摘要:
利用MODIS大气可降水量产品和高程数据,采用描述性统计和空间自相关分析方法,定量分析了2003-2013年间天山山区大气可降水量的空间聚集特征.结果表明,近10 a天山山区平均大气可降水量的空间分布格局呈现西多东少的变化,全局空间自相关系数为0.899 8,具有典型的空间聚集模式,即:高值聚集区域占山区总面积的35.94%,集中在高程为2000m左右的天山山区周边地区;低值聚集区域占山区总面积的38.79%,主要分布在高程3000m以上的中天山和东天山地区;没有高低负相关,仅有较少的低高负相关的聚集方式,占山区总面积的0.05%,只在天山山区周边零星分布.高程与天山山区大气可降水量的空间相关系数为-0.831 3,是空间聚集格局分布与差异的主要原因.
Abstract:
Based on the MODIS near infrared atmospheric precipitable water products with the resolution of 1 km × l km and elevation data,using GIS spatial analyst and mathematical statistics method,this paper analyzed the spatial distribution and spatial correlation of atmospheric precipitable water in the Tianshan mountains during the period from 2003 to 2013.The results show that the atmospheric precipitable water in western mountain area is higher than the eastern mountain area.The atmospheric precipitable water in the Tianshan mountains has significantly positively correlated and its global spatial autocorrelation index is 0.899 8.The atmospheric precipitable water in the Tianshan mountains tends to be spatially clustered.The cluster of high values (HH) accounts for 35.94% of the total and are mostly distributed in elevation 2 000 m in surrounding area of Tianshan mountains.The cluster of low values (LL) accounts for 38.79% of the total and concentrated in the central and eastern region of the Tianshan mountains with elevation 3 000 m.The spatial outliers in which a low value is surrounded primarily by high values (LH) are scattered in the Tianshan Mountain.The spatial correlation coefficient between atmospheric precipitable water and elevation is-0.831 3.Elevation is the main reason for the distribution and difference of spatial clustering pattern.
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