Analysis on Temporal and Spatial Variation Characteristics of Air Temperature in the South Slope of Qilian Mountains and Its Nearby Regions During the Period From 1960 to 2014
Based on air temperature data observed in 19 meteorological stations in the south slope of Qilian Mountains and its nearby regions from 1960 to 2014,the methods of linear regression,correlation analysis, polynomial trend,moving mean,Hurst index and ArcGIS were used to analyze the temporal variability and spatial distribution of air temperature. The results are as follows. (1) The mean annual air temperature,the minimum and the maximum temperature exhibited unanimously fluctuating increasing trend with the rates of 0.35℃/decade,0.27℃/decade,0.47℃/decade,respectively. (2) The variation trend of seasonal mean temperature, the maximum and the minimum temperature showed an upward trend,and the most significant increase occurred in winter. (3) From the point of view on the inter-decadal mean temperature,the maximum and the minimum temperature variation,the trend of temperature rise in 20002014 was lower than that of 19901999,which did not mean that global warming had stagnated,was caused by external force of nature. (4) The Hurst index of air temperature was 0.5