Influence of the QBO on the MJO During Coupled Model Multiweek Forecasts
Influence of the QBO on the MJO During Coupled Model Multiweek Forecasts
复制标题
耦合模型多周预报期间 QBO 对 MJO 的影响
DOI：
10.1029/2019gl083152
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发表时间：
2019
影响因子：
5.2
通讯作者：
H. Hendon
中科院分区：
文献类型：
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作者：
S. Abhik;H. Hendon
马登-朱利安涛动（MJO）的季节性活动在南方夏季更大，此时平流层低层风处于准两年一次涛动（QBO）的东风期。利用两个耦合模式季节预测系统的初始化预测，我们发现在模式偏差变得太大之前的前几天，QBO对MJO振幅的系统性影响。在观测到的两个模式中，尽管QBO的初始振幅相似，但东风相和西风相之间的MJO振幅差异随着提前时间的增加而增加。对流层顶失稳增强是QBO东风期MJO对流增强的关键机制。讨论了模型无法重现观测到的MJO - QBO关系强度的注意事项。
Seasonal activity of the Madden‐Julian Oscillation (MJO) is observed to be greater during austral summer when the lower stratospheric winds are in the easterly phase of the quasi‐biennial oscillation (QBO). Using initialized predictions from two coupled model seasonal prediction systems, we show a systematic impact of the QBO on the amplitude of the MJO during the first few days of the forecast before model biases become too large. In both models as for the observed, the difference in MJO amplitude between easterly phases and westerly phases of the QBO increases with lead time, despite having similar initial amplitudes. Enhanced destabilization of the tropopause is argued to be the key mechanism that promotes stronger MJO convection during easterly phase of QBO. Caveats for the inability of the models to reproduce the observed strength of the MJO‐QBO relationship are discussed.
DOI：
10.5194/gmd-2016-194-supplement
发表时间：
2017
期刊：
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影响因子：
--
作者：
D. Walters;I. Boutle;M. Brooks;T. Melvin;R. Stratton;S. Vosper;H. Wells;K. Williams;N. Wood
通讯作者：
D. Walters;I. Boutle;M. Brooks;T. Melvin;R. Stratton;S. Vosper;H. Wells;K. Williams;N. Wood