Abstract
Based on daily precipitation observation data in China, the intraseasonal oscillation (ISO) features of summer precipitation over southern China in 2019 have been investigated by wavelet and band-pass filtering analyses. The results show that enhanced (suppressed) precipitation occurred over southern China during early (late) boreal summer 2019. The signals of both 10–20- and 30–60-day ISO in southern China are remarkable, with the amplitude of the 10–20-day ISO larger than the 30–60-day ISO in boreal summer 2019. The synergistic effect of the 10–20- and 30–60-day ISO wet phases was found to exert a tremendous influence on persistent heavy precipitation in July 2019, when the amount of precipitation reached its maximum in southern China since 1981. The atmospheric circulation and convection evolution characteristics of both 10–20- and 30–60-day ISO are further investigated. An anomalous low-level anticyclone over the South China Sea is prominently linked to the wet phase of the 10–20-day ISO, whereas an anomalous low-level cyclone over southern China is dominantly associated with the wet phase of the 30–60-day ISO. Both events enhance the water vapor convergence and ascending motion over southern China. Thus, the atmospheric circulation that accompanied the synergism of the wet phases of the 10–20- and 30–60-day ISO resulted in persistent heavy precipitation over southern China in July 2019.
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Acknowledgments
The authors thank the Innovation Team of Climate Prediction Theory and Application of the China Meteorological Administration, the Innovation Team of Subseasonal to Seasonal Climate Prediction of the Sichuan Meteorological Bureau, and the Climate Science for Service Partnership (CSSP) for their support. We also appreciate the two anonymous reviewers whose comments and suggestions greatly helped to improve the paper.
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Supported by the National Key Research and Development Program of China (2018YFC1505603), National Natural Science Foundation of China (41975088 and 41575074), China Meteorological Administration Special Public Welfare Research Fund (GYHY201306024), and State Oceanic Administration International Cooperation Program (GASI-IPOVAI-03).
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Hong, J., Ke, Z., Yuan, Y. et al. Boreal Summer Intraseasonal Oscillation and Its Possible Impact on Precipitation over Southern China in 2019. J Meteorol Res 35, 571–582 (2021). https://doi.org/10.1007/s13351-021-0189-9
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DOI: https://doi.org/10.1007/s13351-021-0189-9