G. P. Kurbatkin, A. I. Degtyarev, and O. P. Skrotskaya
Institute for Global Climate and Ecology, Glebovskaya ul. 20b, Moscow, 107258 Russia
Received July 10, 1998; in final form, December 7, 1998
Abstract—Results of numerical experiments with a Global Circulation Model (GCM) [6] are used to analyze
the atmospheric circulation features in the transition periods (spring and fall). Computations with an actual
annual cycle of solar insolation are compared to those with a fixed sun’s declination corresponding to the mid-
dles of April and October. Primary attention is given to dynamic circulation features obtained in the experi-
ments. The numerical results confirm the hypothesis [3] that the southern position of the upper-tropospheric jet
streams persists long in spring only when the insolation is progressively increased and that the northern position
of the jet streams persists long in fall only when the insolation is progressively decreased.
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