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Springtime Convective Quasi-Biweekly Oscillation and Interannual Variation of Its Intensity over the South China Sea and Western North Pacific

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Abstract

This study investigates characteristics of the convective quasi-biweekly oscillation (QBWO) over the South China Sea (SCS) and western North Pacific (WNP) in spring, and the interannual variation of its intensity. Convective QBWO over the WNP and SCS shows both similarities and differences. Convective QBWO over the WNP originates mainly from southeast of the Philippine Sea and propagates northwestward. In contrast, convective QBWO over the SCS can be traced mainly to east of the Philippines and features a westward propagation. Such a westward or northwestward propagation is probably related to n = 1 equatorial Rossby waves. During the evolution of convective QBWO over the WNP and SCS, the vertical motion and specific humidity exhibit a barotropic structure and the vertical relative vorticity shows a baroclinic structure in the troposphere. The dominant mode of interannual variation of convective QBWO intensity over the SCS-WNP region in spring is homogeneous. Its positive phase indicates enhanced convective QBWO intensity accompanied by local enhanced QBWO intensity of vertical motion throughout the troposphere as well as local enhanced (weakened) QBWO intensity of kinetic energy, vertical relative vorticity, and wind in the lower (upper) troposphere. The positive phase usually results from local increases of the background moisture and anomalous vertical shear of easterlies. The latter contributes to the relationship between the dominant mode and QBWO intensities of kinetic energy, vertical relative vorticity, and wind. Finally, a connection between the dominant mode and the sea surface temperature anomalies in the tropical Pacific Ocean is demonstrated.

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Authors and Affiliations

  1. Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Bei**g, 100029, China

    Zhiqing Xu, Ke Fan & Huijun Wang

  2. Climate Change Research Center, Chinese Academy of Sciences, Bei**g, 100029, China

    Zhiqing Xu & Huijun Wang

  3. University of the Chinese Academy of Sciences, Bei**g, 100049, China

    Ke Fan

  4. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nan**g University of Information Science &Technology, Nan**g, 210044, China

    Huijun Wang

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  1. Zhiqing Xu
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Correspondence to Zhiqing Xu.

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Supported by the China Meteorological Administration Special Public Welfare Research Fund (GYHY201506001) and National Natural Science Foundation of China (41421004, 41730964, and 41325018).

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Xu, Z., Fan, K. & Wang, H. Springtime Convective Quasi-Biweekly Oscillation and Interannual Variation of Its Intensity over the South China Sea and Western North Pacific. J Meteorol Res 33, 323–335 (2019). https://doi.org/10.1007/s13351-019-8167-1

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