TRACE GAS AND AEROSOL MEASUREMENTS AT A REMOTE SITE IN THE NORTHEAST U.S.

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Abstract

This paper presents the results of continuous measurements of trace atmospheric gases and aerosol composition made at the summit of Whiteface Mountain, New York, for 28 days in July 1982. The gas phase species NO, NOx (= NO + NO2 + PAN), HNO3, SO2 and NH3 were measured, as well as aerosol SO2−4, NO3, H+ and NH+4. Mean and median NOx concentrations were 1.1 and 1.0 ppb, respectively, with maximum and minimum values of 3.2 and 0.3 ppb. HNO3 concentrations were variable, occasionally exceeding the simultaneously measured NOx levels. Mean and median SO2 were 0.8 and 0.3 ppb, with concentrations up to 12 ppb in pollution episodes. Mean and median NH3 were both 2.2 ppb. Monthly mean so2−4 was 5.3 μgm−3, with values in clean air of about 1.5 μgm−3, and in polluted air up to 80 μgm−3. Trajectory calculations indicate that episodes of high pollutant concentrations occur in air masses arriving at Whiteface from the southwest. These episodes contributed most of the SO2−4, HNO3 and aerosol acidity, and about half the SO2 and NOx, to which the site was exposed during the measurement period. Limited comparisons of air chemistry data with the composition of cloudwater collected during the program are also presented.

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