Unraveling Aircraft Impacts

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Science  01 Oct 1999:
Vol. 286, Issue 5437, pp. 57-58
DOI: 10.1126/science.286.5437.57

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Aircraft emissions are likely to alter atmospheric chemistry at cruise altitudes, but quantifying these effects has been difficult. Two recent aircraft campaigns are providing much-needed constraints on the atmospheric chemistry at the relevant altitudes, in a region where effects would be expected to be relatively large--above North America, Europe, and the North Atlantic flight corridor. On the basis of these field data, the global climate forcing of aircraft-induced ozone change is expected to be at the lower end of model estimates.