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Coupling of the Quasi-Biweekly Oscillation of the Tibetan Plateau Summer Monsoon With the Arctic Oscillation
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  • Meirong Wang,
  • Jun Wang,
  • Anmin Duan,
  • Yimin Liu,
  • Shunwu Zhou
Meirong Wang
NUIST Nanjing University of Information Science and Technology
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Jun Wang
Nanjing University

Corresponding Author:[email protected]

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Anmin Duan
Insititute of Atmospheric Physics, Chinese Academy of Sciences
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Yimin Liu
Inst. of Atmospheric Physics
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Shunwu Zhou
NUIST
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Abstract

The intraseasonal variation of the Tibetan Plateau summer monsoon (TPSM) during 1979–2011 is investigated. The TPSM shows a dominant quasi-biweekly oscillation (QBWO) in most summer seasons, and its active/break phases are closely related to more/less precipitation over the Tibetan Plateau. We suggest that the TPSM QBWO is associated with a southeastward propagating nonstationary wave train in the middle and upper troposphere. It shows equivalent barotropic vertical structures over the midlatitudes and a baroclinic structure over the eastern Tibetan Plateau. Wave activity flux analysis indicates that it originates from northern Europe, which is an active center of the summertime Arctic Oscillation (AO). The AO also shows significant QBWO signals and leads TPSM QBWO by about 13 days. Phase composite and wave activity flux analyses of AO QBWO confirmed that the wave train influences TPSM QBWO, suggesting that AO plays an important role in the TPSM on a 10- to 20-day timescale.
16 Aug 2018Published in Geophysical Research Letters volume 45 issue 15 on pages 7756-7764. 10.1029/2018GL077136