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<br />. <br /> <br /> 50 100 <br /> 40 80 ~ <br /> 0 <br /> 30 60 lLJ <br /> > <br />It: ~ <br />lLJ <br />m ..J <br />~ 20 40 ::> <br />::> ~ <br />z ::> <br /> u <br /> 10 20 <br /> 0 0 <br /> -5 -3 -I 3 5 <br /> 8v I ( K) <br /> <br />. <br /> <br />. <br /> <br /> <br />. <br /> <br />Fig. 2.20:: Differential (thin line) and cumulative (heavy line) <br />distributions showing the cloud buoyancy for the same regions as in <br />Fig. 2.19. The cloud buoyancy was determined from the difference <br />between the cloud and the environmental virtual potential temperatures. <br /> <br />. <br /> <br />and buoyancies as large as :!:)oC were encountered less than 1% of the <br /> <br />. <br /> <br />time. Again, the distribution is similar to that measured in the NHRE <br /> <br />area (Fankhauser et al., 1982). It is evident that the majority of the <br /> <br />clouds were penetrated after an initial mixiQg process had led to <br /> <br />. <br /> <br />near-neutral buoyancy for most of the cloud regions; <br /> <br />this neutral <br /> <br />buoyancy state could not have characterized the early stages of the <br /> <br />clouds' lifetimes, or the cloud would not have developed. at all. This <br /> <br />. <br /> <br />resul t points to the problem that a majority of the measurements made <br /> <br />by the aircraft are late enough in the lifetime of the cloud to have <br /> <br />mi ssed the initial stages of development, and so many of the <br /> <br />. <br /> <br />conclusions (e.g. reg.arding the turbulent character of the updraft) <br /> <br />apply to the clouds at the time they were observed and perhaps not to <br /> <br />the early growth of the cloud. <br /> <br />. <br /> <br />30 <br /> <br />. <br />