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Accelerated glacier mass loss in the southeastern Tibetan Plateau since the 1970s

Advances in Climate Change Research 2023年第3期14卷 372-386页

作者： Lan-Hua LUO Chang-Qing KE Yu-Bin FAN Zi-Fei WANG Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural ResourcesSchool of Geography and Ocean ScienceNanjing UniversityNanjing 210023China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing 210023China Collaborative Innovation Center of South China Sea Studies Nanjing 210023China

The southeastern Tibetan Plateau(SETP)is a region in High Mountain Asia with the most serious glacier mass loss.However,long-term and large regional-scale studies that estimate glacier mass balance in this area remain limited.In this study,we generated a KH-9 Digital Elevation Model(DEM)(covering 87.6%of the glacier area)for the 1970s from KH-9 Hexagon imagery and quantified geodetic glacier mass over the SETP from the 1970s to 2020 using KH-9 DEM,nasadem and ICESat-2 ATL06 data.The results show that the SETP was in a state of serious mass loss(at a rate of−0.35±0.03 m w.***.per year)from the 1970s to 2020,and the rate of mass loss accelerated from−0.15±0.05 to−0.56±0.10 m w.***.per year between the 1970s–2000 and 2000–2020.Within the SETP,the glacier mass balance revealed a remarkable spatial heterogeneity.The maximum mean glacier mass loss rate was observed in the Hengduan Shan.Nyainqentanglha exhibited the highest acceleration in the mass loss rate since the 1970s.The warming of air temperature and decreasing snowfall can partly explain the accelerated glacier mass loss in the SETP.The study provides a new long-term glacier mass balance estimation covering almost the entire SETP that suggests the acceleration in glacier mass loss observed in the SETP since the 1970s is a regional tendency,which is crucial for understanding the relationship between glaciers and climate changes.

关键词： Glacier mass balance KH-9 hexagon imagery nasadem ICESat-2 Southeastern Tibetan Plateau

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Global DEMs vary from one to another:an evaluation of newly released Copernicus,NASA and AW3D30 DEM on selected terrains of China using ICESat-2 altimetry data

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International Journal of Digital Earth 2022年第1期15卷 1149-1168页

作者： Hui Li Jiayang Zhao Bingqi Yan Linwei Yue Lunche Wang Hunan Key Laboratory of Remote Sensing of Ecological Environment in Dongting Lake Area School of Geography and Information EngineeringChina University of GeosciencesWuhanPeople’s Republic of China Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhanPeople’s Republic of China Hubei Key Laboratory of Critical Zone Evolution School of Geography and Information EngineeringChina University of GeosciencesWuhanPeople’s Republic of China

A good understanding of the quality of digital elevation model(DEM)is a perquisite for various applications.This study investigates the accuracy of three most recently released 1-arcsec global DEMs(GDEMs,Copernicus,NASA and AW3D30)in five selected terrains of China,using more than 240,000 high-quality ICESat-2(Ice,Cloud and land Elevation Satellite)ALT08 points.The results indicate the three GDEMs have similar overall vertical accuracy,with RMSE of 6.73(Copernicus),6.59(NASA)and 6.63 m(AW3D30).While the accuracy varies considerably over study areas and among GDEMs.The results show a clear correlation between the accuracy and terrain slopes,and some relationship between the accuracy and land covers.Our analysis reveals the land cover exerts a greater impact on the accuracy than that of the terrain slope for the study area.Visual inspections of terrain representation indicate Copernicus DEM exhibits the greatest detail of terrain,followed by AW3D30,and then by nasadem.This study has demonstrated that ICESat-2 altimetry offers an important tool for DEM assessment.The findings provide a timely and comprehensive understanding of the quality of newly released GDEMs,which are informative for the selection of suitable DEMs,and for the improvement of GDEM in future studies.

关键词： Copernicus DEM nasadem AW3D30 DEM vertical accuracy terrain representation ICESat-2 altimetry

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nasadem和ASTER GDEM V3数据精度比较——以大连市市内区域为例

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科技创新与应用 2021年第14期11卷 1-7,13页

作者：王一泽王利何飞辽宁师范大学地理科学学院辽宁大连116029

nasadem以及ASTER GDEM V3是DEM产品中精度较高,质量较好,覆盖范围较广的DEM产品。但两类数据在整体上的误差判定以及在不同高程、坡度的误差特征并不相同,而对于二者误差精度的比较以及分析对于数字高程模型乃至于整个地理学课的研究... 详细信息

nasadem以及ASTER GDEM V3是DEM产品中精度较高,质量较好,覆盖范围较广的DEM产品。但两类数据在整体上的误差判定以及在不同高程、坡度的误差特征并不相同,而对于二者误差精度的比较以及分析对于数字高程模型乃至于整个地理学课的研究具有重要意义。自全球主要DEM产品诸如SRTM、ASTER GDEM V1正式面世,关于各类各版本DEM产品的精度比较以及研究一直是数字高程模型研究的重要领域之一。但在海岸带地区的精度验证缺乏合适的方法,传统的精度验证方法缺乏可信度,可靠性差。所以文章以大连市市内地区为研究区域,借助研究区的高程验证点数据对nasadem和ASTER GDEM V3数据进行精度比较和评估。分析得出,从整体来看,nasadem产品在误差方面远低于ASTER GDEM V3,两类数据误差均呈现正态散布,其中nasadem误差分布相较于ASTER GDEM V3更加集中。随着坡度或实际海拔高程值的递增,两类数据的误差也持续增加,海拔及坡度对ASTER GDEM V3数据影响较大。

关键词： nasadem ASTER GDEM V3 精度坡度海拔高程大连市

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