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近50年黔东南浅层地温时空变化特征分析 被引量:11

On Temporal and Spatial Characteristics of Shallow Geothermal in Southeast Guizhou in the Past Fifty Years
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摘要 利用黔东南地区16个地面气象观测站1961—2010年逐月地面0~20cm浅层地温实测资料,分别统计四季浅层地温的时间序列,采用正交函数分解(EOF)、小波分析,Mann-Kendall突变检验、经验模态分解(EMD)趋势等方法,分析各季浅层地温的空间分布结构和时间演变特征.结果表明,黔东南各季浅层地温均为正值,表明浅层地温高于0℃以上,但各季节的时空分布存在较大差异,其中夏季最大,冬季最小;在大尺度气候异常和地形等影响下,各季变化大值中心分布不同,次区域特征存在明显差异;同时各季表现出显著年代振荡特征,振幅强度均在2000年以后达到最强,四季振荡周期各自不尽相同,但四季浅层地温近50年来均为增温趋势. The time series of the shallow geothermal has been calculated respectively in four seasons with observed monthly data of 0-20 cm geothermal from 1961 to 2010 at 16 stations in Southeast Guizhou.And their spatial distribution and time changing tendency have been analyzed by means of Orthogonal Function Decomposition(EOF),Empirical Mode Decomposition(EMD),wavelet analysis and Mann-Kendall methods.The results indicate that the shallow geothermal is positive in each season,in other words,the shallow geothermal is always above 0℃.But there are big differences in spatial and temporal distractions,with the highest in summer and the lowest in winter.Affected by large-scale climate anomalies and topography,the distributions of the maximum temperature centers are different in each season and the sub-region characteristics possess obvious differences.At the same time,the shallow geothermal in each season shows remarkable annual oscillating characteristics,the intensity of which will reach their top in 2000.Though their oscillating periods are different,the shallow geothermal in four seasons presents warming tendency.
出处 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第11期54-58,共5页 Journal of Southwest China Normal University(Natural Science Edition)
基金 贵州省科学技术基金项目[2009]2043
关键词 黔东南地区 浅层地温 EOF分析 EMD分析 Southeast Guizhou Shallow geothermal EOF analysis EMD analysis
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