Aviation and the Global Atmosphere

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Figure 6-15: Bar charts of radiative forcing in 2050 (a) from all perturbations (from IPCC, 1996), (b) from subsonic aviation (Fa1), and (c) from the additional effect due to supersonic air traffic. Note scale change from (a) to (b) and (c). In (b), best estimate (bars) and high-low 67% probability intervals (whiskers) are given. No best estimate is shown for cirrus clouds; rather, the dashed line indicates a range of possible estimates. The evaluations below the graph are relative appraisals of the level of scientific understanding associated with each component. In (c), white bars denote the direct effect of the supersonic fleet (HSCT1000), whereas the black bars display the change resulting from the displaced subsonic air traffic.

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