中文摘要：

atmospheric-angular-momentum (AAM ) 和不同 timescales 上的 length-of-day (LOD ) 的特征在这份报纸被调查，根据为 19622010 的 NECP/NCAR 分析数据和 LOD 数据集。变化和在不同纬度的 AAM 异例(AAMA ) 的全面趋势被介绍，并且在 AAMA 和 LOD 之间的关系被讨论。在不同纬度区域的 AAMA 在热带展出变化，和 AAMA 的不同模式做主导的贡献到全球 AAMA。在热带， AAMA 宣传 poleward 到热带以外的区域。这被证实一向下， AAMA 的繁殖发生在更低的平流层。关联分析证明在 AAMA 和 LOD 之间的关系在不同 timescales 上显著地变化。明确地，热带 AAMA 断然在短 timescales 上与 LOD 被相关，但是他们显然没在长 timescales 上被相关。这显示在尖动量跟随的 AAM 和地球之间的相互作用短 timescales 上的保守限制，而是空气的上的尖动量取决于的地球的影响长 timescales 上的相互作用过程。

英文摘要：

The characteristics of atmospheric-angular-momentum （AAM） and length-of-day （LOD） on different timescales are investigated in this paper, on the basis of the NECP/NCAR reanalysis data and an LOD dataset for 1962-2010. The variation and overall trend of the AAM anomaly （AAMA） at different latitudes are presented, and the relationship between AAMA and LOD is discussed. The AAMAs in different latitude regions exhibit different patterns of variation, and the AAMA in the tropics makes a dominant contribution to the global AAMA. In the tropics, the AAMA propagates poleward to the extratropical regions. It is confirmed that a downward propagation of the AAMA occurs in the lower stratosphere. Correlation analysis shows that the relationship between AAMA and LOD varies significantly on different timescales. Specifically, the tropical AAMA is positively correlated with LOD on short timescales, but they are not obviously correlated on long timescales. This indicates that the interaction between AAM and the earth＇s angular momentum follows the conservative restriction on short timescales, but the influence of the earth angular momentum on that of the atmosphere depends on the interaction process on long timescales.