Insignificant QBO‐MJO Prediction Skill Relationship in the SubX and S2S Subseasonal Reforecasts

Insignificant QBO‐MJO Prediction Skill Relationship in the SubX and S2S Subseasonal Reforecasts
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SubX 和 S2S 次季节重新预测中 QBO-MJO 预测技能关系不显着

DOI:
10.1029/2019jd031416
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发表时间:
2019
期刊:
Journal of Geophysical Research: Atmospheres
影响因子:
--
通讯作者:
Martin, Zane
Martin, Zane
中科院分区:
--
文献类型:
--
作者:
Kim, Hyemi;Richter, Jadwiga H.;Martin, Zane

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平流层准两年期振荡(QBO)对对流层马登-朱利安振荡(MJO)预测的影响在参与次季节预测项目的九个模型的重新预测中进行了评估,包括次季节实验(SubX)和次季节到季节(S2S)项目。当对12月至2月的MJO预测技能进行分析时,QBO东期的MJO预测技能高于西风期的MJO预测技能,这与之前的研究一致。然而,对于大多数模型来说,QBO 阶段和 MJO 预测技能之间的关系在统计上并不显着。通过使用社区大气模型 v5 的高顶(46 级)和低顶(30 级)版本将社区地球系统模型 v1 的两个次季节重新预测实验进行比较,进一步证实了这种微不足道的 QBO-MJO 技能关系。虽然两个模型顶部配置之间的预测 QBO 存在明显差异,但 MJO 预测中的变化可以忽略不计,表明该模型中的 QBO 可能不会直接控制 MJO 预测,并支持 SubX 和 S2S 模型中发现的不显着的 QBO-MJO 技能关系。
The impact of the stratospheric quasi‐biennial oscillation (QBO) on the prediction of the tropospheric Madden‐Julian oscillation (MJO) is evaluated in reforecasts from nine models participating in subseasonal prediction projects, including the Subseasonal Experiment (SubX) and Subseasonal to Seasonal (S2S) projects. When MJO prediction skill is analyzed for December to February, MJO prediction skill is higher in the easterly phase of the QBO than the westerly phase, consistent with previous studies. However, the relationship between QBO phase and MJO prediction skill is not statistically significant for most models. This insignificant QBO‐MJO skill relationship is further confirmed by comparing two subseasonal reforecast experiments with the Community Earth System Model v1 using both a high‐top (46‐level) and low‐top (30‐level) version of the Community Atmosphere Model v5. While there are clear differences in the forecasted QBO between the two model top configurations, a negligible change is shown in the MJO prediction, indicating that the QBO in this model may not directly control the MJO prediction and supporting the insignificant QBO‐MJO skill relationship found in SubX and S2S models.
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发表时间: 2019-08-27
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