Aviation and the Global Atmosphere

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Figure 2-6: (a) Median NOx mixing ratios measured between 9 and 12 km during a number of in situ aircraft campaigns (compiled in Emmons et al., 1997); (b) NOx concentration field in the altitude regions between 300 and 190 hPa obtained by the measurements of NOxAR. As an example, the results for summer are shown. The aircraft carrying the NOxAR instruments operated from Z�rich to destinations in the USA and the far East (Beijing and Bombay-Hong Kong) from spring 1995 to spring 1996.

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