h
AN: A51D-0707    [PDF]
TI: Evaluating NOx/NOy Ratio as a method for Determining Long Range Vs. Short Range Pollution Events in New England.
AU: Talbot, R
EM: robert.talbot@unh.edu
AF: Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824 United States
AU: Mao, H
EM: hmao@typhoon.sr.unh.edu
AF: Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824 United States
AB: The NOx/NOy ratio has been used in past studies to determine the relative age of an air mass. Here we evaluate the use of this ratio with data collected from air quality monitoring sites operated by the Atmospheric Investigation, Regional Modeling, Analysis and Prediction (AIRMAP) program as a method for determining long versus short range pollution events in New England. Pollution events were identified using multiple gas phase species (O3, CO, NO, NOy) over a six-month period from July 2002 through December 2002. A total of 46 individual events were identified which lasted longer than 30 minuets at or above the 95% level of the selected species. The 95% level of CO, O3, NO and NOy for each species was 346 ppbv, 65 ppbv, 5.46 ppbv and 19.0 ppbv respectively. Backward trajectories and selected volatile organic compounds (VOC's) are being used to verify source regions. The frequency of short and long range pollution events using this method is being quantified and their seasonal variability assessed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution--urban and regional (0305)
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting