Circulations of the west Pacific jet stream.

Abstract

The jet stream of the west Pacific is a very steady feature of the winter circulation, with almost continuous intensification over East China and Japan and weakening in the central Pacific. Cross sections transverse to the jet stream in its intensification zone show a deep single-celled direct solenoidal circulation around a single frontal zone to be producing large increases of kinetic energy. Farther east, in the central Pacific, a strong indirect solenoidal circulation produces a strong decrease of kinetic energy. -from Author