气候变化领域集成服务门户(CCPortal): Four decades of glacier variations at Muztagh Ata (eastern Pamir): a multi-sensor study including Hexagon KH-9 and Pleiades data

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DOI	10.5194/tc-9-2071-2015
	Four decades of glacier variations at Muztagh Ata (eastern Pamir): a multi-sensor study including Hexagon KH-9 and Pleiades data
	Holzer, N.; Vijay, S.; Yao, T.; Xu, B.; Buchroithner, M.; Bolch, T.
通讯作者	Holzer, N (通讯作者)
发表日期	2015
ISSN	1994-0416
EISSN	1994-0424
起始页码	2071
结束页码	2088
卷号	9 期号:6
英文摘要	Previous in situ measurements have indicated a slight mass gain at Muztagh Ata in the eastern Pamir, contrary to the global trend. We extend these measurements both in space and time by using remote sensing data and present four decades of glacier variations in the entire mountain massif. Geodetic mass balances and area changes were determined at glacier scale from stereo satellite imagery and derived digital elevation models (DEMs). This includes Hexagon KH-9 (year 1973), ALOS-PRISM (2009), Pleiades (2013) and Landsat 7 ETM+ data in conjunction with the SRTM-3 DEM (2000). In addition, surface velocities of Kekesayi Glacier, the largest glacier at Muztagh Ata, were derived from amplitude tracking of TerraSAR-X images (2011). Locally, we observed strong spatial and temporal glacier variations during the last four decades, which were, however, on average not significant for the entire massif. Some south-west-exposed glaciers fluctuated or advanced, while glaciers with other aspects rather experienced continuous shrinkage. Several glaciers such as Kekesayi indicate no measurable change at their frontal position, but clear down-wasting despite mostly thick debris coverage at low altitudes. The surface velocity of this debris-covered glacier reach up to 20 cm per day, but the lowest part of the tongue appears to be stagnant. The low velocity or even stagnancy at the tongue is likely one reason for the down-wasting. On average, the glaciers showed a small, insignificant shrinkage from 274.3 +/- 10.6 km(2) in 1973 to 272.7 +/- 1.0 km(2) in 2013 (-0.02 +/- 0.1% a(-1)). Average mass changes in the range of 0.03 +/- 0.33mw. e. a(-1) (1973-2009) to 0.01 +/- 0.30mw. e. a(-1) (1973-2013) reveal nearly balanced budgets for the last 40 years. Indications of slightly positive rates after 1999 (+0.04 +/- 0.27mw. e. a(-1)) are not significant, but confirmed by measurements in the field.
关键词	DIGITAL ELEVATION MODELS KARAKORAM-HIMALAYA SATELLITE IMAGERY SURFACE VELOCITY STEREO IMAGERY CLIMATE-CHANGE MASS-BALANCE KONGUR SHAN SAR DATA RADAR
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000367523400005
来源期刊	CRYOSPHERE
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/258565
推荐引用方式 GB/T 7714	Holzer, N.,Vijay, S.,Yao, T.,et al. Four decades of glacier variations at Muztagh Ata (eastern Pamir): a multi-sensor study including Hexagon KH-9 and Pleiades data[J]. 中国科学院青藏高原研究所,2015,9(6).
APA	Holzer, N.,Vijay, S.,Yao, T.,Xu, B.,Buchroithner, M.,&Bolch, T..(2015).Four decades of glacier variations at Muztagh Ata (eastern Pamir): a multi-sensor study including Hexagon KH-9 and Pleiades data.CRYOSPHERE,9(6).
MLA	Holzer, N.,et al."Four decades of glacier variations at Muztagh Ata (eastern Pamir): a multi-sensor study including Hexagon KH-9 and Pleiades data".CRYOSPHERE 9.6(2015).