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初夏青藏高原低涡发展东移的动力过程
Dynamic Processes of the Moving and Developing Lows on the Qinghai–Xizang Plateau During the Early Summer
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摘要: 通过对1980—1983年6月青藏高原低涡发展东移和原地生消过程的分析和计算，提出高原300 hPa西南风急流与低涡发展并东移相联系的事实。又指出散度方程中A（平流作用）项和fζ＇（非地转效应）项的作用。而急流的存在直接导致A和fζ＇的增大，构成了低涡发展东移的动力因素。最后用平流变化方程和调整变化方程进一步论述了由于高原300 hPa西南风急流的存在，低涡沿急流轴北侧发展东移的动力过程。Abstract: Through analysis of the processes of the developing and disappearing lows on the Qinghai –Xizang Plateau in June 1980—1983, the relationships between 300 hPa southwest jet and the moving and developing lows on Qinghai–Xizang Plateau have been obtained, and the action of A (advection) and fξ’ (nongeostrophic) terms in divergence equation have been discussed. The existence of jet determines directly an increase in A and fξ’ terms. It is an important dynamic cause for the lows eastward moving and developing. Finally, the dynamic processes of the lows developing and moving along the northern side of jet’s axis have been detailed by advection equation and adjustment equation
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