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Tri chlorofluoro methane as a tracer of urban air masses

, : Tri chlorofluoro methane as a tracer of urban air masses. Atmospheric Environment 15(9): 1653-1658

CCl3F measurements in 34 air samples collected at remote Whiteface Mountain, New York, USA, (elevation 1.5 km) during Sept. 26-Oct. 29, 1978, using electron capture gas chromatography were described. The day-to-day CCl3F concentration varied between values of 163-121 ppt [parts/trillion] (10-12, vol/vol) with an average concentration of 137 ppt. Simultaneous measurements of O3 and 7Be along with relevant meteorological parameters were also presented. The O3-CCl3F concentration interrelation suggested that CCl3F could be used as an area source urban tracer. Periods of elevated O3 levels associated with high 7Be concentration concomitantly marked by low CCl3F concentrations were explained qualitatively in terms of intrusion of upper atmospheric/stratospheric air into the lower tropospheric air masses. The contribution of this factor was significant and must be taken into account while establishing the role of CCl3F as a tracer through its measurements in the lower troposphere.

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