HR: 1340h
AN: A53C-0917    [Abstracts]
TI: Atmospheric Determination of NO, NO$_{2}$, NO$_{y}$, and PAN in Rural Canadian Environments Using an Automated Measurement System
AU: * O'Brien, J M
EM: jason.o'brien@ec.gc.ca
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AU: MacTavish, D
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AU: Bottenheim, J W
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AU: Gallant, A
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AU: Kobelka, W
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AU: Shaw, M
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AU: Zhang, L
AF: Environment Canada/ Meteorological Service of Canada, 4905 Dufferin St., Toronto, ON M3H 5T4 Canada
AB: As part of the Canadian Air and Precipitation Monitoring Network (CAPMoN) measurements of NO, NO$_{2}$, NO$_{y}$, and Peroxyacetic nitric anhydride (PAN) were made to characterize the ambient concentrations of different nitrogen compounds in order to estimate their contributions to the total nitrogen dry deposition flux at regional-scale sites in Canada. Fully automated systems, complete with calibration routines and remote data acquisition have been operating at two rural locations since August 2002. These measurement sites are located in Kejimkujik National Park, Nova Scotia and at the Centre for Atmospheric Research Experiments (CARE) located in Egbert, Ontario (approx. 80 km north of Toronto). Continuous measurements of NO, NO$_{2}$, and NO$_{y}$ were made using a Thermo Environmental Instruments trace level chemiluminescence-based analyzer with the conversion of NO$_{2}$ and NO$_{y}$ to NO by photolysis and molybdenum converters respectively. PAN measurements were made every five minutes by direct injection into a designed gas chromatograph equipped with a pulse discharge detector (GC-PDD) and calibrated several times daily using photochemically generated PAN standards. Detection limits for all these measurements were found to be on the order of 50 parts per trillion (ppt). Details of the measurement system, the challenges of validating low level measurements, and preliminary findings related to the similarities and differences found at these sites will be discussed.
DE: 9350 North America
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting