Abstract
The atmospheric mixing ratios of CCl2F2 (F‐12) and CCl3F (F‐11) increase abruptly up to 14 ppt (F‐12) and 8 ppt (F‐11) after strong cold fronts pass and decrease abruptly after warm fronts pass at a semi‐continuous monitoring station near Pullman, Washington (46°42′N, 117°10′W). We conclude that air masses from higher latitudes (>60°N) can have F‐12 and/or F‐11 concentrations as much as 5% higher than mid‐latitude air masses. Conversely, nitrous oxide shows no significant changes during frontal passages and is uniformly distributed between air masses.
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