1.南京信息工程大学 大气科学学院;2.南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心;3.①南京信息工程大学 大气科学学院;4.②南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心
1.Nanjing University of Information Science &2.Technology
This study is mainly used daily temperature and precipitation data from 753 stations during 1950-2018 provided by the China National Meteorological Information Center and NCEP/NCAR reanalysis data, to research strong persistent frozen rain and snow events in south of China in winter from 1951 to 2018 and analyze the spatial-temporal feature, regionalism, atmosphere facto of strong events. The result of study illustrated that: 1) The strong persistent frozen rain and snow events in southern china have a significant 2-3 years periodic variation and there was a mutation around 1985, although it was showed a decrease trend during the whole period, there were still several strong events happened in this years. 2) Persistent frozen rain and snow events occur more frequently and longer continued days in the central and western parts of South China, while the intensity is stronger in the central and eastern parts of South China than that in other area in South China. 3) 37 strong persistent frozen rain and snow events in south China could be divided into three types: southwest china type events, central china type events, south china type events. all the three types of events, the northern upper air shows the anomalous geopotropic height of the Eurasian continent with high in north and low in south. The low-altitude Mongolia high is significantly stronger than the average and the center moves southward. This configuration is conducive to the transmission of cold air from the north to the south. The southern support trough was significantly deepener and the water vapor transported to the north was active. The three types are different in intensity and influence range of Mongolian high pressure, the southwest type is the strongest, the range is the largest, and the extend to south area significantly, followed by the South type. The transport of central and South China type water vapor is influenced by the south trough and subtropical high, while the southwest type event water vapor is only controlled by the South trough. Above conclusions can provide reference for the research on the precursor signals of persistent frozen rain and snow events in South of China.
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