The MJO-QBO Relationship in a GCM with Stratospheric Nudging
The MJO-QBO Relationship in a GCM with Stratospheric Nudging
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DOI：
10.1175/jcli-d-20-0636.1
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发表时间：
2021-03
影响因子：
4.9
通讯作者：
Z. Martin;C. Orbe;Shuguang Wang;A. Sobel
中科院分区：
文献类型：
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作者：
Z. Martin;C. Orbe;Shuguang Wang;A. Sobel
观测研究表明，季内Madden-Julian振荡（MJO）和平流层准两年振荡（QBO）之间有很强的联系：当平流层下部的QBO是东风和西风时，北方冬季MJO更强，更可预测，并且具有不同的遥相关。尽管观测到的联系很强，但全球气候模式并没有产生MJO-QBO联系。在这里，作者使用当前一代的海洋-大气耦合的美国宇航局戈达德空间研究所全球气候模型（模型E2.1），以检查MJO-QBO链接。为了以最小的偏差表示QBO，将模式纬向平均平流层纬向风和纬向风放宽到1980-2017年的再分析场。模型对流层，包括MJO，允许自由发展。平流层轻推模式能很好地捕捉到QBO信号，包括QBO温度异常。然而，一个整体的轻推模拟仍然缺乏一个MJO-QBO连接。
Observational studies show a strong connection between the intraseasonal Madden-Julian oscillation (MJO) and the stratospheric quasi-biennial oscillation (QBO): the boreal winter MJO is stronger, more predictable, and has different teleconnections when the QBO in the lower stratosphere is easterly versus westerly. Despite the strength of the observed connection, global climate models do not produce an MJO-QBO link. Here the authors use a current-generation ocean-atmosphere coupled NASA Goddard Institute for Space Studies global climate model (Model E2.1) to examine the MJO-QBO link. To represent the QBO with minimal bias, the model zonal mean stratospheric zonal and meridional winds are relaxed to reanalysis fields from 1980-2017. The model troposphere, including the MJO, is allowed to freely evolve. The model with stratospheric nudging captures QBO signals well, including QBO temperature anomalies. However, an ensemble of nudged simulations still lacks an MJO-QBO connection.