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WALLACE B. MURCRAY

Abstract

The possible effect of contrails in modifying the weather is reconsidered in the light of information obtained from ground-level contrails in Alaska. It appears likely that inadvertent cloud seeding by jet aircraft may be of the same order of magnitude as that attained in commercial cloud seeding operations. Further investigation is needed; but in the meantime, the possibility of contrail contamination should be kept in mind when evaluating the results of seeding operations.

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Sue Ann Bowling, Carl S. Benson, and Wallace B. Murcray

Abstract

A previous attempt to calculate the temperature gradient around a growing ice crystal in clear air started with the radiation budget of the crystal plus the assumption that the measured frost point temperature (about 2C below air temperature) represented the crystal temperature. When the conductivity equation for the air around the crystal is fully solved with the radiation budget as the boundary condition, however, it is found that less than 0.03C temperature difference can be sustained by radiative cooling of the crystals. The most probable explanation of the difference between the two approaches is that the humidity measurements are in error, and that the error has been generally recognized only at measured humidities in excess of 100%.

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