Observational constraints on the chemistry of isoprene nitrates over the eastern United States

摘要: incompatible with the observations. We find that � 50% of isoprene nitrate production in model occurs via reactions (or its oxidation products) NO3 radical, but note yield from this pathway is highly uncertain. Using recent estimates rapid reaction rates ozone, 20–24% nitrates are lost pathway, implying ozonolysis an important loss process for nitrates. Isoprene shown to have a major impact on nitrogen oxide (NOx =N O +N O2) budget summertime U.S. continental boundary layer, consuming 15–19% emitted NOx, which 4–6% recycled back NOx and remainder exported as (2–3%) or deposited (8–10%). Our constraints rates, branching ratios, deposition need be confirmed through further laboratory field measurements. The systematically underestimates free tropospheric concentrations organic nitrates, indicating future investigation processes controlling observed distribution.