摘要
饱和水汽压差(VPD)是表示区域大气干燥程度的重要指标,分析贵州省VPD时空变化特征及其影响机制对明晰气候变化规律和农业生产具有重要意义。研究基于中国气象局提供的CN05.1格点化观测数据集,量化并分析了1961—2022年贵州省喀斯特区域和非喀斯特区域VPD及其时空变化特征,采用多元线性回归方法识别了影响VPD变化的主要气象要素并分析了基于VPD的干旱危险性。结果发现:贵州省年际和季节尺度VPD存在显著的升高趋势,其中喀斯特区域和非喀斯特区域春季和夏季VPD空间分布和变化趋势均呈现相反的格局;以VPD为指标的贵州省干旱危险性显著升高,非喀斯特区域速率更快;气温和相对湿度是贵州省年际和季节尺度上VPD变化的主导气象要素,不同区域年和季节尺度上不同气象要素的贡献率稍有差异。
Vapor pressure deficit(VPD)is an important indicator of regional atmospheric dryness,analyzing the characteristics of spatial and temporal variations of VPD and its influence mechanism in Guizhou Province is of great significance in clarifying the change rule of climate and agricultural production.Based on the CN05.1 gridded observational dataset,this study quantified the temporal and spatial variations of the VPD in karst and non-karst regions of Guizhou Province from 1961 to 2022 by using regression analysis methods,and analyzed the VPD-based drought hazard and the meteorological factors which influencing VPD changes.The results revealed a significant upward trend in VPD on an annual and seasonal scale in Guizhou Province.The spatial distribution and trend of VPD during spring and summer showed opposite patterns between the karst and non-karst regions.Taking VPD as the index,the drought hazard increased significantly in Guizhou Province,with a faster rate observed in the non-karst region.Temperature and relative humidity were identified as the dominant meteorological factors influencing VPD changes at annual and seasonal scales,with slight differences in the contribution rates of different meteorological factors across various regions and scales.
作者
高江波
黄奉献
刘路路
GAO Jiangbo;HUANG Fengxian;LIU Lulu(Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《贵州师范大学学报（自然科学版）》
CAS
北大核心
2024年第5期39-46,共8页
Journal of Guizhou Normal University：Natural Sciences
基金
国家自然科学基金项目(42371117,42101311)。
关键词
饱和水汽压差
贵州省
喀斯特
干旱
危险性
vapor pressure deficit
Guizhou Province
karst
drought
hazard
