Effects Of Climate Warming On Spatial And Temporal Changes Of Snowfall In Heilongjiang Province

In the context of global warming,the response of snowfall indicators to climate warming has received much attention.Heilongjiang is located at the highest latitude in China,and the temperature warming level far exceeds the national level.Therefore,the impact of climate warming on the snowfall indicators in Heilongjiang Province has research significance.This paper uses the daily precipitation data of Heilongjiang Climate Center from 1961 to 2015 and daily temperature data to identify the indicators of snowfall(the first day of snowfall,the day of snowfall,the snowfall,the number of snowfall days,the amount of snowfall,the maximum amount of snowfall,the intensity of snowfall,the snowfall of different grades).The basic spatio-temporal variation characteristics analysis was carried out for the number of days and snowfall.On the basis of this,combined with the temperature data,the influence of temperature on the winter snowfall index in Heilongjiang Province was explored,and the following main research results were obtained:(1)The snowfall in Heilongjiang Province was postponed,the snowfall was advanced,and the snowfall period was shortened.All of them passed the 95%probability level test,and the snowfall period was the most obvious.In the spatial distribution,the snowfall in Heilongjiang Province is early in the morning,the north is early in the south,the snowfall is in the north,the night is in the south,and the snowfall is short in the north and south.The first day,the end of the day,and the snowfall period have certain similarities in spatial variation.The tendency of the western and southwestern regions of Heilongjiang Province is greater than that of the northern and eastern regions.(2)The snowfall,maximum snowfall and snowfall intensity in Heilongjiang Province have increased significantly,and there is also a good consistency in spatial distribution.The Daxinganling,Xiaoxing'anling and the eastern part of the Sanjiang Plain are high-value areas,and the Songnen Plain in the southwest is low.Value area.The amount of snowfall and snowfall increased in the province in terms of spatial propensity,and the trend rate in the Sanjiang Plain was greater than in the west andsouthwest.(3)The snowfall of all levels in Heilongjiang Province is on the rise,but the upward trend of small snow is not significant.Heavy snow and blizzard in the spatial distribution are more in the north and east,less in the southwest;blizzard is the most in the southeast;small snow is less in the west,and the spatial distribution is mainly related to the nature of the underlying surface and the distribution of land and land.In addition to light snow,the number of snowfall days showed a significant upward trend.The number of snowstorm days was more in the southeast,and the number of heavy snow,medium snow and light snow days was more than that of Daxinganling,Xiaoxing'anling and Sanjiang.From the snowfall days and the contribution rate of snowfall,the contribution rate of Xiaoxue is the largest,indicating that the snowfall in Heilongjiang mainly comes from small snow,followed by snow,heavy snow and blizzard.The contribution rate of small snow decreases in time,snow,heavy snow,blizzard and snowfall.The contribution rate of both the number of days and the amount of snowfall increased significantly,and there was a good correlation with the increase in the total amount of snowfall in Heilongjiang Province.(4)Since the 1960 s,the temperature in Heilongjiang Province has increased significantly.In the late 1980 s,the temperature increased significantly,and the rate of increase was 0.427 °C/10 a.The spatial variation in the upper part of the upper Xing'an Mountains was the high temperature increase.(5)In the context of climate warming,there is a good correlation between the snowfall index,the snowfall day,the snowfall period,the number of snowfall days,the snowfall intensity,the number of snowfalls and the annual average temperature in the snowfall indicators in Heilongjiang Province.There is a correlation between the snowfall and the winter temperature..However,the amount of snowfall,the maximum amount of snowfall,the number of blizzards,the amount of blizzards,the number of heavy snowfalls,the amount of heavy snow,the number of snows,and the amount of snow are not sensitive to temperature changes.The temperature rises,the snowfall is delayed,the snowfall is advanced,the snowfall period is shortened,the snowfall days are reduced,the snowfall intensity is increased,the number of snowfalls and the amount of snowfall are reduced,and the snowfall is most obvious during the first day and the snowfall.