Characteristics of Spatial and Temporal Distribution of Extreme Precipitation in Heilongjiang Province
The spatial and temporal variations of six extreme precipitation indices were analyzed by using climatic propensity,percentile,and correlation analyses with GIS spatial interpolation in Heilongjiang Province from 1991 to 2020,and the correlation between the indices and the annual precipitation was also analyzed.The results show that the RX1day,RX5day,R95 and R99 in Heilongjiang province in the past 30 years are the highest in the Songnen Plain area,and the lowest in the Daxing'anling and Southeast Mountain areas.The six indices show an increasing trend,and the rate of change of R95 is the largest,reaching 30.48 mm/10a(p<0.05).There were spa-tial differences in the changes of the indices,and the spatial changes of RX1day and RX5day were characterized similarly.Significant positive correlations were exhibited between annual precipitation and most of the extreme precipitation indices,with the best correlation between R95 and annual precipitation(p<0.01).The results of this study can provide an important reference for carrying out the ecological risk assessment of extreme precipitation in Heilongjiang Province,which is conducive to improving the meteorological disaster prevention and mitigation and the ability to cope with climate change.
Precipitation extremesSpatial and temporal variabilityHeilongjiang Province
NETL
NSTL
万方数据
维普
