The monthly averaged basic air current was approximately the barotropic instable condition which was measured by the meridional gradient of absolute vorticity.
对于这个月月平均基本气流，进行正压不稳定度判据的检定，发现存在接近正压不稳定的条件。
The reversal of meridional temperature gradient over South Asia is mainly a result of subsidence.
造成南亚季风区经向温度梯度逆转的原因是下沉增温。
The change of meridional temperature gradient influences the strength of the mean meridional circulation and the westerly jets directly.
经向温度梯度的改变，直接影响到对平均经圈环流及西风急流强度的模拟。
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