Spatiotemporal Variation Characteristics and Regional Processes Evaluation of Heavy Snowstorms in Tongliao
Based on the meteorological data of Tongliao from 1960 to 2020,the spatial and temporal characteristics of heavy snowfall stations and regional processes were analyzed,and the regional heavy snowfall was quantitatively evaluated by referring to the method of evaluating regional heavy rainfall process.The results showed that:(1)The extreme values of snowstorm in the north were obviously smaller than those in the south,while the number of stations occurred snowstorms was more in the north and south,and less in the central.The average number of heavy snow days per year was 0.46 days.The total number of heavy snow happened in those stations in Tongliao was 285.November and March were the months heavy snow happened most,and January to February was least.Heavy snow mainly appeared in late March,with a total of 39 stations,and showed an increasing trend year by year.(2)There were 58 regional heavy snowfall processes,83％of which lasted only 1 day,and the regional processes mainly occurred in March and April.(3)According to the snowfall intensity(precipitation and snow depth),range and duration,the evaluation was carried out and the result showed that there were three extremely strong regional snowstorm processes.Combined with local situation,the regional processes could be divided according to the comprehensive intensity X value.The processes with X value above 48 were the extra-strong regional heavy snow processes,above 28 were the strong regional processes,and above 18 were the less-strong regional processes.This method was suitable for evaluating snowstorm intensity.
Heavy snowRegional processSpatial-temporal distribution characteristicsQuantitative evaluation
万方数据
维普
