Abstract
This study identified three distinct circulation patterns that induce enhanced intraseasonal precipitation events (IPEs) over South China (SC) in boreal winter based on observational data of 1979–2016. The three categories account for 45%, 33% and 14% of total IPEs, respectively. In Category I, a cyclonic anomaly with quasi-barotropic vertical structure propagates southward from the northern Asia while no signal of the Madden–Julian Oscillation (MJO) is observed. Category II (III) is featured by a fast (slow)-propagating MJO that shows suppressed (enhanced) convection over the equatorial western Pacific (Maritime Continent) during the peak-wet phase of SC. The common process responsible for the onset of IPEs is boundary-layer moistening dominated by mean moisture advection due to intraseasonal southerly wind. For Category I, the anomalous southerly arises from the southwesterly to the southeast of the mid-latitude cyclone. For Category II, it is attributed to the southwesterly to the west of the anticyclone over the northwestern Pacific, as a response to the suppressed MJO convection over the western Pacific. For Category III, it is due to the southwesterly to the east of the cyclone over India in response to the enhanced MJO convection over the eastern Indian Ocean. The moisture origins for the three categories are also distinguishable.
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The data analyzed in this study are available from the author upon reasonable request.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (42088101 and 41975108), NOAA grant NA18OAR4310298 and NSFC-Shandong Joint Fund for Marine Science Research Centers (U1606405), Jiangsu College Students’ innovation and entrepreneurship training program (202210300066z).
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LW designed the original ideas presented in this manuscript. JJ, XZ and ZC conducted the analysis. LW and JJ interpreted the results and wrote the manuscript. TL participated in improvement of the manuscript. All authors read and approved the final manuscript.
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Wang, L., Jiang, J., Li, T. et al. Three distinct circulation patterns that induce enhanced intraseasonal precipitation events over South China in boreal winter. Clim Dyn 60, 2893–2905 (2023). https://doi.org/10.1007/s00382-022-06478-9
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DOI: https://doi.org/10.1007/s00382-022-06478-9