Figure 343
Fig. 343
normal (435x430, 9 KB) large (1024x1013, 26 KB) EPS (17 KB)
Correlation of mean annual contrail frequency and estimated May 1990 aircraft fuel usage above 7-km altitude. Contrail frequencies are based on 1993 to 1994 hourly surface observations from 19 stations in the USA (Minnis et al., 1997). The fit to the data (solid line) is shown. R is the correlation coefficient.