Solar 11-Year Cycle Signal in Stratospheric Nitrogen Dioxide—Similarities and Discrepancies Between Model and NDACC Observations

摘要: NOx (NO2 and NO) plays an important role in controlling stratospheric ozone. Understanding the change its global pattern is for predicting future changes ozone corresponding implications on climate. Stratospheric mainly produced by reaction of N2O with photochemically O(1D) and, therefore, it expected to vary solar UV irradiance during cycle. Previous studies this topic, often limited relatively short continuous data, show puzzling results. The effect 1991 Pinatubo eruption might have caused interference data analysis. In study, we examine NO2 vertical column density (VCD) from Network Detection Atmospheric Composition Change (NDACC). Data collected at 16 stations long-term observations covering most recent Solar Cycles 23 24 were analyzed. We found positive correlations between VCD Lyman- $\alpha $ over nine (mostly Northern Hemisphere) negative three Southern Hemisphere). other four do not significant solar-cycle signal. varying responses one location another are likely due different geo-locations (latitude altitude). particular, two high-altitude strongest signals. Our 1D chemical-transport model calculations help explain altitude dependence response variability suggested play O3 range $\approx20~\mbox{km}$ near 60 km, while OH controls 40 – 90 km. While both forcing, predicts throughout middle atmosphere. 3D results suggest complex roles dynamics addition photochemistry. energetic particle-induced variabilities could also contribute significantly cycles.