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The authors investigate the transient behavior of the Asian monsoon anticyclone in the summertime upper troposphere for the four northern summers 1987–90. The evolution of potential vorticity near the tropopause shows the development of westward migrating anticyclones breaking off from the main anticyclone a few times each summer. These disturbances are relatively shallow, being confined to the upper troposphere.
Popović et al. (Mon,) studied this question.