利用线性趋势分析和GIS空间插值等方法,对广西喀斯特地区1971-2020年≥35℃高温日数、≥35 ℃有效积温进行分析,初步探究其时空分布规律.结果表明,1971-2020年广西喀斯特地区年平均≥35℃高温日数、≥35℃有效积温均呈上升变化趋势,气候倾向率分别2.8d·(10a)-1、3.5℃·(10a)-1;7-8月高温更为集中.空间分布上,≥35℃高温日数和≥35℃有效积温南北差异明显,呈现西南高、东北低的特点,崇左市为主要的高值区.从高温变化趋势空间分布来看,西南和东北均呈增多变化趋势,崇左市和桂林市增多趋势明显.
In this study,linear trend analysis and GIS spatial interpolation were used to analyze the number of ≥35 ℃ days and ≥35 ℃ effective accumulated temperature from 1971 to 2020 in Guangxi karst region,and to preliminarily investigate their spatial and temporal distribution patterns.The results show that from 1971 to 2020,the annual average number of ≥35 ℃ days and ≥35 ℃ effective accumulated temperature in Guangxi karst region were on an upward trend,with a tendency rate of 2.8 d·(10a)-1 and 3.5 ℃·(10a)-1 respectively,the high temperature in July-August was more concentrated.In terms of spatial distribution,≥35 ℃ days and ≥35 ℃ effective accumulated temperature had a clear north-south differences in characteristics.The absolute multi-year mean of high temperatures showed a characteristic of high in the southwest and low in the northeast,and Chongzuo City was the main high-value area.In terms of the amplitude of high temperature changes,both the southwest and the northeast showed an increasing trend,while the high temperature changes in Chongzuo City and Guilin City were more obvious.