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North China Electric Power University (2021)

Changes of Global Climate Landscape Pattern and Its Impact on Surface Water Resource in Qinghai-Tibet Plateau

管延龙

Titre : Changes of Global Climate Landscape Pattern and Its Impact on Surface Water Resource in Qinghai-Tibet Plateau

Auteur : 管延龙

Grade : Doctoral Dissertation 2021

Université : North China Electric Power University

Résumé partiel
A large number of anthropogenic greenhouse gases dominate the global climate change and have an important impact on nature and human system.Under the background of global warming,except for the polar climate types,the spatial scope of other climate types has basically become a more pronounced expansion trend.However,at present,most of the relevant researches are based on the area-based indicators,and lack of understanding of the spatial heterogeneity of the climate itself,including the unique alpine climate in China.Based on the observation,reanalysis and climate model data of long time series,this research,from the perspective of spatial morphology,organically combines the global climate spatial change with landscape ecological indicators to construct the global climate landscape pattern,and makes in-depth exploration on its structure and function.At the same time,based on the background of the rapid evolution of alpine climate in the Qinghai Tibet Plateau,this paper focuses on exploring the change of surface water resources,understanding its spatial and temporal distribution characteristics and laws,and analyzing the response between the plateau climate and surface water resources.The results of this research mainly include the following 7 aspects :(1)based on the area change of major climate types,SD index was used to characterize the dispersion changes of the major climate types on the global land,and the evaluation system of global climate landscape pattern was constructed,which revealed that there was a clear climatic patch aggregation process at a global scale ;At the same time,the climate diversity decreased obviously during 1950 to 2010.(2)The possible structural changes of global climate landscape pattern under high emission scenarios RCP8.5 were explored.The results showed that during 1901-2095,the patch aggregation effect of landscape pattern in global major climate types increased significantly.The patch aggregation effect appeared in tropical,arid,temperate and continental climates,while fragmentation occurred in polar climate zones ;At the same time,the structure of global climate landscape pattern is changed with a clear latitudinal trend and the spatial distribution of different periods based on standard deviation ellipse tends to aggregate

Mots clés : Climate change ;Water resources ;Climate type ;Climate landscape pattern ;Aggregation;Heterogeneity ;

Présentation (CNKI)

Page publiée le 17 février 2022