The annual change of the Earth's rotation iS excited about 60% by the annual change of zonal wind velocity, and the semi-annual term as well as other periodic terms are about 15%.

北半球的大气环流对自转速率周年项的激励约为60％，对半年项及其他短周期项的贡献约为15％以上。

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The annual change of the Earth's rotation iS excited about 60% by the annual change of zonal wind velocity, and the semi-annual term as well as other periodic terms are about 15%.

北半球的大气环流对自转速率周年项的激励约为60％，对半年项及其他短周期项的贡献约为15％以上。

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