Influence of the solar cycle and QBO modulation on the Southern Annular Mode
Influence of the solar cycle and QBO modulation on the Southern Annular Mode
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DOI：
10.1029/2010gl043252
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发表时间：
2010-06
影响因子：
5.2
通讯作者：
Y. Kuroda;K. Yamazaki
中科院分区：
文献类型：
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作者：
Y. Kuroda;K. Yamazaki
利用欧洲中期天气预报中心（ECMWF）联合再分析资料，研究了11年太阳活动周期和平流层赤道准两年振荡（QBO）对冬末/春季南半球环形模（SAM）的影响。结果表明，该信号受太阳活动周期和QBO的强烈影响。关于太阳活动周期的影响，在太阳活动高的年份，信号延伸到平流层上部，并持续到下一个夏天，但在太阳活动低的年份，信号仅限于对流层，并很快消失。对于QBO，信号在冬末/春季延伸到平流层上部，但在QBO-west年的夏季消失。另一方面，信号随着时间的演变而垂直延伸，并倾向于持续到QBO-east年的下一个夏天。当同时考虑太阳活动周期和QBO时，太阳活动周期的影响占主导地位，QBO的影响则是线性叠加的。本文还讨论了臭氧对太阳活动周期和QBO调制的作用。
Influence of the 11‐year solar cycle and the stratospheric equatorial Quasi‐Biennial Oscillation (QBO) on the Southern Annular Mode (SAM) in late winter/spring is examined through the analysis of combined reanalysis data of ECMWF. It is found that the signal is strongly affected by both the solar cycle and the QBO. Regarding the effect of the solar cycle, the signal extends to the upper stratosphere and persists into the following summer in years with high solar activity, but it is restricted to the troposphere and disappears very quickly in years with low solar activity. For the QBO, the signal extends to the upper stratosphere in late winter/spring but disappears in the following summer in QBO‐west years. On the other hand, the signal extends vertically as the time evolution and tends to persist into the following summer in QBO‐east years. When both the solar cycle and the QBO are considered, the effects from the solar cycle dominate and those from the QBO work as linearly superimposed factors. Role of ozone on the solar cycle and QBO modulation is also discussed.