Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
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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