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Climate Dynamics

, Volume 51, Issue 11–12, pp 4123–4137 | Cite as

Structure and dynamics of a wave train along the wintertime Asian jet and its impact on East Asian climate

  • Kaiming Hu
  • Gang HuangEmail author
  • Renguang Wu
  • Lin Wang
Article

Abstract

Based on observational and reanalysis datasets, this study investigates the structure and dynamics of a wave-like atmospheric teleconnection pattern along the wintertime Asian jet and its influence on East Asian climate. Along the jet, the leading empirical orthogonal function (EOF) mode of monthly meridional winds at 250-hPa in winter (December, January, and February) is organized as a wave train with maximum anomalies at upper troposphere. The wave train propagates northeastward from the North Atlantic to Europe, turns southeastward to the Middle East with amplifying amplitude, propagates along the jet to South China, and reaches Japan, which is partly induced by sea surface temperature (SST) anomalies in the equatorial eastern Pacific and the North Atlantic Oscillation. Over the sector from Europe to the Middle East, the anomalous vortices in the wave train tilt northwestward with height and tilt northeast/southwest in horizontal at 250 hPa, favoring for extracting available potential energy and kinetic energy from mean flows effectively. In addition, there exists a positive feedback between transient eddies and the wave train-related anomalous circulation over the North Atlantic and Europe. These processes help to maintain and amplify the wave train. Moreover, the wave train can exert significant influences on the wintertime climate in East Asia. When it is in the phase with a cyclone (anticyclone) over South China (Japan), rainfall tends to be above normal in South and East China and surface air temperature tends to be above normal around Japan and the Korea peninsula.

Keywords

Wave train Wintertime Asian Jet East Asian climate 

Notes

Acknowledgements

We thank two anonymous reviewers for their helpful comments. This work was supported by the National Natural Science Foundation of China (41425019, 41661144016, 41275081 and 41205049) and the public science and technology research funds projects of ocean (201505013).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Kaiming Hu
    • 1
  • Gang Huang
    • 1
    • 2
    • 3
    Email author
  • Renguang Wu
    • 1
  • Lin Wang
    • 1
  1. 1.Center for Monsoon System Research and State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Joint Center for Global Change Studies (JCGCS)BeijingChina
  3. 3.University of Chinese Academy of SciencesBeijingChina

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