Climate characteristics of tornado from 1956 to 2011 in Heilongjiang province
Tornadoes events from 1956 to 201 1 in Heilongjiang province were classified by a Fujitec-Pearson meth-od.Temporal and spatial characteristics of tornadoes were analyzed,and the related large-scale circulation and for-mation mechanism for typical cases were discussed.The results show that there is apparent temporal and spatial distribution for those tornado events from 1956 to 201 1 in Heilongjiang province.The frequency of tornado is high-er during 1960s to 1980s,while it is the lowest in 1990s,and it increases during 2001 to 2011.Most tornadoes oc-cur in summer,especially in July,and most are from afternoon to early evening.Spatial distribution of tornadoes suggests that frequent area of tornadoes is in Suihua of Heilongjiang province,which is related with the local geo-graphical location,climatic conditions and atmospheric circulation.Unstable situation,warm moisture transports and the vertical motion of cold and warm air provide the favorable conditions for generation of tornadoes.
国家科技期刊平台
NSTL
万方数据
维普
