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Advances in Atmospheric Sciences

, Volume 36, Issue 11, pp 1203–1216 | Cite as

Meridional Displacement of the East Asian Upper-tropospheric Westerly Jet and Its Relationship with the East Asian Summer Rainfall in CMIP5 Simulations

  • Yuhan Yan
  • Chaofan LiEmail author
  • Riyu Lu
Original Paper
  • 37 Downloads

Abstract

As the first leading mode of upper-tropospheric circulation in observations, the meridional displacement of the East Asian westerly jet (EAJ) varies closely with the East Asian rainfall in summer. In this study, the interannual variation of the EAJ meridional displacement and its relationship with the East Asian summer rainfall are evaluated, using the historical simulations of CMIP5 (phase 5 of the Coupled Model Intercomparison Project). The models can generally reproduce the meridional displacement of the EAJ, which is mainly manifested as the first principal mode in most of the simulations. For the relationship between the meridional displacement of the EAJ and East Asian rainfall, almost all the models depict a weaker correlation than observations and exhibit considerably large spread across the models. It is found that the discrepancy in the interannual relationship is closely related to the simulation of the climate mean state, including the climatological location of the westerly jet in Eurasia and rainfall bias in South Asia and the western North Pacific. In addition, a close relationship between the simulation discrepancy and intensity of EAJ variability is also found: the models with a stronger intensity of the EAJ meridional displacement tend to reproduce a closer interannual relationship, and vice versa.

Key words

East Asian westerly jet meridional teleconnection East Asian rainband model simulation 

摘要

夏季东亚西风急流(EAJ)的经向偏移是对流层上层环流年际变化的主导模态, 且与东亚降水的变化密切相关。本研究利用耦合模式比较计划第五阶段(CMIP5)的历史模拟试验, 对EAJ经向偏移的年际变化及其与东亚降水的关系模拟进行了评估。CMIP5模式能较好地再现出EAJ的经向偏移特征, 在大多数模式中表现为第一模态。而对于EAJ经向偏移与东亚降水的关系, 几乎所有的模式都弱化了这种关系, 并且在模式之间存在相当大的离散度。研究表明, 这种年际关系的模拟差异与气候平均态的模拟密切相关, 其中包括欧亚大陆西风急流的气候态位置以及南亚和西北太平洋的降水偏差。此外, 年际关系的模拟差异还与EAJ的变率强度之间存在紧密联系: EAJ经向偏移强度越大的模式模拟的关系越接近观测。

关键词

东亚西风急流 经向遥相关 东亚雨带 模式模拟 

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Notes

Acknowledgments

We thank the two anonymous reviewers and the editor for their constructive comments. This work was supported by the National Key Research and Development Program of China (Grant No. 2018YFA0606501) and the National Natural Science Foundation of China (Grant Nos. 41721004, U1502233 and 41775083).

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© Institute of Atmospheric Physics/Chinese Academy of Sciences, and Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.College of Earth and Planetary SciencesUniversity of the Chinese Academy of SciencesBeijingChina
  3. 3.Center for Monsoon System Research, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

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