Key points are not available for this paper at this time.
The 1993 James B. Macelwane Medal, given by AGU for significant contributions to the geophysical sciences by a young scientist of outstanding ability, was presented to Margaret Tolbert at the AGU Fall Meeting Honors Ceremony on December 8, 1993, in San Francisco, Calif. The award citation and Tolbert's response are given here.
Solomon et al. (Tue,) studied this question.