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Application NCEP / NCAR 40 reanalysis plans to provide wind field , pressure field , SST data as well as the International Earth Rotation Service Agency (IERS) changes in day length information to calculate atmospheric angular momentum , vertical transportation analysis of its climate and abnormal characteristics , and found that the angular momentum transport and zonal circulation to maintain consistent , the abnormal angular momentum is closely related to the El Nino events . Friction , and mountains moment analysis calculated that the mountains and the friction torque is the same order of magnitude , similar to seasonal variation , but the spatial distribution of the friction torque compared Mountains torque . Correlation analysis showed that the angular momentum and Nino Three Harbour gentle good positive correlation between angular momentum and the mountains , the friction torque were positive , negative correlation . Cross- spectral analysis shows that , in less than one year cycle , there is a significant correlation between the angular momentum , the mountains and the friction torque , SST Nino Third District , the length of day . Significantly on the time scale of greater than one year , cycle and El Nino events cycle are closely linked. The above work for a long period of time the atmospheric angular momentum balance all aspects of a complete system analysis , including multi-year average and abnormal features analysis and angular momentum transport , the earth-atmosphere system angular momentum exchange ( friction and mountain torque ) , day - long , Nino 3 SST associated confirmed atmospheric angular momentum changes in the Earth's rotation , the close link between El Nino events .
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