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Enhancement of lower tropospheric winter synoptic temperature variations in Southwest China and the northern Indochina Peninsula after 2010

  • Marco Y. T. Leung
  • W. ZhouEmail author
  • K. Y. Cheung
  • H. N. Gong
  • Y. Zhang
Article

Abstract

In this study, long-term change in winter synoptic temperature variations in Southwest China and the northern Indochina Peninsula from 1979 to 2017 (39 years) is documented. A sharp increase in synoptic temperature variation is found after 2010, indicating stronger day-to-day temperature change in the last decade. The increasing variation is attributed to stronger horizontal wind on a synoptic timescale after 2010. On the other hand, transient eddies show stronger intensity after 2010 when approaching Southwest China and the northern Indochina Peninsula (SWCNIP), contributing to the stronger synoptic horizontal wind. According to the eddy kinetic energy budget, the stronger horizontal wind is due primarily to the larger baroclinic energy conversion from eddy potential energy to eddy kinetic energy after 2010. Furthermore, a larger potential energy conversion from the mean flow to transient eddies is observed in SWCNIP after 2010. This plays an important role in sustaining the intensity of transient eddies. It is also noted that the intensification of transient eddies after 2010 is caused by warming in the western tropical Pacific and the Bay of Bengal and strengthened synoptic eddies along the southern part of the Tibetan Plateau.

Keywords

Transient eddies Eddy kinetic energy Eddy potential energy Energy conversion 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (41805042) and the Research Grants Council of the Hong Kong Special Administrative Region, China (CityU 11335316 and 11306417).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and EnvironmentCity University of Hong KongHong KongChina
  2. 2.CityU Shenzhen Research InstituteShenzhenChina
  3. 3.Center for Monsoon System Research, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

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