检验南极摆动(AAO ) 的带的不对称现象,到在大西洋热带飓风数字(ATHN ) 的 interannual 可变性的 10 月(JJASO ) 的从 6 月的 AAO 的不同部分在这研究被记录。因而,在西方的半球(AAOWH ) 的 AAO 断然在 1871-1998 的时期期间与 ATHN 被相关,在 0.36 点并且 0.42 在 1949-98 的时期期间。在在所有时间系列在南部的摆动索引(SOI ) 上移开线性回归以后,上述关联系数分别地是 0.25 和 0.30。内在的机制通过与 AAOWH 联系的大气的一般发行量可变性的分析被学习。结果积极(否定) JJASO AAOWH 的阶段与几个因素相应:减少(增加) 垂直的带的风砍大小,低级异常集中(分叉) ,高级异常分叉(集中) ,并且温暖(冷却) 在热带大西洋的海表面温度。因此,积极(否定) JJASO AAOWH 的阶段是有利的(相反) 到热带飓风开始。
To examine the zonal asymmetry of the Antarctic oscillation (AAO), different portions of the AAO from June to October (JJASO) in the interannual variability of the Atlantic tropical hurricanes number (ATHN) are documented in this research. It follows that the AAO in the Western Hemisphere (AAOWH) is positively correlated with the ATHN, at 0.36 during the period of 1871-1998 and 0.42 during the period of 1949-98. After removing the linear regressions on the Southern Oscillation Index (SOI) in all time series, the above correlation coefficients are 0.25 and 0.30, respectively. The underlying mechanisms are studied through analyses of the atmospheric general circulation variability associated with the AAOWH. It turns out that the positive (negative) phase of JJASO AAOWH corresponds with several factors: decreased (increased) vertical zonal wind shear magnitude, low-level anomalous convergence (divergence), high-level anomalous divergence (convergence), and warmed (cooled) sea surface temperature in the tropical Atlantic. Therefore, the positive (negative) phase of JJASO AAOWH is favorable (unfavorable) to the tropical hurricane genesis.