气候变化领域集成服务门户(CCPortal): Investigating the bias of TanDEM-X digital elevation models of glaciers on the Tibetan Plateau: impacting factors and potential effects on geodetic mass-balance measurements

CCPortal

DOI	10.1017/jog.2021.15
	Investigating the bias of TanDEM-X digital elevation models of glaciers on the Tibetan Plateau: impacting factors and potential effects on geodetic mass-balance measurements
	Li, Jia; Li, Zhi-Wei; Hu, Jun; Wu, Li-Xin; Li, Xin; Guo, Lei; Liu, Zhuo; Miao, Ze-Lang; Wang, Wei; Chen, Jun-Li
通讯作者	Li, ZW ; Hu, J (通讯作者)
发表日期	2021
ISSN	0022-1430
EISSN	1727-5652
起始页码	613
结束页码	626
卷号	67 期号:264
英文摘要	The TanDEM-X DEM is a valuable data source for estimating glacier mass balance. However, the accuracy of TanDEM-X elevation over glaciers can be affected by microwave penetration and phase decorrelation. To investigate the bias of TanDEM-X DEMs of glaciers on the Tibetan Plateau, these DEMs were subtracted from SPOT-6 DEMs obtained around the same time at two study sites. The average bias over the studied glacier areas in West Kunlun (175.0 km(2)) was 2.106 +/- 0.012 m in April 2014, and it was 1.523 +/- 0.011 m in Geladandong (228.8 km(2)) in October 2013. By combining backscatter coefficients and interferometric coherence maps, we found surface decorrelation and baseline decorrelation can cause obvious bias in addition to microwave penetration. If the optical/laser data and winter TanDEM-X data were used as new and historic elevation sources for mass-balance measurements over an arbitrary observation period of 10 years, the glacier mass loss rates in West Kunlun and Geladandong would be potentially underestimated by 0.218 +/- 0.016 and 0.158 +/- 0.011 m w.e. a(-1), respectively. The impact is therefore significant, and users should carefully treat the bias of TanDEM-X DEMs when retrieving a geodetic glacier mass balance.
关键词	PENETRATION DEPTH VOLUME CHANGE DECORRELATION RESOLUTION MOUNTAIN STEREO SNOW DEM INTERFEROMETRY TOPOGRAPHY
英文关键词	Decorrelation; elevation bias; glacier mass balance; penetration; TanDEM-X; Tibetan Plateau
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000670030500004
来源期刊	JOURNAL OF GLACIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260187
推荐引用方式 GB/T 7714	Li, Jia,Li, Zhi-Wei,Hu, Jun,et al. Investigating the bias of TanDEM-X digital elevation models of glaciers on the Tibetan Plateau: impacting factors and potential effects on geodetic mass-balance measurements[J]. 中国科学院青藏高原研究所,2021,67(264).
APA	Li, Jia.,Li, Zhi-Wei.,Hu, Jun.,Wu, Li-Xin.,Li, Xin.,...&Chen, Jun-Li.(2021).Investigating the bias of TanDEM-X digital elevation models of glaciers on the Tibetan Plateau: impacting factors and potential effects on geodetic mass-balance measurements.JOURNAL OF GLACIOLOGY,67(264).
MLA	Li, Jia,et al."Investigating the bias of TanDEM-X digital elevation models of glaciers on the Tibetan Plateau: impacting factors and potential effects on geodetic mass-balance measurements".JOURNAL OF GLACIOLOGY 67.264(2021).