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• W1967722813 abstract "The origin of NO{sub x} in the summertime troposphere over subarctic eastern Canada is investigated by photochemical modeling of aircraft and ground-based measurements from the Arctic Boundary Layer Expedition (ABLE 3B). It is found that decomposition of peroxyacetyl nitrate (PAN) can account for most of the NO{sub x} observed between the surface and 6.2 km altitude (aircraft ceiling). Forest fires represent the principal source of PAN in the region, implying the same origin for NO{sub x}. There is, however, evidence for an unidentified source of NO{sub x} in occasional air masses subsiding from the upper troposphere. Isoprene emissions from boreal forests maintain high NO{sub x} concentrations in the continental boundary layer over eastern Canada by scavenging OH and NO{sub 3}, thus slowing down conversion of NO{sub x} to HNO{sub 3}, both in the daytime and at night. This effect is partly compensated by the production of CH{sub 3}CO{sub 3} radicals during isoprene oxidation, which slows down the decomposition of PAN subsiding from the free troposphere. The peroxy radical concentrations estimated from concurrent measurements of NO and NO{sub 2} concentrations during ABLE 3B are consistent with values computed from our photochemical model below 4 km, but model values are low atmore » higher altitudes. The discrepancy may reflect either a missing radical source in the model or interferences in the NO{sub 2} measurement. 63 refs., 10 figs., 1 tab.« less" @default.
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• W1967722813 date "1994-01-01" @default.
• W1967722813 modified "2023-09-24" @default.
• W1967722813 title "Origin of tropospheric NO_<i>x</i>over subarctic eastern Canada in summer" @default.
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• W1967722813 doi "https://doi.org/10.1029/94jd01122" @default.
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