Gale Days in East of Hexi Corridor: Spatial-Temporal Distribution and Effect on Sand-Dust Weather
To reveal the spatial-temporal evolution of gale days and its effect on sand-dust weather,and mitigate the wind and sand disasters,based on the data of gale,sandstorm and blowing sand from 4 meteorological stations in east of Hexi corridor from 1971 to 2010,the spatial-temporal evolution of gale days and the relationships between gale days and sandstorm,blowing sand days were analyzed.The results showed that:the annual gale days decreased significantly with a rate of 10.77 d/10 a in east of Hexi corridor in recent 40 years,so were the seasonal gale days and the decline rate was the largest in summer and was the smallest in winter;the annual and seasonal gale days showed a decreasing trend with the increase of age;the gale days was the most in spring and was the least in autumn,and the maximum occurred in April and the minimum appeared in September;the spatial distribution of gale days was related to altitude and topography,the gale days were the most in high altitude mountain,more in northern desert area and shallow mountain area,and the least in oasis plain;the annual sandstorm and blowing sand days decreased significantly in east of Hexi corridor in recent 40 years;the annual sandstorm and blowing sand days had significantly positive correlations with annual gale days,and the correlation coefficients were 0.878 and 0.888 respectively;the variation of gale days had a remarkably positive effect on the variation of sand-dust days with time,and the decrease of gale days might be one of the main reasons for the decrease of sand-dust days.
gale daysspatial-temporal evolutionsand-dust weathercorrelation analysiseast of Hexi corridor
NETL
NSTL
万方数据
维普
