Aviation and the Global Atmosphere

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Figure 3-18: Change in cirrus occurrence frequency between 1987-1991 and 1982-1986 (in %) computed from surface observations over the North Atlantic Ocean averaged over grid boxes with fuel consumption above 8 km greater than indicated on the x-axis (open circles). Data are from surface observations of Hahn et al. (1996) and are averaged over 3� x 3� grid boxes in the region 99�W to 21�E, 0�N to 72�N of the Atlantic Ocean. Only cloud reports satisfying the illuminance criterion defined by Hahn et al. (1995) are included in the statistics. The bold line indicates the number of grid boxes used for the average (adapted from Boucher, 1999).

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