中文摘要：

用日报和月刊，表面的数据为时期从 NCEP/NCAR 分析让压力，南方的风，放射和水蒸汽通风 1979 2006，我们检验了季节的变化内部在质量中的半球的摆动(IHO ) 全球空气回答。我们的结果表明了在表面空气压力观察到领域显示出不同季节的周期的那 IHO。这个季节的周期有一内部有表面的可比较的年度范围的半球的跷跷板结构在南部、北的半球让压力通风。在南部、北的半球之间的水蒸汽变化 out-of-phase 集中，清楚地显示出有它几乎等价于 IHO 季节的周期的年度范围的年度范围的一个季节的周期。惊人地，跨 equatorial 流动被发现被年度变化作为对突然从半球的网表面强迫的季节的周期的空气的回答在水蒸汽质量中导致 -- 并且长波浪的放射。IHO seasonality 在大小展出它的更大的变化在除在地球的另外的区域以外中间纬度。另外，我们的结果也证明全球空气团是不仅在北、南部的半球之间而且在土地和海之间的再分配的季节联盟者。这陆地海空气团再分配在北半球导致表面空气压力的一个带的模式但是在南部的半球的南方的模式。

英文摘要：

Using the daily and monthly data of surface air pressure, meridional wind, radiation and water vapor from NCEP/NCAR reanalysis for the period of 1979-2006, we have examined the seasonal variations of the interhemispheric oscillations （IHO） in mass field of the global atmosphere. Our results have demonstrated that IHO as observed in surface air pressure field shows the distinct seasonal cycle. This seasonal cycle has an interhemispheric seesaw structure with comparable annual ranges of surface air pressure in the Southern and Northern Hemispheres. Mass of water vapor changes out-of-phaee between the Southern and Northern Hemispheres, showing clearly a seasonal cycle with its annual range almost equivalent to annual range of the IHO seasonal cycle. Amazingly, the cross-equatorial flow is found to be induced by annual changes in water vapor mass as a response of the atmosphere to seasonal cycle of forcing from hemispheric net surface short- and long-wave radiations. The IHO seasonality exhibits its larger variations in magnitude in mid-latitudes other than in other regions of the globe. Additionally, our results also show that the global air mass is redistributed seasonally not only between the Northern and Southern Hemispheres but also between land and sea. This land-sea air mass redistribution induces s zonal pattern of surface air pressure in the Northern Hemisphere but the meridional pattern in the Southern Hemisphere.