贵州省地表反照率变化及其对气候变化的响应  

Changes in albedo of Guizhou Province and its Response to Climate Change

作　　者：尹霞 刘绥华[1,2] Yin Xia;Liu Suihua(College of Geography and Environmental Science,Guizhou Normal University,Guiyang,Guizhou 550025,China;KeyLaboratory of Remote Sensing Application on Mountain Resources and Environment of Guizhou Province,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州师范大学地理与环境科学学院,贵州贵阳550025 [2]贵州省山地资源与环境遥感应用重点实验室,贵州贵阳550025

出　　处：《绿色科技》2024年第10期78-85,92,共9页Journal of Green Science and Technology

基　　金：国家自然科学基金项目(编号:42161029)。

摘　　要：在全球气候变化背景下,地表反照率作为地表辐射平衡和气候研究的重要参数之一,在低纬度喀斯特地区开展地表反照率变化对气候要素的响应研究对理解低纬度喀斯特地区地表反照率的气候效应和区域生态环境保护具有重要意义。以贵州省为例,基于MCD43A3反照率数据、MOD15A2H LAI数据、气温和降水数据,使用Theil-Sen斜率估计和Mann-Kendall趋势检验分析、偏相关分析、滞后相关系数分析法,分析了贵州省地表反照率时空变化特征及与气候要素的时滞效应。结果表明:①贵州省2001-2022年地表反照率整体偏低,年际变化呈缓慢波动上升,年内变化呈先上升后下降;不同季节平均地表反照率比较为夏>秋>春>冬,年际变化趋势在空间上呈西升东降,在时间上为春夏上升,秋冬下降;②夏季地表反照率变化与温度、降水、叶面积指数(LAI)正负相关共存,温度对地表反照率负相关面积较大,降水和LAI则与温度相反,贵州西部毕节地区地表反照率对气候变化更为敏感;③在夏季地表反照率与温度、降水、LAI的响应中,贵州省80%以上区域表现出时滞效应。Against the backdrop of global climate change,surface albedo,as one of the critical parameters for surface radiation balance and climate research,holds significant importance in studying the response of surface albedo changes to climatic factors in low-latitude karst regions.This understanding is crucial for comprehending the climatic effects of surface albedo in karst areas and protecting regional ecological environments.Taking Guizhou Province as an example,this study analyzes the spatiotemporal variation characteristics of surface albedo and its time-lagged effects on climatic factors based on MCD43A3 albedo data,MOD15A2H LAI data,temperature,and precipitation data.Methods such as Theil-Sen slope estimation,Mann-Kendall trend test analysis,partial correlation analysis,and lagged correlation coefficient analysis were employed.The results indicate that:①From^(2) 001 to 2022,the overall surface albedo in Guizhou Province was relatively low,exhibiting a slow and fluctuating upward trend on an inter-annual scale and a pattern of first increasing and then decreasing within the year.The average surface albedo for different seasons followed the order of summer>autumn>spring>winter.Spatially,the inter-annual trend showed an increase in the west and a decrease in the east,while temporally,it increased in spring and summer and decreased in autumn and winter.②The variation of summer surface albedo was associated with both positive and negative correlations with temperature,precipitation,and LAI.Temperature exhibited a larger negative correlation area with surface albedo,while precipitation and LAI showed opposite patterns.The Bijie region in western Guizhou was particularly sensitive to climate change in terms of surface albedo.③Over 80%of Guizhou Province exhibited time-lagged effects between summer surface albedo and temperature,precipitation,and LAI.

关 键 词：气候变化 地表反照率 时空变化 滞后效应 

分 类 号：P467[天文地球—大气科学及气象学]