The Lack of QBO‐MJO Connection in CMIP6 Models

The Lack of QBO‐MJO Connection in CMIP6 Models
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CMIP6 模型中缺乏 QBO–MJO 连接

DOI:
10.1029/2020gl087295
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发表时间:
2020
影响因子:
5.2
通讯作者:
Simpson, Isla R.
Simpson, Isla R.
中科院分区:
地球科学1区
文献类型:
--
作者:
Kim, Hyemi;Caron, Julie M.;Richter, Jadwiga H.;Simpson, Isla R.

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观测分析表明,平流层准两年振荡(QBO)和对流层马登-朱利安振荡(MJO)之间有很强的联系,MJO活动在QBO的东风阶段比西风阶段更强。我们评估了参与耦合模型相互比较项目6的30个模型中QBO-MJO连接的代表性。虽然一些模型合理地模拟了北半球冬季的QBO,但它们都没有捕捉到东风和西风QBO之间MJO活动的差异,该差异大于从内部变率的随机抽样中预期的差异。模拟的QBO-MJO连接的弱信号可能是由于QBO的振幅比观察到的要弱,特别是在100到50 hPa之间。在模式中,这种较弱的振幅在QBO相关的纬向风和温度中都可以看到,后者被认为是不稳定热带对流的关键。
Observational analysis has indicated a strong connection between the stratospheric quasi‐biennial oscillation (QBO) and tropospheric Madden‐Julian oscillation (MJO), with MJO activity being stronger during the easterly phase than the westerly phase of the QBO. We assess the representation of this QBO‐MJO connection in 30 models participating in the Coupled Model Intercomparison Project 6. While some models reasonably simulate the QBO during boreal winter, none of them capture a difference in MJO activity between easterly and westerly QBO that is larger than that which would be expected from the random sampling of internal variability. The weak signal of the simulated QBO‐MJO connection may be due to the weaker amplitude of the QBO than observed, especially between 100 to 50 hPa. This weaker amplitude in the models is seen both in the QBO‐related zonal wind and temperature, the latter of which is thought to be critical for destabilizing tropical convection.
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