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Diurnal variations of precipitation over the South China Sea

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Abstract

In this study, the diurnal variations of precipitation and related mechanisms over the South China Sea (SCS) are studied using the TRMM and other auxiliary atmospheric data. We have found that: (1) the amplitude and peak time of the diurnal precipitation over SCS exhibit remarkable regional features and seasonal variations. Diurnal variations are robust all the year around over the southern SCS especially over the Kalimantan Island and its offshore area. Over the middle to northern SCS, however, diurnal variations are noticeable only in the summer and autumn; (2) over the northern SCS precipitation peaks in early morning, while over the southern SCS it has two diurnal peaks: one in the early morning and another in the late afternoon; (3) the diurnal variations of precipitation over the SCS are related to the activity of the SCS summer monsoon and the ENSO events. The late afternoon precipitation increases remarkably after the onset of the SCS summer monsoon over the northern SCS. The early-morning rainfall peak is much more significant during La Nina years than during El Nino years; (4) the land–sea breeze is responsible for the diurnal cycle over the Kalimantan Island and its offshore area while the “static radiation–convection” mechanisms may result in the early-morning rainfall peak over the SCS.

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Acknowledgments

This work was supported by the Joint Fund Project (U0733002) of the National Natural Science Foundation of China (NSFC), the NSFC project (40875020) and the National Basic Research Program of China (2009CB421404). The authors would like to acknowledge GSFC/DAAC, NASA for providing valuable TRMM data. The QUIKSCAT and ADEOS-II/NCEP Blended Winds for this study are from the Research Data Archive (RDA) which is maintained by the Computational and Information Systems Laboratory (CISL) at the National Center for Atmospheric Research (NCAR). Helpful comments by Dr. Houjun Wang on the revised version are gratefully acknowledged.

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Li, W., Luo, C., Wang, D. et al. Diurnal variations of precipitation over the South China Sea. Meteorol Atmos Phys 109, 33–46 (2010). https://doi.org/10.1007/s00703-010-0094-8

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