%0 Journal Article %A Wei YANG %A Wen FENG %A Li ZENG %A Youlong CHEN %T Temporal and Spatial Distribution and Anomalous Circulation Characteristics of Winter Rainstorms in Hainan Province %D 2021 %R 10.11755/j.issn.1006-7639(2021)-05-0759 %J Journal of Arid Meteorology %P 759-765 %V 39 %N 5 %X

Based on daily precipitation data at eighteen meteorological stations of Hainan Island, and 6-hour NCEP reanalysis data in winter from 1951 to 2016, the temporal and spatial distribution characteristics of winter rainstorms in Hainan Island were analyzed statistically. And the main influencing synoptic systems and anomalous circulation characteristics of winter rainstorms were contrastively analyzed, taking two persistent rainstorm processes from 27 to 28 December 2008 and 14 to 15 December 2013 in Hainan Island as examples. The results are as follows: (1) The winter rainstorms were easily to occur in the early winter (December) in Hainan Island, and its inter-annual and inter-decadal variation characteristics were obvious during 1951-2016, the winter rainstorms were frequent since 2000. (2) The days and precipitation of winter rainstorms increased gradually from west to east in Hainan Island, and the center of winter rainstorms located in Wanning of southeastern Hainan Island. (3) During the rainstorm processes in winter, Hainan was in front of southern branch trough and the back of the bottom of cold high. The easterly jet maintained in low layer, the southern branch trough was stronger and southward than the normal, and the cold air was weaker. The intensive disturbance in front of southern branch trough was beneficial to the enhancement of southwesterly wind anomaly and the occurrence of negative anomaly of low-level water vapor flux divergence over Hainan Island (especially the big negative anomaly of water vapor flux divergence in the east), which provided water vapor and disturbance transport for winter rainstorms in Hainan.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2021)-05-0759